PT6942N_技术文档

PT6940 Series

6-A Dual Output 5-V/3.3-V Input

Integrated Switching Regulator

SLTS155B

Revised (4/8/2002)

Features

• Remote Sensing (Vo₁& Vo₂)

• Soft-Start

• High Efficiency Dual Output

(See Ordering Information)

• Short-Circuit Protection

(coordinated shutdown)

• Ideal Power Source for DSPs

• 5V/3.3V Input

• 27-pin Space-Saving Package

• Solderable Copper Case

• 6A Rated (Both Outputs)

• Internal Power-up Sequencing

• Single On/Off Control

• Independent Adjust/Trim

Pin-Out Information

Ordering Information

Description

PT 6941o = +3.3/2.5 Volts

PT 6942o = +3.3/1.8 Volts

PT 6943o = +3.3/1.5 Volts

PT 6944o = +3.3/1.2 Volts

† PT 6946o = +2.5/1.8 Volts

† PT 6947o = +2.5/1.5 Volts

† PT 6948o = +2.5/1.2 Volts

Pin Function

The PT6940 Excalibur™ power modules

are a series of high-efficiency dual-output

regulators, housed in a solderable space-

saving package. The dual output is ideal

for DSP applications that require a second

voltage source for a processor core.

Both outputs from the PT6940 regulator

modules are rated to deliver a full 6A load

current simultaneously, and are internally

sequenced to comply with the power-up

requirements of popular DSP ICs.

Each output can be independently

adjusted with a single external resistor, and

incorporates an output sense to compensate

for voltage drop between the regulator and

load. A short-circuit load fault at either

output will result in the coordinated

shutdown of both voltages.

Pin Function

1

2

STBY* †

Vo₁Adjust

Vo₁Sense

Vo₁

15

16

1 7

18

19

20

21

22

23

24

25

26

27

V_in

3

GND

Vo₂

4

5

Vo₁

6

Vo₁

† -Denotes models that will also operate off

3.3V input bus.

7

GND

V_in

8

9

PT Series Suffix

(PT1234x)

10

11

12

13

14

Vo₂

Case/Pin

Configuration

Order

Suffix

Package

Vo₂

Code

Vo₂Sense

Vo₂Adjust

Vertical

Horizontal

SMD

N

A

C

(ENE)

(ENF)

(ENG)

V_in

(Reference the applicable package code drawing

for the dimensions and PC layout)

† STBY* pin: Open = Outputs enabled

Ground = Outputs disabled

Standard Application

Vo₁Sense

Vo₂Sense

STBY*

1

3

26

Vo₁

4–6

V_IN

13–16

PT6940

Vo₂

23–25

7–12

17–22

+

C_IN

Co₁

Co₂

L

O

A

D

L

O

A

D

330µF

C_in

= Req’d 330µF * electrolytic

Co₁/Co₂= Req’d 330µF * electrolytic

GND

*300µF for Oscon® or low ESR tantalum

(see application notes)

For technical support and more information, see inside back cover or visit www.ti.com

PT6940 Series

6-A Dual Output 5-V/3.3-V Input

Integrated Switching Regulator

General Specifications (Unless otherwise stated, T_a=25°C, V_in=5V, C_in=330µF, Co₁=330µF, Co₂=330µF, and Io₁/Io₂=Iomax)

PT6940 Series

Characteristic

Symbol

Conditions

Min

Typ

Max

Units

(1)

(2)

OutputCurrent

I_o

T_a=25°C,naturalconvection

T_a=60°C,200LFMairflow

0.1

—

6

A

Input Voltage Range

V_in

OverI_oRange

Vo₁≤2.5V

3.1

4.5

—

5.5

V

Vo₁>2.5V

Set Point Voltage Tolerance

Temperature Variation

Line Regulation

V_otol

Reg_temp

—

0.5

5

2

—

10

%V

o

%V

o

mV

–40° ≤T_a≤ +85°C, I_o=I_omin

Over V_inrange

Over I_orange

Reg

line

Load Regulation

Reg_load

5

Total Output Voltage Variation

∆V_otot

Includes set-point, line, load,

V_o=3.3V

V_o=2.5V

V_o=1.8V

V_o=1.5V

V_o=1.2V

—

43

35

28

25

22

100

–40° ≤T_a≤ +85°C

75

54

45

36

mV

Efficiency

η

V_in=5V, Io₁= Io₂=4A

PT6941

PT6942

PT6943

PT6944

PT6946

PT6947

PT6948

—

92

—

91

90

89

88

87

—

%

V_oRipple (pk-pk)

TransientResponse

V_r

t_tr

∆V_tr

I_sc(pk)

ƒ_o

20MHz bandwidth

1A/µsloadstep, 50%to100%I_omax

V_oover/undershoot

Reset followed by auto-recovery

OverV_inrange

—

35

60

70

13

350

—

mV_pp

µs

mV

A

(3)

Short Circuit Threshold

SwitchingFrequency

300

400

kHz

STBY* (Pin 1)

Referencedto GND(pin7)

(4)

Input High Voltage

InputLowVoltage

V_IH

V_IL

—

Open

+0.4

V

–0.1

Input Low Current

I_IL

I_instandby

—

330

–40

-0.5

10

—

–

20

TBD

+85

+125

—

mA

µF

QuiescentCurrent

ExternalOutputCapacitance

OperatingTemperatureRange

pin 1 to GND

Both outputs

OverV_inRange

(5)

(6)

T

a

—

°C

StorageTemperature

Mechanical Shock

T

s

—

–40

—

°C

Per Mil-STD-883D, Method 2002.3

1msec, ½Sine, mounted

TBD

G’s

(7)

Mechanical Vibration

Mil-STD-883D Method 2007.2,

20-2000 Hz

Vertical

—

TBD

—

G’s

Horizontal

Weight

Flammability

—

Vertical/Horizontal

MeetsUL94V-O

—

34

—

grams

Notes: (1) The outputs, Vo₁and Vo₂, have similar characteristics. The applicable performance parameters are defined according to output voltage.

(2) The minimum output current applies to each output. The module will operate at no load with reduced specifications.

(3) A short-circuit load fault at either output causes the module to continuously reset, affecting both outputs.

(4) The STBY* control (pin 1) has an internal pull-up, and if it is left open circuit the module will operate when input power is applied. The open-circuit voltage

is approximately the input voltage, V_in. Refer to the application notes for interface considerations.

(5) For operating temperatures below 0°C, Cin, Co₁, and Co₂must have stable characteristics. Use either tantalum or Oscon® capacitors.

(6) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating.

(7) Only the case pins on through-hole pin configurations (N & A) must be soldered. For more information see the applicable package outline drawing.

Input/O utput Capacitors: The PT6940 series requires a 330µF electrolytic capacitor at the input and both outputs for proper operation (300µF for Oscon® or low ESR

tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance

may be required. Refer to the application notes for more information.

For technical support and more information, see inside back cover or visit www.ti.com

PT6940 Series

6-A Dual Output 5-V/3.3-V Input

Integrated Switching Regulator

Performance Characteristics; V_in=5V (See Note A)

Performance Characteristics; V_in=3.3V (See Note A)

Efficiency vs. Io₁& Io₂Load Currents

100

95

90

95

90

PT6941

PT6942

85

PT6946

PT6943

80

75

70

65

60

PT6947

PT6948

80

75

70

65

60

PT6944

PT6946

PT6947

PT6948

0

1

2

3

4

5

6

0

1

2

3

4

5

6

Iout (A) [Both Outputs ]

Iout (A) [Both Outputs]

Vo₁Ripple vs. Io₁& Io₂Load Currents

35

30

25

20

15

10

5

35

30

25

20

15

10

5

PT6946

PT6947

PT6948

PT6941

PT6942

PT6943

PT6944

PT6946

PT6947

PT6948

0

1

2

3

4

5

6

0

1

2

3

4

5

6

Iout (A) [Both Outputs]

Vo₂Ripple vs. Io₁& Io₂Load Currents

35

30

25

20

15

10

5

35

30

25

20

15

10

5

PT6941

PT6946

PT6942

PT6947

PT6948

PT6943

PT5944

PT6946

PT6947

PT6948

0

1

2

3

4

5

6

0

1

2

3

4

5

6

Iout (A) [Both Outputs]

Power Dissipation Vs. Io₁& Io₂Load Currents

Power Dissipation vs. Io₁& Io₂Load Currents

5

4

3

2

1

0

5

4

3

2

1

0

1

2

3

4

5

6

0

1

2

3

4

5

6

Iout (A) [Both Outputs]

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.

For technical support and more information, see inside back cover or visit www.ti.com

PT6940 Series

6-A Dual Output 5-V/3.3-V Input

Integrated Switching Regulator

Safe Operating Area Curves;V_in=3.3V/5V (See Note B)

Safe Operating Area Curves; V_in=5V (See Note B)

PT6946 (2.5V/1.8V)

PT6941 (3.3V/2.5V)

90

80

70

60

50

40

30

20

Airflow

70

60

50

40

30

20

Airflow

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

Nat conv

0

1

2

3

4

5

6

0

1

2

3

4

5

6

Iout (A) [Both Outputs]

Iout (A) [Both outputs]

PT6942 (3.3V/1.8V)

PT6947 (2.5V/1.5V)

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

Airflow

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

Nat conv

0

1

2

3

4

5

6

0

1

2

3

4

Iout (A) [Both Outputs]

PT6943 (3.3V/1.5V)

PT6948 (2.5V/1.2V)

90

80

70

60

50

40

30

20

90

80

70

60

50

40

30

20

Airflow

200LFM

120LFM

60LFM

200LFM

120LFM

60LFM

Nat conv

0

1

2

3

4

5

6

0

1

2

3

4

Iout (A) [Both Outputs]

PT6944 (3.3V/1.2V)

90

80

70

60

50

40

30

20

Airflow

200LFM

120LFM

60LFM

Nat conv

0

1

2

3

4

5

6

Iout (A) [Both Outputs]

Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6940 Series

Operating Features of the PT6940 Series

of Dual-Output Voltage Regulators

Over-Current Protection

Standby Control

The PT6940 series of regulators incorporate independent

current limit protection at both outputs (Vo₁& Vo₂) with a

periodic shutdown of both outputs. Applying a load current,

in excess of the current limit threshold to either output,

results in the shutdown of both voltages after a short

period; typically 15ms. Following shutdown the module

periodically attempts to recover by executing a soft start

power-up at intervals of approximately 100ms. If the over-

current fault persists, each attempted restart will result in a

corresponding over-current trip and shutdown. During

the 15ms period prior to each successive shutdown, the

output with the load fault may not reach full regulation.

The output voltages from the PT6940 may be disabled

using the regulator’s Standby control. The standby function

is provided by the “STBY*” control (pin 1). If pin 1 is left

open-circuit the regulator operates normally, and provides

a regulated output at both Vo₁(pins 4–6) and Vo₂(pins 23–

25) whenever a valid input source voltage is applied to V_in

(pins 13–16) with respect to GND (pins 7-12 & 17–22).

Applying a low-impedance sink to ground¹at pin 1, simul-

taneously disables both regulated outputs. This places the

regulator in standby mode, and reduces the input current

drawn by the ISR to typically 10mA. The Standby control

may also be used to maintain both regulator outputs at zero

volts during the period that input power is applied.

The standby pin is ideally controlled using an open-collector

(or open-drain) discrete transistor (See Figure 2). The

open-circuit voltage is the input voltage, V_in.

Power-Up Voltage Sequencing

The output voltages from the PT6940 series regulators are

independently regulated, and internally sequenced to meet

the power-up requirements of popular microprocessors

and DSP chipsets. Figure 1 shows the output voltage wave-

forms of a PT6942 (3.3V/1.8V) after either input power is

applied, or the regulator is enabled. In this example turning

Q₁off in Figure 2, removes the low-voltage signal at pin 1

and enables the regulator. Following a delay of about 3–5ms,

Vo₁and Vo₂rise together until the lower voltage, Vo₂,

reaches its regulation voltage. Vo₁then continues to rise

until both outputs reach full regulation. The total power-

up time is less than 15ms, and is relatively independent of

load, temperature, and output capacitance. The turn-off of

Q₁corresponds to the rise in V_STBY. The waveforms were

measured with a 5V input voltage, and with resistive loads

of 4A at both the Vo₁and Vo₂outputs.

Figure 2

3

26

V₁Sns

V₂Sns

Vo₁

Vo₂

4–6

Vo₁

Vo₂

V_in

13–16

Vin

PT6940

23–25

V₂Adj V₁Adj

17–22 27

STBY*

1

7–12

2

+

C_IN

Co₁

Co₂

Q1

BSS138

Inhibit

COM

Figure 1

Notes:

1.The standby control inpuNt oitscompatible with TTL or

other devices that incorporate a totem-pole output drive. Use

only a true open-collector device, preferably a discrete bipolar

transistor (or MOSFET). To ensure the regulator output is

disabled, the control pin must be pulled to less than 0.4Vdc

with a low-level 0.5mA sink to ground.

V1 (1V/Div)

V2 (1V/Div)

2

Do not use an an external pull-up resistor. The control pin

has its own internal pull-up. Adding an external pull-up

could disable the over-current protection. The open-circuit

voltage of the “STBY*” pin is the input voltage, V_in.

Vstby (5V/Div)

HORIZ SCALE (2ms/Div)

For technical support and more information, see inside back cover or visit www.ti.com

Notes

PT6940 Series

Tantalum Capacitors

Capacitor Recommendations for the

Dual-Output PT6940 Regulator Series

Tantalum type capacitors can be used for the output but only

the AVX TPS series, Sprague 593D/594/595 series or Kemet

T495/T510 series. These capacitors are recommended

over many other tantalum types due to their higher rated

surge, power dissipation, and ripple current capability. As a

caution the TAJ series by AVX is not recommended. This

series has considerably higher ESR, reduced power dissipa-

tion, and lower ripple current capability. The TAJ series is

less reliable than the AVX TPS series when determining

power dissipation capability. Tantalum or Oscon® types

are recommended for applications where ambient tem-

peratures fall below 0°C.

Input Capacitor:

The recommended input capacitance is determined by 1.0

ampere minimum ripple current rating and 330µF minimum

capacitance (300µF for Oscon® or low ESR tantalum).

Ripple current and <100mΩ equivalent series resistance

(ESR) values are the major considerations, along with tem-

perature, when designing with different types of capacitors.

Tantalum capacitors have a recommended minimum voltage

rating of twice the maximum DC voltage + AC ripple. This

is necessary to insure reliability for input voltage bus appli-

cations

Capacitor Table

Table 1 identifies the characteristics of capacitors from a

number of vendors with acceptable ESR and ripple current

(rms) ratings. The number of capacitors required at both the

input and output buses is identified for each capacitor type.

Output Capacitors: Co₁/Co₂

The ESR of the required capacitors, Co₁& Co₂must not be

greater than 150mΩ. Electrolytic capacitors have poor

ripple performance at frequencies greater than 400kHz

but excellent low frequency transient response. Above the

ripple frequency, ceramic capacitors are necessary to improve

the transient response and reduce any high frequency noise

components apparent during higher current excursions.

Preferred low ESR type capacitor part numbers are identified

in Table 1.

This is not an extensive capacitor list. Capacitors from other

vendors are available with comparable specifications. Those listed

are for guidance. The RMS ripple current rating and ESR

(Equivalent Series Resistance at 100kHz) are critical parameters

necessary to insure both optimum regulator performance and

long capacitor life.

Table 1: Input/Output Capacitors

Capacitor

Vendor/

Capacitor Characteristics

Quantity

Component

Series

Working

Voltage

(ESR) Equivalent

Series Resistance

85°C Maximum Ripple

Current(Irms)

Physical

Size(mm)

Input

Bus

Output

Bus

Value(µF)

Vendor Number

Panasonic

FC

25V

35V

560µF

390µF

330µF

0.0065Ω

0.065Ω

0.117Ω

1205mA

555mA

12.5x15

8x11.5

1

2

N/R

1

EEUFC1E561S

EEUFC1V391S

EEUFC1C331

United

16V

35V

10V

20V

330µF

470µF

330µF

150µF

0.120Ω

0.052Ω

0.025Ω

555mA

1220mA

3500mA

3200mA

8x12

10x20

10x10.5

N/R

1

2

LXZ16VB331M8X12LL

LXZ35VB471M10X20LL

10FS330M

Chemi-Con

LXV/FS/

LXZ

1

2

0.030÷2 Ω

20FS150M

35V

50V

560µF

330µF

470µF

0.048Ω

0.065÷2 Ω

0.046Ω

1360mA

1020mA

1470mA

16x15

12.5x15

18x15

1

UPL1V561MHH6

UPL1V331MHH6

UPM1H4711MHH6

Nichicon

PL/ PM

Panasonic

FC

(Surface Mtg)

10V

35V

16V

1000µF

330µF

0.043Ω

0.065Ω

0.150Ω

1205mA

670mA

12x16.5

12.5x16

10x10.2

1

N/R

1

EEVFC1A102LQ

EEVFC1V331LQ

EEVFC1C331P

Oscon- SS

SV

10V

20V

330µF

150µF

0.025Ω

0.024÷2 Ω

>3500mA

>3800mA

3600mA

10.0x10.5

10.3x10.3

1

2

1

2

10SS330M

10SV300M

20SV150M

SV= Surface Mount

AVX

Tantalum

TPS

10V

330µF

220µF

0.100÷2 Ω

0.095Ω

>2500mA

>3000mA

>2000mA

7.3Lx

4.3Wx

4.1H

2

1

2

TPSV337M010R0100

TPSV337M010R0060

TPSV227M0105R0100

Kemet

T510/

T495

10V

330µF

220µF

0.033Ω

0.07Ω÷2 =0.035Ω

1400mA

>2000mA

7.3Lx5.7W

x 4.0H

2

1

2

T510X337M010AS

T495X227M010AS

7.3Lx

6.0Wx

4.1H

Sprague

594D

10V

330µF

220µF

0.045Ω

0.065Ω

2350mA

>2000mA

2

1

2

4D337X0010R2T

594D227X0010D2T

N/R –Not recommended. The voltage ratingdoes not meet the minimum operating limits.

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6940 Series

Adjusting the Output Voltages of the

PT6940 Dual-Output ISRs

Each output voltage from the PT6940 series of integrated

switching regulators (ISRs) can be independently adjusted

higher or lower than the factory trimmed pre-set voltage.

The voltages, Vo₁and Vo₂may each be adjusted either up

or down using a single external resistor . Table 1 gives the

adjustment range for both Vo₁and Vo₂for each model in

Where: V_o= Original output voltage, (Vo₁or Vo₂)

V_a= Adjusted output voltage

R_s= The series resistance from Table 1

1

Notes:

1.Use only

a

single 1% resistor in eit(hRer) otrhRe₂

1

location to adjust Vo₁, and in the (R₃) or R₄location to

adjust Vo₂. Place the resistor as close to the module as

possible.

the series as V_a(min) and V_a(max). Note that Vo₂must

2

always be lower than Vo₁

.

Vo₁Adjust Up: To increase the output, add a resistor R₂

3

between pin 2 (Vo₁Adjust) and pins 7-12 (GND) .

2.Vo ₂must always be at least 0.3V lower than Vo₁.

Vo₁Adjust Down: Add a resistor (R₁), between pin 2

(Vo₁Adjust) and pin 3 (Vo₁Sense).

3.When adjusting Vohigher than the factory pre-set

1

output voltage the minimum input voltage must be

revised as follows.

Vo₂Adjust Up: Add a resistor R₄between pin 27

(Vo₂Adjust) and pins 17–22 (GND).

Vo₁=3.3V:

V_in(min) = (Vo₁+ 1)V or 4.5V, whichever is greater.

Vo₂Adjust Down: Add a resistor (R₃) between pin 27

(Vo₂Adjust) and pin 26 (Vo₂Sense).

Vo₁=2.5V:

Vo₁=2.5V is the maximum output voltage allowed for

operation off a 3.3V input bus. If Vo₁is adjusted above

2.5V, the input voltage must be a minimum of 4.5V.

Refer to Figure 1 and Table 2 for both the placement and value of

the required resistor.

4.Vo ₁and Vo₂may be adjusted down to an alternative bus

voltage by making, (R₁) or (R₃) respectively, a zero ohm

link. Refer to the Table 1 footnotes for guidance.

The adjust up and adjust down resistor values can also be

calculated using the following formulas. Be sure to select

the correct formula parameter from Table 1 for the output

and model being adjusted.

5.Never connect capacitors to either theAdVjuost or

1

Vo₂Adjust pins. Any capacitance added to these control

pins will affect the stability of the respective regulated

output.

10 (V_a– 0.9 )

V_o– V_a

(R₁) or (R₃)

=

– R_s

kΩ

9

R₂or R₄

=

– R_s

kΩ

V_a– V_o

Figure 1

Vo₁Sense

Vo₂Sense

3

26

V₁Sns

V₂Sns

Vo₁

4–6

Vo₁

Vo₂

V_IN

13–16

Vin

PT6940

Vo₂

23–25

V₂Adj V₁Adj

27

7–12

17–22

2

(R1)

(R3)

+

C_IN

Co₁

Co₂

L

O

A

D

L

O

A

D

R2

R4

GND

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6940 Series

Table 1

ADJUSTMENT RANGE AND FORMULA PARAMETERS

Vo₁Bus

Vo₂Bus ⁽²⁾

PT6941

(R3)/R4

Series Pt #

Adj. Resistor

PT6941/42/43/44

(R1)/R2

PT6946/47/48

(R1)/R2

PT6942/46

(R3)/R4

PT6943/47

(R3)/R4

PT6944/48

(R3)/R4

V_o(nom)

Va(min)

Va(max)

R_s(kΩ)

3.3V

2.5V

1.8V

1.5V

1.2V

1.15V

1.5V †

29.4

*

2.5V

1.8V

1.5V

1.2V

3.5V

20.0

2.5V

13.0

3.1V

13.0

2.2V

20.0

2.4V

10.0

Ref. Note 4:

* (R1) = Zero-ohm link

†(R3) = Zero-ohm link

Table 2

ADJUSTMENT RESISTOR VALUES

Vo₁Bus

Vo₂Bus

Series Pt #

Adj. Resistor

PT6941/42/43/44

(R1)/R2

PT6946/47/48

(R1)/R2

Series Pt #

Adj. Resistor

PT6941

(R3)/R4

PT6942/46

(R3)/R4

PT6943/47

(R3)/R4

PT6944/48

(R3)/R4

V_o(nom)

3.3V

2.5V

V_o(nom)

2.5V

1.8V

1.5V

1.2V

V_a(req’d)

1.15

(20.6)kΩ

1.8

(0.0)

1.2

1.25

1.3

1.35

1.4

1.45

1.5

1.55

1.6

1.65

1.7

1.75

1.8

1.85

1.9

1.95

2.0

2.05

2.1

2.15

2.2

2.25

2.3

2.35

2.4

2.45

2.5

(0.0)kΩ

(4.0)kΩ

(10.0)kΩ

(20.0)kΩ

(40.0)kΩ

(100.0)kΩ

1.85

1.9

1.95

2.0

2.05

2.1

2.15

2.2

2.25

2.3

2.35

2.4

2.45

2.5

2.55

2.6

2.65

2.7

2.75

2.8

2.85

2.9

2.95

3.0

(1.6)kΩ

(3.7)kΩ

(6.1)kΩ

(9.0)kΩ

(12.6)kΩ

(17.0)kΩ

(22.7)kΩ

(30.3)kΩ

(41.0)kΩ

(57.0)kΩ

(83.7)kΩ

(137.0)kΩ

(297.0)kΩ

151.0kΩ

60.6kΩ

30.6kΩ

15.6kΩ

6.6kΩ

(0.0)kΩ

(6.0)kΩ

(15.0)kΩ

(30.0)kΩ

(60.0)kΩ

(150.0)kΩ

0.0kΩ

170.0kΩ

80.0kΩ

50.0kΩ

35.0kΩ

26.0kΩ

19.6kΩ

15.7kΩ

12.5kΩ

10.0kΩ

8.0kΩ

6.4kΩ

5.0kΩ

3.9kΩ

2.9kΩ

2.0kΩ

1.3kΩ

0.6kΩ

0.0kΩ

(0.0)kΩ

(1.6)kΩ

(3.7)kΩ

(6.1)kΩ

(9.0)kΩ

(12.6)kΩ

(17.0)kΩ

(22.7)kΩ

(30.3)kΩ

(41.0)kΩ

(57.0)kΩ

(83.7)kΩ

(137.0)kΩ

(297.0)kΩ

160.0kΩ

70.0kΩ

40.0kΩ

25.0kΩ

16.0kΩ

10.0kΩ

5.7kΩ

(0.0)kΩ

(2.0)kΩ

(4.3)kΩ

167.0kΩ

77.0kΩ

47.0kΩ

32.0kΩ

23.0kΩ

#

(6.9)kΩ

(10.0)kΩ

(13.6)kΩ

(18.0)kΩ

(23.3)kΩ

(30.0)kΩ

(38.6)kΩ

(50.0)kΩ

(90.0)kΩ

(210.0)kΩ

2.5kΩ

3.1

3.2

3.3

2.55

2.6

2.65

2.7

2.75

2.8

2.85

2.9

167.0kΩ

77.0kΩ

47.0kΩ

32.0kΩ

23.0kΩ

17.0kΩ

12.7kΩ

9.5kΩ

3.4

3.5

3.6

3.7

70.0kΩ

25.0kΩ

10.0kΩ

2.5kΩ

2.95

3.0

7.0kΩ

5.0kΩ

3.1

2.0kΩ

R₁/R₃= (Blue), R₂/R₄= Black

# See Note 3

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型号：	PT6942N
厂家：	TEXAS INSTRUMENTS
描述：	SMPS Controller SMPS控制器\n 控制器
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