TC647BEUA中文资料_数据手册_规格书

TC647

M

PWM Fan Speed Controller with FanSense^™Technology

Features

Package Types

SOIC/PDIP/MSOP

• Temperature Proportional Fan Speed for Acoustic

Control and Longer Fan Life

V

1

V

8

7

6

5

• Efficient PWM Fan Drive

IN

DD

• 3.0V to 5.5V Supply Range:

- Fan Voltage Independent of TC647

Supply Voltage

C

2

3

4

F

OUT

TC647

V

MIN

FAULT

SENSE

- Supports any Fan Voltage

GND

• FanSense™ Technology Fault Detection Circuits

Protect Against Fan Failure and Aid System

Testing

• Shutdown Mode for "Green" Systems

• Supports Low Cost NTC/PTC Thermistors

• Space Saving 8-Pin MSOP Package

General Description

The TC647 is a switch mode, fan speed controller for

use with brushless DC fans. Temperature proportional

speed control is accomplished using pulse width mod-

ulation (PWM). A thermistor (or other voltage output

Applications

• Power Supplies

• Personal Computers

• File Servers

• Telecom Equipment

• UPSs, Power Amps

• General Purpose Fan Speed Control

temperature sensor) connected to V furnishes the

IN

required control voltage of 1.25V to 2.65V (typical) for

0% to 100% PWM duty cycle. Minimum fan speed is

set by a simple resistor divider on the V

input. An

MIN

integrated Start-up Timer ensures reliable motor start-

up at turn-on, coming out of shutdown mode or

following a transient fault. A logic low applied to V

(Pin 3) causes fan shutdown.

MIN

The TC647 also features Microchip Technology's pro-

prietary FanSense™ technology for increasing system

reliability. In normal fan operation, a pulse train is

present at SENSE (Pin 5). A missing pulse detector

monitors this pin during fan operation. A stalled, open

or unconnected fan causes the TC647 to trigger its

Start-up Timer once. If the fault persists, the FAULT

output goes low and the device is latched in its shut-

down mode.

Available Tools

• Fan Controller Demonstration Board (TC642DEMO)

• Fan Controller Evaluation Kit (TC642EV)

The TC647 is available in the 8-pin plastic DIP, SOIC

and MSOP packages and is available in the industrial

and extended commercial temperature ranges.

2002 Microchip Technology Inc.

DS21447C-page 1

TC647

Functional Block Diagram

V

IN

–

V

DD

+

SHDN

–

+

Control

Logic

V

OUT

C

F

3 x T

Timer

PWM

Clock

Generator

FAULT

Start-up

Timer

V

+

MIN

V

SHDN

–

Missing

Pulse

Detect.

TC647

+

–

10kΩ

SENSE

GND

70mV (typ.)

DS21447C-page 2

2002 Microchip Technology Inc.

TC647

*Stresses above those listed under "Absolute Maximum Rat-

ings" may cause permanent damage to the device. These are

stress ratings only and functional operation of the device at

these or any other conditions above those indicated in the

operation sections of the specifications is not implied. Expo-

sure to absolute maximum rating conditions for extended peri-

ods may affect device reliability.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage ......................................................... 6V

Input Voltage, Any Pin.... (GND – 0.3V) to (V +0.3V)

DD

Package Thermal Resistance:

PDIP (R ).............................................125°C/W

θJA

SOIC (R ) ............................................155°C/W

θJA

MSOP (R ) ..........................................200°C/W

θJA

Specified Temperature Range ........... -40°C to +125°C

Storage Temperature Range.............. -65°C to +150°C

DC ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Unless otherwise specified, T_MIN< T_A< T_MAX, V_DD= 3.0V to 5.5V.

Symbol

Parameter

Supply Voltage

Supply Current, Operating

Min

Typ

Max

Units

Test Conditions

V_DD

I_DD

3.0

—

0.5

5.5

1

V

mA

Pins 6, 7 Open,

C_F= 1 µF, V_IN= V_C(MAX)

I_DD(SHDN)

Supply Current,

Shutdown Mode

V_IN, V_MINInput Leakage

—

25

—

µA

Pins 6, 7 Open,

C_F= 1 µF, V_MIN= 0.35V

I_IN

– 1.0

+1.0

Note 1

V_OUTOutput

t_R

t_F

t_SHDN

V_OUTRise Time

V_OUTFall Time

Pulse Width (On V_MIN) to Clear

Fault Mode

—

30

—

50

—

µsec

I_OH= 5 mA, Note 1

I_OL= 1 mA, Note 1

V_SHDN, V_HYST

Specifications, Note 1

I_OL

I_OH

Sink Current at V_OUTOutput

Source Current at V_OUTOutput

1.0

5.0

—

mA

V_OL= 10% of V_DD

V_OH= 80% of V_DD

V_IN, V_MINInputs

V_C(MAX)

Input Voltage at V_INor V_MINfor

100% PWM Duty Cycle

2.5

2.65

2.8

V

V_C(SPAN)

V_SHDN

V_C(MAX)- V_C(MIN)

Voltage Applied to V_MINto

Ensure Shutdown Mode

1.3

—

1.4

—

1.5

V_DDx 0.13

V

V_REL

Voltage Applied to V_MINto

Release Shutdown Mode

V_DDx 0.19

—

V

V_DD= 5V

Pulse Width Modulator

F_PWM

PWM Frequency

26

50

30

70

34

90

Hz

C_F= 1.0 µF

SENSE Input

V_TH(SENSE)

SENSE Input Threshold

Voltage with Respect to GND

mV

Note 1

FAULT Output

V_OL

t_MP

t_STARTUP

t_DIAG

Output Low Voltage

Missing Pulse Detector Timer

Start-up Timer

—

0.3

—

V

I_OL= 2.5 mA

32/F

3/F

Sec

Diagnostic Timer

—

Note 1: Ensured by design, not tested.

2002 Microchip Technology Inc.

DS21447C-page 3

TC647

2.3

Analog Input (V

)

2.0

PIN DESCRIPTIONS

MIN

An external resistor divider connected to the V

input

The descriptions of the pins are listed in Table 2-1.

MIN

sets the minimum fan speed by fixing the minimum

PWM duty cycle (1.25V to 2.65V = 0% to 100%, typi-

TABLE 2-1:

Pin No. Symbol

PIN FUNCTION TABLE

Description

Analog Input

cal). The TC647 enters shutdown mode when V

≤

MIN

V

. During shutdown, the FAULT output is inactive

SHDN

and supply current falls to 25 µA (typical). The TC647

exits shutdown mode when ≥ V . See

Section 5.0, “Typical Applications”, for more details.

1

2

3

4

5

6

7

8

V

IN

V

MIN

REL

C

Analog Output

Analog Input

F

V

MIN

GND

Ground Terminal

2.4

Ground (GND)

SENSE Analog Input

FAULT Digital (Open Collector) Output

GND denotes the ground terminal.

2.5

Analog Input (SENSE)

V

Digital Output

OUT

V

Power Supply Input

Pulses are detected at the SENSE pin as fan rotation

chops the current through a sense resistor. The

absence of pulses indicates a fault.

DD

2.1

Analog Input (V )

IN

The thermistor network (or other temperature sensor)

2.6

Digital Output (FAULT)

connects to the V input. A voltage range of 1.25V to

IN

2.65V (typical) on this pin drives an active duty cycle of

The FAULT line goes low to indicate a fault condition.

When FAULT goes low due to a fan fault condition, the

device is latched in shutdown mode until deliberately

cleared or until power is cycled. FAULT may be con-

0% to 100% on the V

pin.

OUT

2.2

Analog Output (C )

F

nected to V

if a hard shutdown is desired.

MIN

C is the positive terminal for the PWM ramp generator

F

timing capacitor. The recommended C is 1 µF for

F

2.7

Digital Output (V

)

OUT

is an active high complimentary output that drives

30 Hz PWM operation.

V

OUT

the base of an external NPN transistor (via an appropri-

ate base resistor) or the gate of an N-channel MOS-

FET. This output has asymmetrical drive (see

Section 1.0, “Electrical Characteristics”).

2.8

Power Supply Input (V

)

DD

may be independent of the fan’s power supply

V

DD

(see Section 1.0, “Electrical Characteristics”).

DS21447C-page 4

2002 Microchip Technology Inc.

TC647

3.0

3.1

DETAILED DESCRIPTION

PWM

CAUTION: Shutdown mode is unconditional. That is,

the fan will not be activated regardless of the voltage

at V . The fan should not be shut down until all heat

IN

producing activity in the system is at a negligible

level.

The PWM circuit consists of a ramp generator and

threshold detector. The frequency of the PWM is deter-

mined by the value of the capacitor connected to the C

F

3.5

SENSE Input

input.

A

frequency of 30 Hz is recommended

(FanSense^™Technology)

(C = 1 µF). The PWM is also the time base for the

F

Start-up Timer (see Section 3.3, “Start-Up Timer”). The

PWM voltage control range is 1.25V to 2.65V (typical)

for 0% to 100% output duty cycle.

The SENSE input (Pin 5) is connected to a low value

current sensing resistor in the ground return leg of the

fan circuit. During normal fan operation, commutation

occurs as each pole of the fan is energized. This

causes brief interruptions in the fan current, seen as

pulses across the sense resistor. If the device is not in

shutdown mode, and pulses are not appearing at the

SENSE input, a fault exists.

3.2

The V

V_OUTOutput

pin is designed to drive a low cost transistor

OUT

or MOSFET as the low side power switching element in

the system. Various examples of driver circuits will be

shown throughout this data sheet. This output has an

asymmetric complimentary drive and is optimized for

driving NPN transistors or N-channel MOSFETs. Since

the system relies on PWM rather than linear control,

the power dissipation in the power switch is kept to a

minimum. Generally, very small devices (TO-92 or SOT

packages) will suffice.

The short, rapid change in fan current (high dI/dt)

causes a corresponding dV/dt across the sense

resistor,

R

.

The waveform on

R

is

SENSE

differentiated and converted to a logic-level, pulse-train

by C

and the internal signal processing circuitry.

SENSE

The presence and frequency of this pulse-train is a

direct indication of fan operation. See Section 5.0,

“Typical Applications”, for more details.

3.3

Start-Up Timer

3.6

FAULT Output

To ensure reliable fan start-up, the Start-up Timer turns

the V

output on for 32 cycles of the PWM whenever

Pulses appearing at SENSE due to the PWM turning

on are blanked with the remaining pulses being filtered

by a missing pulse detector. If consecutive pulses are

OUT

the fan is started from the off state. This occurs at

power up and when coming out of shutdown mode. If

the PWM frequency is 30 Hz (C = 1 µF), the resulting

not detected for 32 PWM cycles ( 1 Sec if C = 1 µF),

F

OUT

start-up time will be approximately one second. If a

fault is detected, the Diagnostic Timer is triggered

once, followed by the Start-up Timer. If the fault

persists, the device is shut down (see Section 3.6,

“FAULT Output”).

the Diagnostic Timer is activated and V

is driven

high continuously for three PWM cycles ( 100 msec if

C = 1 µF). If a pulse is not detected within this window,

F

the Start-up Timer is triggered (see Section 3.3, “Start-

Up Timer”). This should clear a transient fault condition.

If the missing pulse detector times out again, the PWM

is stopped and FAULT goes low. When FAULT is

activated due to this condition, the device is latched in

shutdown mode and will remain off indefinitely.

3.4

Shutdown Control (Optional)

If V

(Pin 3) is pulled below V

, the TC647 will go

MIN

SHDN

into shutdown mode. This can be accomplished by

driving V with an open-drain logic signal or using an

MIN

Note: At this point, action must be taken to restart

external transistor, as shown in Figure 3-1. All functions

are suspended until the voltage on V becomes

the fan by momentarily pulling V

SHDN

below

MIN

V

, or cycling system power. In either

higher than V

(0.85V @ V

= 5.0V). Pulling V

DD MIN

REL

case, the fan cannot remain disabled due

to a fault condition as severe system dam-

age could result. If the fan cannot be

restarted, the system should be shut down.

below V

will always result in complete device

SHDN

shutdown and reset. The FAULT output is

unconditionally inactive in shutdown mode.

A small amount of hysteresis, typically one percent of

The TC647 may be configured to continuously attempt

fan restarts, if so desired.

V

(50 mV at V = 5.0V), is designed into the V

/

SHDN

DD

REL

DD

threshold. The levels specified for V

and

SHDN

in Section 1.0, “Electrical Characteristics”,

include this hysteresis plus adequate margin to

account for normal variations in the absolute value of

the threshold and hysteresis.

2002 Microchip Technology Inc.

DS21447C-page 5

TC647

Continuous restart mode is enabled by connecting the

condition. Normal fan start-up is then attempted as pre-

viously described. The FAULT output may be

connected to external logic (or the interrupt input of a

microcontroller) to shut the TC647 down if multiple fault

pulses are detected at approximately one second

intervals.

FAULT output to V

through a 0.1 µF capacitor, as

MIN

shown in Figure 3-1. When so connected, the TC647

automatically attempts to restart the fan whenever a

fault condition occurs. When the FAULT output is

driven low, the V

SHDN

input is momentarily pulled below

MIN

V

, initiating a reset and clearing the fault

+5V

10 kΩ

C

1

+5V

8

0.01µF

+12V

1 kΩ

C

1µF

TC647

RESET

B

Fan

From

Temp

Sensor

1

V

DD

6

V

1

0

IN

FAULT

Q

1

+5V

Fault

Detected

R

BASE

TC647

R

3

7

5

V

OUT

3

2

V

MIN

C

B

SENSE

R

1

0.01 µF

From

System

C

SENSE

Q

2

C

F

R

SENSE

R

4

C

F

Shutdown

Controller

GND

4

(Optional)

1 µF

Note: The parallel combination of R and R must be >10 kΩ.

3

4

FIGURE 3-1:

Fan Fault Output Circuit.

DS21447C-page 6

2002 Microchip Technology Inc.

TC647

4.3

Fan Fault

4.0

SYSTEM BEHAVIOR

Fan Fault is an infinite loop wherein the TC647 is

The flowcharts describing the TC647’s behavioral

algorithm are shown in Figure 4-1. They can be

summarized as follows:

latched in shutdown mode. This mode can only be

released by a reset (i.e., V

SHDN

being brought below

MIN

V

, then above V

, or by power cycling).

REL

4.1

Power-Up

(1) While in this state, FAULT is latched on (low) and

the V output is disabled.

OUT

(1) Assuming the device is not being held in shutdown

mode (V > V )…

(2) A reset sequence applied to the V

the loop to Power-up.

pin will exit

MIN

REL

MIN

(2) Turn V

output on for 32 cycles of the PWM

OUT

clock. This ensures that the fan will start from a

dead stop.

(3) End.

(3) During this Start-up Timer, if a fan pulse is

detected, branch to Normal Operation; if none are

received…

(4) Activate the 32-cycle Start-up Timer one more time

and look for fan pulse; if a fan pulse is detected,

proceed to Normal Operation; if none are

received…

(5) Proceed to Fan Fault.

(6) End.

4.2

Normal Operation

Normal Operation is an endless loop which may only

be exited by entering shutdown mode or Fan Fault. The

loop can be thought of as executing at the frequency of

the oscillator and PWM.

(1) Reset the missing pulse detector.

(2) Is TC647 in shutdown? If so…

a. V

duty cycle goes to zero.

OUT

b. FAULT is disabled.

c. Exit the loop and wait for V

> V

to resume

REL

MIN

operation (indistinguishable from Power-up).

(3) Drive V

to a duty cycle proportional to greater

OUT

of V and V

on a cycle by cycle basis.

MIN

IN

(4) If a fan pulse is detected, branch back to the start

of the loop (1).

(5) If the missing pulse detector times out …

(6) Activate the 3-cycle Diagnostic Timer and look for

pulses; if a fan pulse is detected, branch back to

the start of the loop (1); if none are received…

(7) Activate the 32-cycle Start-up Timer and look for

pulses; if a fan pulse is detected, branch back to

the start of the loop (1); if none are received…

(8) Quit Normal Operation and go to Fan Fault.

(9) End.

2002 Microchip Technology Inc.

DS21447C-page 7

TC647

Normal

Operaton

Power-Up

Clear

Missing Pulse

Detector

Power-on

Reset

FAULT = 1

Yes

< V

SHDN

Shutdown

= 0

V

MIN

V

OUT

Yes

Shutdown

= 0

V

< V

?

SHDN

MIN

No

V

No

OUT

V

?

REL

>

MIN

No

V

> V

REL

MIN

No

Yes

Fire Start-up

Timer

(1 SEC)

Yes

Power-up

Fire Start-up

TimYeErS

(1 SEC)

Yes

Fan Fault

Detected?

Fan Pulse

Detected?

No

V

OUT

Proportional to Greater

of V

Normal

Operation

No

V

or

IN

MIN

Fan Fault

Yes

No

Fan Pulse

Detected?

M.P.D.

Expired?

Fan Fault

No

Yes

Fire Diagnostic

Timer

(100msec)

FAULT = 0,

= 0

V

OUT

No

Fan Pulse

Detected?

Fire Start-up

Timer

(1 SEC)

Yes

No

Cycling

Power?

No

V

< V

?

SHDN

MIN

Yes

Fan Pulse

Detected?

Yes

No

V

> V

REL

?

MIN

Fan Fault

Yes

Power-up

FIGURE 4-1:

TC647 Behavioral Algorithm Flowchart.

DS21447C-page 8

2002 Microchip Technology Inc.

TC647

The TC642 demonstration and prototyping board

(TC642DEMO) and the TC642 Evaluation Kit

(TC642EV) provide working examples of TC647 cir-

cuits and prototyping aids. The TC642DEMO is a

printed circuit board optimized for small size and ease

of inclusion into system prototypes. The TC642EV is a

larger board intended for benchtop development and

analysis. At the very least, anyone contemplating a

design using the TC647 should consult the documen-

tation for both TC642EV and (DS21403) and

TC642DEMO (DS21401). Figure 5-1 shows the base

schematic for the TC642DEMO.

5.0

TYPICAL APPLICATIONS

Designing with the TC647 involves the following:

(1) The temp sensor network must be configured to

deliver 1.25V to 2.65V on V for 0% to 100% of

IN

the temperature range to be regulated.

(2) The minimum fan speed (V ) must be set.

(3) The output drive transistor and associated circuitry

must be selected.

MIN

(4) The SENSE network, R

and C

, must

SENSE

be designed for maximum efficiency while

delivering adequate signal amplitude.

(5) If shutdown capability is desired, the drive require-

ments of the external signal or circuit must be

considered.

+5V*

+12V

C

B

1 µF

NTC

R

1

8

Fan

1

V

DD

IN

C

B

0.01 µF

Fan Fault

Shutdown

6

R

2

Q

FAULT

1

R

BASE

TC647

7

V

OUT

R

3

V

MIN

5

C

B

0.01 µF

SENSE

2

Shutdown

C

SENSE

C

F

R

4

R

SENSE

C

1 µF

GND

4

F

(Optional)

Note: *See cautions regarding latch-up considerations in Section 5.0, "Typical Applications".

FIGURE 5-1:

Typical Application Circuit.

2002 Microchip Technology Inc.

DS21447C-page 9

TC647

EQUATION

5.1

Temperature Sensor Design

V

x R

2

The temperature signal connected to V must output a

DD

IN

= V(T )

1

voltage in the range of 1.25V to 2.65V (typical) for 0%

to 100% of the temperature range of interest. The

circuit in Figure 5-2 illustrates a convenient way to

provide this signal.

R

(T ) + R

1 2

TEMP

V

x R

2

DD

= V(T )

2

R

(T ) + R

2 2

TEMP

V

DD

Where T and T are the chosen temperatures and

1

2

R

is the parallel combination of the thermistor

TEMP

and R .

I

1

DIV

These two equations facilitate solving for the two

unknown variables, R and R . More information about

1

2

Thermistors may be obtained from AN679, “Tempera-

ture Sensing Technologies”, and AN685, “Thermistors

in Single Supply Temperature Sensing Circuits”, which

can be downloaded from Microchip’s website at

www.microchip.com.

RT

NTC

Thermistor

R

= 100 kΩ

1

2

100 kΩ @ 25ºC

V

IN

5.2

Minimum Fan Speed

= 23.2 kΩ

A voltage divider on V

sets the minimum PWM duty

MIN

cycle and, thus, the minimum fan speed. As with the

V

input, 1.25V to 2.65V corresponds to 0% to 100%

IN

FIGURE 5-2:

Temperature Sensing

duty cycle. Assuming that fan speed is linearly related

to duty cycle, the minimum speed voltage is given by

the equation:

Circuit.

Figure 5-2 illustrates a simple temperature dependent

voltage divider circuit. RT is a conventional 100 kΩ @

1

EQUATION

25°C NTC thermistor, while R and R are standard

1

2

resistors. The supply voltage, V , is divided between

DD

Minimum Speed

x (1.4V) + 1.25V

R and the parallel combination of RT and R (for con-

2

1

V

=

MIN

Full Speed

venience, the parallel combination of RT and R will

1

be referred to as R

). The resistance of the ther-

TEMP

For example, if 2500 RPM equates to 100% fan speed,

and a minimum speed of 1000 RPM is desired, then

mistor at various temperatures is obtained from the

manufacturer’s specifications. Thermistors are often

referred to in terms of their resistance at 25°C. Gener-

ally, the thermistor shown in Figure 5-2 is a non-linear

device with a negative temperature coefficient (also

the V

voltage is:

MIN

EQUATION

called an NTC thermistor). In Figure 5-2, R is used to

1

1000

2500

x (1.4V) + 1.25V = 1.81V

V

=

linearize the thermistor temperature response and R

MIN

2

is used to produce a positive temperature coefficient at

the V node. As an added benefit, this configuration

IN

The V

voltage may be set using a simple resistor

MIN

produces an output voltage delta of 1.4V, which is well

divider as shown in Figure 5-3. Per Section 1.0,

“Electrical Characteristics”, the leakage current at the

within the range of the V

specification of the

C(SPAN)

TC647. A 100 kΩ NTC thermistor is selected for this

application in order to keep I at a minimum.

V

pin is no more than 1 µA. It would be very

MIN

DIV

conservative to design for a divider current, I , of

DIV

For the voltage range at V to be equal to 1.25V to

IN

100 µA. If V = 5.0V then;

DD

2.65V, the temperature range of this configuration is

0°C to 50°C. If a different temperature range is required

EQUATION

from this circuit, R should be chosen to equal the

1

resistance value of the thermistor at the center of this

new temperature range. It is suggested that a maxi-

mum temperature range of 50°C be used with this cir-

cuit due to thermistor linearity limitations. With this

5.0V

–4

I

= 1e A =

, therefore

DIV

R + R

1

2

5.0V

1e A

R + R =

= 50,000 Ω = 50 kΩ

1

2

–4

change, R is adjusted according to the following

2

equations:

DS21447C-page 10

2002 Microchip Technology Inc.

TC647

V

output is “off” most of the time. The fan may be

OUT

V

DD

rotating normally, but the commutation events are

occurring during the PWM’s off-time.

The phase relationship between the fan’s commutation

and the PWM edges tends to “walk around” as the

system operates. At certain points, the TC647 may fail

to capture a pulse within the 32-cycle missing pulse

detector window. When this happens, the 3-cycle

R

1

I

IN

Diagnostic Timer will be activated, the V

output will

OUT

I

V

DIV

MIN

be active continuously for three cycles and, if the fan is

operating normally, a pulse will be detected. If all is

well, the system will return to normal operation. There

is no harm in this behavior, but it may be audible to the

user as the fan will accelerate briefly when the

Diagnostic Timer fires. For this reason, it is

R

2

recommended that V

be set no lower than 1.8V.

MIN

GND

5.4

FanSense^™Network

(R_SENSEand C_SENSE

FIGURE 5-3:

V

Circuit.

MIN

)

We can further specify R and R by the condition that

1

2

the divider voltage is equal to our desired V . This

The FanSense network, comprised of R

and

MIN

SENSE

yields the following equation:

C

, allows the TC647 to detect commutation of

SENSE

the fan motor (FanSense™ technology). This network

can be thought of as a differentiator and threshold

EQUATION

detector. The function of R

current into a voltage. C

is to convert the fan

SENSE

V

x R

2

DD

serves to AC-couple this

V

=

MIN

voltage signal and provide a ground referenced input to

the SENSE pin. Designing a proper SENSE network is

R + R

1

2

simply a matter of scaling R

to provide the

SENSE

Solving for the relationship between R and R results

in the following equation:

1

2

necessary amount of gain (i.e., the current-to-voltage

conversion ratio). A 0.1 µF ceramic capacitor is recom-

mended for C

. Smaller values require larger

SENSE

EQUATION

sense resistors, and higher value capacitors are bulkier

and more expensive. Using a 0.1 µF results in

V

- V

DD

MIN

R = R x

1

2

reasonable values for R

. Figure 5-4 illustrates a

SENSE

V

MIN

typical SENSE network. Figure 5-5 shows the

waveforms observed using a typical SENSE network.

In this example, R = (1.762) R . Substituting this rela-

tionship back into the previous equation yields the

resistor values:

1

2

V

DD

R = 18.1 kΩ

2

R = 31.9 kΩ

1

In this case, the standard values of 31.6 kΩ and

18.2 kΩ are very close to the calculated values and

would be more than adequate.

FAN

R

5.3

Operations at Low Duty Cycle

BASE

V

OUT

Q

1

One boundary condition which may impact the selec-

tion of the minimum fan speed is the irregular activation

of the Diagnostic Timer due to the TC647 “missing” fan

commutation pulses at low speeds. This is a natural

consequence of low PWM duty cycles (typically 25% or

less). Recall that the SENSE function detects commu-

tation of the fan as disturbances in the current through

SENSE

C

SENSE

(0.1 µF Typ.)

R

SENSE

R

. These can only occur when the fan is ener-

SENSE

GND

gized (i.e., V

is “on”). At very low duty cycles, the

OUT

FIGURE 5-4:

SENSE Network.

2002 Microchip Technology Inc.

DS21447C-page 11

TC647

5.5

Output Drive Transistor Selection

Tek Run: 10.0kS/s Sample

The TC647 is designed to drive an external transistor

[

T

]

or MOSFET for modulating power to the fan. This is

shown as Q in Figures 3-1, 5-1, 5-4, 5-6, 5-7, 5-8

1

and 5-9. The V

pin has a minimum source current

OUT

of 5 mA and a minimum sink current of 1 mA. Bipolar

transistors or MOSFETs may be used as the power

switching element, as shown in Figure 5-7. When high

current gain is needed to drive larger fans, two transis-

tors may be used in a Darlington configuration. These

circuit topologies are shown in Figure 5-7: (a) shows a

single NPN transistor used as the switching element;

(b) illustrates the Darlington pair; and (c) shows an N-

channel MOSFET.

Waveform @ Sense Resistor

Waveform @ Sense Pin

GND

1

2

90mV

50mV

GND

T

One major advantage of the TC647’s PWM control

scheme versus linear speed control is that the power

dissipation in the pass element is kept very low. Gener-

ally, low cost devices in very small packages, such as

TO-92 or SOT, can be used effectively. For fans with

nominal operating currents of no more than 200 mA, a

single transistor usually suffices. Above 200 mA, the

Darlington or MOSFET solution is recommended. For

the fan sensing function to work correctly, it is impera-

tive that the pass transistor be fully saturated when

“on”.

Table 5-2 gives examples of some commonly available

transistors and MOSFETs. This table should be used

as a guide only since there are many transistors and

MOSFETs which will work just as well as those listed.

The critical issues when choosing a device to use as

100mV

M5.00ms

142mV

Ch1

Ch2

100mV

Ch1

FIGURE 5-5:

SENSE Waveforms.

Table 5-1 lists the recommended values of R

SENSE

based on the nominal operating current of the fan. Note

that the current draw specified by the fan manufacturer

may be a worst-case rating for near-stall conditions and

not the fan’s nominal operating current. The values in

Table 5-1 refer to actual average operating current. If

the fan current falls between two of the values listed,

use the higher resistor value. The end result of employ-

ing Table 5-1 is that the signal developed across the

sense resistor is approximately 450 mV in amplitude.

TABLE 5-1:

Nominal Fan Current (mA)

R_SENSEVS. FAN CURRENT

Q

V

are: (1) the breakdown voltage (V

or

1

DS

(BR)CEO

(MOSFET)) must be large enough to withstand the

R

(Ω)

SENSE

9.1

4.7

3.0

2.4

2.0

1.8

1.5

1.3

1.2

1.0

highest voltage applied to the fan (Note: This will occur

when the fan is off); (2) 5 mA of base drive current must

be enough to saturate the transistor when conducting

the full fan current (transistor must have sufficient

50

100

150

200

250

300

350

400

450

500

gain); (3) the V

voltage must be high enough to suf-

OUT

ficiently drive the gate of the MOSFET to minimize the

R

of the device; (4) rated fan current draw must

DS(on)

be within the transistor's/MOSFET's current handling

capability; and (5) power dissipation must be kept

within the limits of the chosen device.

A base-current limiting resistor is required with bipolar

transistors. This is shown in Figure 5-6.

DS21447C-page 12

2002 Microchip Technology Inc.

TC647

The correct value for this resistor can be determined as

follows:

V

DD

V

= V_RSENSE+ V

+ V

RBASE

OH

BE(SAT)

x R

SENSE

= I

RSENSE

RBASE

BASE

FAN

= R

= I

x I

BASE

/ h

FAN FE

Fan

I

V

is specified as 80% of V

in Section 1.0,

DD

OH

“Electrical Characteristics”; V

is given in the cho-

BE(SAT)

R

BASE

sen transistor data sheet. It is now possible to solve for

R

V

= 80% V

DD

OH

Q

R

1

.

–

+

BASE

V

R

BASE

–

+

V

BE

(SAT)

EQUATION

+

V

R

V

- V

SENSE

–

SENSE

OH

BE(SAT) RSENSE

R

=

BASE

I

BASE

Some applications require the fan to be powered from the

negative 12V supply to keep motor noise out of the

positive voltage power supplies. As shown in Figure 5-8,

GND

FIGURE 5-6:

BASE

Circuit For Determining

R

.

zener diode D offsets the -12V power supply voltage,

1

holding transistor Q off when V

is low. When V

1

is

OUT

1

OUT

high, the voltage at the anode of D increases by V

causing Q to turn on. Operation is otherwise the same as

1

the case of fan operation from +12V.

TABLE 5-2:

Device

TRANSISTORS AND MOSFETS FOR Q (V = 5V)

1

DD

Max. V

/V

V

/V

Fan Current

(mA)

Suggested

BE(sat) GS

CEO DS

Package

Min. H

FE

(V)

R

(Ω)

BASE

800

301

Note 1

MMBT2222A

MPS2222A

MPS6602

SI2302

MGSF1N02E

SI4410

SOT-23

TO-92

SOT-23

SO-8

1.2

2.5

4.5

50

NA

40

20

30

60

150

500

1000

500

SI2308

SOT-23

Note 1: A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times.

2002 Microchip Technology Inc.

DS21447C-page 13

TC647

V

DD

V

DD

Fan

R

BASE

R

BASE

V

OUT

Q

1

V

Q

R

OUT

1

Q

R

V

1

OUT

Q

2

SENSE

R

SENSE

GND

b) Darlington Transistor Pair

a) Single Bipolar Transistor

C) N-Channel MOSFET

FIGURE 5-7:

Output Drive Transistor Circuit Topologies.

ing points can result in enough parasitic capacitance

and/or inductance in the power supply connections to

delay one power supply “routing” versus another.

+5V

V

DD

R

*

2

2.2 kΩ

5.7

Power Supply Routing and

Bypassing

V

OUT

Fan

Q

D

1

TC647

12.0V

Zener

Noise present on the V and V

inputs may cause

IN

MIN

*

erroneous operation of the FAULT output. As a result,

these inputs should be bypassed with a 0.01 µF capac-

itor mounted as close to the package as possible. This

1

GND

R

*

R

2.2 Ω

*

4

3

10 kΩ

is particularly true of V , which is usually driven from a

IN

high impedance source (such as a thermistor). In addi-

tion, the V

input should be bypassed with a 1 µF

DD

-12V

*Note: Value depends on the specific application and is shown for example only.

capacitor. Ground should be kept as short as possible.

To keep fan noise off the TC647 ground pin, individual

ground returns for the TC647 and the low side of the

fan current sense resistor should be used.

FIGURE 5-8:

Powering the Fan from a

-12V Supply.

Design Example

5.6

Latch-Up Considerations

Step 1. Calculate R and R based on using an NTC

1

2

having a resistance of 10 kΩ at T

(25°C)

MIN

As with any CMOS IC, the potential exists for latch-up

if signals are applied to the device which are outside

the power supply range. This is of particular concern

during power-up if the external circuitry (such as the

and 4.65 kΩ at T

(45°C) (see Figure 5-9).

MAX

R = 20.5 kΩ

1

R = 3.83 kΩ

2

sensor network, V

divider or shutdown circuit) is

Step 2. Set minimum fan speed V

= 1.8V.

MIN

powered by a supply different from that of the TC647.

Limit the divider current to 100 µA from which

Care should be taken to ensure that the TC647’s V

R = 33 kΩ and R = 18 kΩ

DD

5

6

supply powers up first. If possible, the networks

Step 3. Design the output circuit.

attached to V and V

should connect to the V

DD

IN

MIN

Maximum fan motor current = 250 mA.

supply at the same physical location as the IC itself.

Even if the IC and any external networks are powered

by the same supply, physical separation of the connect-

Q beta is chosen at 50 from which

1

R = 800Ω.

7

DS21447C-page 14

2002 Microchip Technology Inc.

TC647

+5V

+12V

Fan

+

NTC

10 kΩ

@ 25°C

1

C

B

R

1

1 µF

20.5 kΩ

8

4

V

DD

V

GND

IN

C

B

R

2

0.01 µF

System

Fault

6

3.83 kΩ

Q

FAULT

1

+5V

R

800 Ω

7

TC647

7

5

V

OUT

R

33 kΩ

5

3

V

MIN

C

B

0.01 µF

2

SENSE

C

Fan Shutdown

SENSE

0.1 µF

Q

2

R

6

18 kΩ

C

F

R

10 kΩ

R

SENSE

8

2.2 Ω

C

1 µF

1

(Optional)

FIGURE 5-9:

Design Example.

5.8

TC647 as a Microcontroller

Peripheral

In a system containing a microcontroller or other host

intelligence, the TC647 can be effectively managed as

a CPU peripheral. Routine fan control functions can be

performed by the TC647 without controller intervention.

The microcontroller receives temperature data from one

or more points throughout the system. It calculates a fan

operating speed based on an algorithm specifically

designed for the application at hand. The processor

controls fan speed using complimentary port bits I/O1

through I/O3. Resistors R through R (5% tolerance)

1

6

form a crude 3-bit DAC that translates the 3-bit code

from the controller or processor's outputs into a 1.6V DC

control signal. A monolithic DAC or digital pot may be

used instead of the circuit shown in Figure 5-10.

With V

set to 1.8V, the TC647 has a minimum

MIN

operating speed of approximately 40% of full rated

speed when the processor's output code is 000[B].

Output codes 001[B] to 111[B] operate the fan from

roughly 40% to 100% of full speed. An open-drain

output from the processor I/O can be used to reset the

TC647 following detection of a fault condition. The

FAULT output can be connected to the processor's

interrupt input, or to an I/O pin, for polled operation (see

Figure 5-10).

2002 Microchip Technology Inc.

DS21447C-page 15

TC647

+12V

Fan

+5V

Open-drain

Outputs

(Optional)

(RESET)

(MSB)

I/O0

+5V

R

1

8

110 kΩ

1

2

I/O1

I/O2

I/O3

V

IN

V

DD

+

C

B

R

2

240 kΩ

C

.01 µF

B

Analog or Digital

Temperature

Data from one or

more Sensors

1 µF

R

800Ω

CMOS

Outputs

9

7

C

V

R

3

360 kΩ

F

OUT

2N2222A

+

+5V

TC647

1 µF

R

10

R

18 kΩ

7

(LSB)

4

CMOS

Microcontroller

33 kΩ

+5V

18 kΩ

10 kΩ

3

6

5

R

5

V

MIN

FAULT

1.5 kΩ

C

B

R

+5V

8

.01 µF

0.1 µF

4

R

6

SENSE

GND

1 kΩ

R

11

2.2Ω

GND

INT

FIGURE 5-10:

TC647 as a Microcontroller Peripheral.

DS21447C-page 16

2002 Microchip Technology Inc.

TC647

6.0

6.1

PACKAGING INFORMATION

Package Marking Information

8-Lead PDIP (300 mil)

Example:

XXXXXXXX

NNN

TC647VPA

025

YYWW

0215

8-Lead SOIC (150 mil)

Example:

XXXXXXXX

YYWW

TC647VOA

0215

NNN

025

Example:

8-Lead MSOP

TC647E

XXXXXX

YWWNNN

215025

Legend: XX...X Customer specific information*

YY

WW

NNN

Year code (last 2 digits of calendar year)

Week code (week of January 1 is week ‘01’)

Alphanumeric traceability code

Note:

In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line thus limiting the number of available characters

for customer specific information.

*

Standard marking consists of Microchip part number, year code, week code, traceability code (facility

code, mask rev#, and assembly code). For marking beyond this, certain price adders apply. Please check

with your Microchip Sales Office.

2002 Microchip Technology Inc.

DS21447C-page 17

TC647

8-Lead Plastic Dual In-line (P) – 300 mil (PDIP)

E1

D

2

n

1

α

E

A2

A

L

c

A1

β

B1

B

p

eB

Units

Dimension Limits

INCHES*

NOM

MILLIMETERS

MIN

MAX

MIN

NOM

8

MAX

n

p

A

A2

A1

E

E1

D

L

c

B1

B

Number of Pins

Pitch

Top to Seating Plane

Molded Package Thickness

Base to Seating Plane

Shoulder to Shoulder Width

Molded Package Width

Overall Length

Tip to Seating Plane

Lead Thickness

Upper Lead Width

Lower Lead Width

Overall Row Spacing

Mold Draft Angle Top

Mold Draft Angle Bottom

8

.100

.155

.130

2.54

3.94

3.30

.140

.170

.145

3.56

2.92

4.32

3.68

.115

.015

.300

.240

.360

.125

.008

.045

.014

.310

5

0.38

7.62

6.10

9.14

3.18

0.20

1.14

0.36

7.87

5

.313

.250

.373

.130

.012

.058

.018

.370

10

.325

.260

.385

.135

.015

.070

.022

.430

15

7.94

6.35

9.46

3.30

0.29

1.46

0.46

9.40

10

8.26

6.60

9.78

3.43

0.38

1.78

0.56

10.92

15

§

eB

α

β

5

10

15

5

10

15

* Controlling Parameter

§ Significant Characteristic

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed

.010” (0.254mm) per side.

JEDEC Equivalent: MS-001

Drawing No. C04-018

DS21447C-page 18

2002 Microchip Technology Inc.

TC647

8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC)

E

E1

p

D

2

B

n

1

h

α

45×

c

A2

A

f

β

L

A1

Units

INCHES*

NOM

MILLIMETERS

Dimension Limits

MIN

MAX

MIN

NOM

8

MAX

n

p

A

A2

A1

E

E1

D

h

L

f

Number of Pins

Pitch

Overall Height

8

.050

.061

.056

.007

.237

.154

.193

.015

.025

4

1.27

.053

.069

1.35

1.32

1.55

1.42

0.18

6.02

3.91

4.90

0.38

0.62

4

1.75

1.55

0.25

6.20

3.99

5.00

0.51

0.76

8

Molded Package Thickness

Standoff

.052

.004

.228

.146

.189

.010

.019

0

.061

.010

.244

.157

.197

.020

.030

8

§

0.10

5.79

3.71

4.80

0.25

0.48

0

Overall Width

Molded Package Width

Overall Length

Chamfer Distance

Foot Length

Foot Angle

c

Lead Thickness

Lead Width

.008

.013

0

.009

.017

12

.010

.020

15

0.20

0.33

0

0.23

0.42

12

0.25

0.51

15

B

α

β

Mold Draft Angle Top

Mold Draft Angle Bottom

0

12

15

0

12

15

* Controlling Parameter

§ Significant Characteristic

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed

.010” (0.254mm) per side.

JEDEC Equivalent: MS-012

Drawing No. C04-057

2002 Microchip Technology Inc.

DS21447C-page 19

TC647

6.2

8-Lead Plastic Micro Small Outline Package (MS) (MSOP)

E

p

E1

D

2

1

B

n

α

A2

A

c

φ

A1

(F)

L

β

Units

Dimension Limits

INCHES

NOM

MILLIMETERS*

NOM

MIN

MAX

MIN

MAX

8

n

p

Number of Pins

Pitch

8

.026

0.65

Overall Height

Molded Package Thickness

A

A2

A1

E

E1

D

.044

1.18

.030

.034

.038

.006

.200

.122

.028

.039

0.76

0.05

0.86

0.97

0.15

.5.08

3.10

0.70

1.00

Standoff

§

.002

.184

.114

.016

.035

Overall Width

Molded Package Width

Overall Length

Foot Length

Footprint (Reference)

Foot Angle

.193

.118

.022

.037

4.90

3.00

0.55

0.95

4.67

2.90

0.40

0.90

L

F

φ

0

6

0

6

c

Lead Thickness

Lead Width

Mold Draft Angle Top

Mold Draft Angle Bottom

.004

.010

.006

.012

.008

.016

0.10

0.25

0.15

0.30

0.20

0.40

B

α

β

7

*Controlling Parameter

§ Significant Characteristic

Notes:

Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not

exceed. 010" (0.254mm) per side.

Drawing No. C04-111

DS21447C-page 20

2002 Microchip Technology Inc.

TC647

6.3

Taping Form

Component Taping Orientation for 8-Pin SOIC (Narrow) Devices

User Direction of Feed

PIN 1

W

P

Standard Reel Component Orientation

for TR Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

8-Pin SOIC (N)

12 mm

8 mm

2500

13 in

Component Taping Orientation for 8-Pin MSOP Devices

User Direction of Feed

PIN 1

W

P

Standard Reel Component Orientation

for TR Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

Package

Carrier Width (W)

Pitch (P)

Part Per Full Reel

Reel Size

8-Pin MSOP

12 mm

8 mm

2500

13 in

2002 Microchip Technology Inc.

DS21447C-page 21

TC647

NOTES:

DS21447C-page 22

2002 Microchip Technology Inc.

TC647

ON-LINE SUPPORT

Microchip provides on-line support on the Microchip

World Wide Web site.

SYSTEMS INFORMATION AND

UPGRADE HOT LINE

The Systems Information and Upgrade Line provides

system users a listing of the latest versions of all of

Microchip's development systems software products.

Plus, this line provides information on how customers

can receive the most current upgrade kits.The Hot Line

Numbers are:

1-800-755-2345 for U.S. and most of Canada, and

1-480-792-7302 for the rest of the world.

The web site is used by Microchip as a means to make

files and information easily available to customers. To

view the site, the user must have access to the Internet

®

and a web browser, such as Netscape or Microsoft

Internet Explorer. Files are also available for FTP

download from our FTP site.

ConnectingtotheMicrochipInternetWebSite

The Microchip web site is available at the following

URL:

092002

www.microchip.com

The file transfer site is available by using an FTP ser-

vice to connect to:

ftp://ftp.microchip.com

The web site and file transfer site provide a variety of

services. Users may download files for the latest

Development Tools, Data Sheets, Application Notes,

User's Guides, Articles and Sample Programs. A vari-

ety of Microchip specific business information is also

available, including listings of Microchip sales offices,

distributors and factory representatives. Other data

available for consideration is:

• Latest Microchip Press Releases

• Technical Support Section with Frequently Asked

Questions

• Design Tips

• Device Errata

• Job Postings

• Microchip Consultant Program Member Listing

• Links to other useful web sites related to

Microchip Products

• Conferences for products, Development Systems,

technical information and more

• Listing of seminars and events

2002 Microchip Technology Inc.

DS21447C-page23

TC647

READER RESPONSE

It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-

uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation

can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.

Please list the following information, and use this outline to provide us with your comments about this document.

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Would you like a reply?

Y

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Literature Number:

DS21447C

Device:

TC647

Questions:

1. What are the best features of this document?

2. How does this document meet your hardware and software development needs?

3. Do you find the organization of this document easy to follow? If not, why?

4. What additions to the document do you think would enhance the structure and subject?

5. What deletions from the document could be made without affecting the overall usefulness?

6. Is there any incorrect or misleading information (what and where)?

7. How would you improve this document?

DS21447C-page24

2002 Microchip Technology Inc.

TC647

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO.

Device

X

/XX

Examples:

Temperature Package

Range

a)

b)

c)

d)

TC647VOA: PWM Fan Speed Controller w/

Fault Detection, SOIC package.

TC647VUA: PWM Fan Speed Controller w/

Fault Detection, MSOP package.

TC647VPA: PWM Fan Speed Controller w/

Fault Detection, PDIP package.

TC647EOATR: PWM Fan Speed Controller

w/Fault Detection, SOIC package, Tape and

Reel.

Device:

TC647:

PWM Fan Speed Controller w/Fault Detection

Temperature Range:

Package:

V

E

=

0°C to +85°C

-40°C to +85°C

PA

OA

UA

=

Plastic DIP (300 mil Body), 8-lead *

Plastic SOIC, (150 mil Body), 8-lead

Plastic Micro Small Outline (MSOP), 8-lead

* PDIP package is only offered in the V temp range

Sales and Support

Data Sheets

Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-

mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

1. Your local Microchip sales office

2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277

3. The Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

New Customer Notification System

Register on our web site (www.microchip.com/cn) to receive the most current information on our products.

2002 Microchip Technology Inc.

DS21447C-page25

TC647

NOTES:

DS21447C-page 26

2002 Microchip Technology Inc.

Information contained in this publication regarding device

applications and the like is intended through suggestion only

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

No representation or warranty is given and no liability is

assumed by Microchip Technology Incorporated with respect

to the accuracy or use of such information, or infringement of

patents or other intellectual property rights arising from such

use or otherwise. Use of Microchip’s products as critical com-

ponents in life support systems is not authorized except with

express written approval by Microchip. No licenses are con-

veyed, implicitly or otherwise, under any intellectual property

rights.

Trademarks

The Microchip name and logo, the Microchip logo, KEELOQ,

MPLAB, PIC, PICmicro, PICSTART and PRO MATE are

registered trademarks of Microchip Technology Incorporated

in the U.S.A. and other countries.

FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL

and The Embedded Control Solutions Company are

registered trademarks of Microchip Technology Incorporated

in the U.S.A.

dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense,

FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP,

ICEPIC, microPort, Migratable Memory, MPASM, MPLIB,

MPLINK, MPSIM, PICC, PICDEM, PICDEM.net, rfPIC, Select

Mode and Total Endurance are trademarks of Microchip

Technology Incorporated in the U.S.A. and other countries.

Serialized Quick Turn Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999

and Mountain View, California in March 2002.

The Company’s quality system processes and

procedures are QS-9000 compliant for its

®

PICmicro 8-bit MCUs, KEELOQ^®code hopping

devices, Serial EEPROMs, microperipherals,

non-volatile memory and analog products. In

addition, Microchip’s quality system for the

design and manufacture of development

systems is ISO 9001 certified.

2002 Microchip Technology Inc.

DS21447C - page 27

M

WORLDWIDE SALES AND SERVICE

Japan

AMERICAS

ASIA/PACIFIC

Microchip Technology Japan K.K.

Benex S-1 6F

Corporate Office

Australia

2355 West Chandler Blvd.

Microchip Technology Australia Pty Ltd

Suite 22, 41 Rawson Street

Epping 2121, NSW

3-18-20, Shinyokohama

Kohoku-Ku, Yokohama-shi

Kanagawa, 222-0033, Japan

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Chandler, AZ 85224-6199

Tel: 480-792-7200 Fax: 480-792-7277

Technical Support: 480-792-7627

Web Address: http://www.microchip.com

Australia

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

Korea

Rocky Mountain

China - Beijing

Microchip Technology Korea

168-1, Youngbo Bldg. 3 Floor

Samsung-Dong, Kangnam-Ku

Seoul, Korea 135-882

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7966 Fax: 480-792-4338

Microchip Technology Consulting (Shanghai)

Co., Ltd., Beijing Liaison Office

Unit 915

Bei Hai Wan Tai Bldg.

Tel: 82-2-554-7200 Fax: 82-2-558-5934

Atlanta

No. 6 Chaoyangmen Beidajie

Beijing, 100027, No. China

Tel: 86-10-85282100 Fax: 86-10-85282104

500 Sugar Mill Road, Suite 200B

Atlanta, GA 30350

Singapore

Microchip Technology Singapore Pte Ltd.

200 Middle Road

Tel: 770-640-0034 Fax: 770-640-0307

China - Chengdu

#07-02 Prime Centre

Boston

Microchip Technology Consulting (Shanghai)

Co., Ltd., Chengdu Liaison Office

Rm. 2401, 24th Floor,

Singapore, 188980

2 Lan Drive, Suite 120

Westford, MA 01886

Tel: 978-692-3848 Fax: 978-692-3821

Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan

Ming Xing Financial Tower

Microchip Technology (Barbados) Inc.,

Taiwan Branch

Chicago

No. 88 TIDU Street

333 Pierce Road, Suite 180

Itasca, IL 60143

Chengdu 610016, China

11F-3, No. 207

Tel: 86-28-86766200 Fax: 86-28-86766599

Tung Hua North Road

Taipei, 105, Taiwan

Tel: 630-285-0071 Fax: 630-285-0075

China - Fuzhou

Dallas

Microchip Technology Consulting (Shanghai)

Co., Ltd., Fuzhou Liaison Office

Unit 28F, World Trade Plaza

Tel: 886-2-2717-7175 Fax: 886-2-2545-0139

4570 Westgrove Drive, Suite 160

Addison, TX 75001

Tel: 972-818-7423 Fax: 972-818-2924

No. 71 Wusi Road

EUROPE

Austria

Detroit

Fuzhou 350001, China

Tri-Atria Office Building

Tel: 86-591-7503506 Fax: 86-591-7503521

Microchip Technology Austria GmbH

Durisolstrasse 2

32255 Northwestern Highway, Suite 190

Farmington Hills, MI 48334

Tel: 248-538-2250 Fax: 248-538-2260

China - Shanghai

Microchip Technology Consulting (Shanghai)

Co., Ltd.

A-4600 Wels

Austria

Kokomo

Room 701, Bldg. B

Tel: 43-7242-2244-399

Fax: 43-7242-2244-393

Denmark

2767 S. Albright Road

Kokomo, Indiana 46902

Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

Far East International Plaza

No. 317 Xian Xia Road

Shanghai, 200051

Microchip Technology Nordic ApS

Regus Business Centre

Lautrup hoj 1-3

Tel: 86-21-6275-5700 Fax: 86-21-6275-5060

18201 Von Karman, Suite 1090

Irvine, CA 92612

China - Shenzhen

Microchip Technology Consulting (Shanghai)

Co., Ltd., Shenzhen Liaison Office

Rm. 1315, 13/F, Shenzhen Kerry Centre,

Renminnan Lu

Ballerup DK-2750 Denmark

Tel: 949-263-1888 Fax: 949-263-1338

Tel: 45 4420 9895 Fax: 45 4420 9910

New York

France

150 Motor Parkway, Suite 202

Hauppauge, NY 11788

Microchip Technology SARL

Parc d’Activite du Moulin de Massy

43 Rue du Saule Trapu

Shenzhen 518001, China

Tel: 631-273-5305 Fax: 631-273-5335

Tel: 86-755-2350361 Fax: 86-755-2366086

San Jose

China - Hong Kong SAR

Batiment A - ler Etage

Microchip Technology Inc.

2107 North First Street, Suite 590

San Jose, CA 95131

Microchip Technology Hongkong Ltd.

Unit 901-6, Tower 2, Metroplaza

223 Hing Fong Road

91300 Massy, France

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany

Tel: 408-436-7950 Fax: 408-436-7955

Kwai Fong, N.T., Hong Kong

Microchip Technology GmbH

Steinheilstrasse 10

Tel: 852-2401-1200 Fax: 852-2401-3431

Toronto

6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada

Tel: 905-673-0699 Fax: 905-673-6509

India

D-85737 Ismaning, Germany

Tel: 49-89-627-144 0 Fax: 49-89-627-144-44

Microchip Technology Inc.

India Liaison Office

Italy

Divyasree Chambers

Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

1 Floor, Wing A (A3/A4)

No. 11, O’Shaugnessey Road

Bangalore, 560 025, India

Tel: 91-80-2290061 Fax: 91-80-2290062

Milan, Italy

Tel: 39-039-65791-1 Fax: 39-039-6899883

United Kingdom

Microchip Ltd.

505 Eskdale Road

Winnersh Triangle

Wokingham

Berkshire, England RG41 5TU

Tel: 44 118 921 5869 Fax: 44-118 921-5820

08/01/02

DS21447C-page 28

2002 Microchip Technology Inc.

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	MSOP
包装说明：	TSSOP, TSSOP8,.19	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	16 weeks
风险等级：	0.72	模拟集成电路 - 其他类型：	BRUSHLESS DC MOTOR CONTROLLER
JESD-30 代码：	S-PDSO-G8	JESD-609代码：	e3
长度：	3 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	8
最高工作温度：	85 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSSOP
封装等效代码：	TSSOP8,.19	封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	3.3/5 V	认证状态：	Not Qualified
座面最大高度：	1.1 mm	子类别：	Motion Control Electronics
最大供电电流 (Isup)：	0.4 mA	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	3 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.65 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	3 mm
Base Number Matches：	1

型号	制造商	描述	替代类型	文档
TC647BEUATR	MICROCHIP	PWM Fan Speed Controllers With Minimum Fan Sp	类似代替

型号	制造商	描述	价格	文档
TC647BEUA713	MICROCHIP	PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection	获取价格
TC647BEUATR	MICROCHIP	PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection	获取价格
TC647EOA	MICROCHIP	PWM Fan Speed Controller with FanSense Technology	获取价格
TC647EOATR	MICROCHIP	BRUSHLESS DC MOTOR CONTROLLER, PDSO8, 0.150 INCH, PLASTIC, SOIC-8	获取价格
TC647EPA	MICROCHIP	PWM Fan Speed Controller with FanSense Technology	获取价格
TC647EUA	MICROCHIP	PWM Fan Speed Controller with FanSense Technology	获取价格
TC647EUATR	MICROCHIP	BRUSHLESS DC MOTOR CONTROLLER, PDSO8, PLASTIC, MSOP-8	获取价格
TC647VOA	MICROCHIP	PWM Fan Speed Controller with FanSense Technology	获取价格
TC647VOATR	MICROCHIP	BRUSHLESS DC MOTOR CONTROLLER, PDSO8, 0.150 INCH, PLASTIC, SOIC-8	获取价格
TC647VPA	MICROCHIP	PWM Fan Speed Controller with FanSense Technology	获取价格

TC647BEUA

TC647BEUA 概述

TC647BEUA 规格参数

TC647BEUA 数据手册

TC647BEUA CAD模型

原理图符号

PCB 封装图

3D模型

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