BH6717NUV-E2 [ROHM]

Motion Control Electronic, PDSO10,;


型号：	BH6717NUV-E2
厂家：	ROHM
描述：	Motion Control Electronic, PDSO10, 光电二极管
文件：	总11页 (文件大小：394K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DC Brushless Motor Drivers for Cooling Fans

Three-Phase Full-Wave

Fan Motor Driver for Note PC

BH6717NUV

No.12010EAT18

●Description

BH6717NUV is a three-phase sensorless fan motor driver used to cool off notebook PCs. It is controlled by a variable

speed provided through the PWM input signal. Its feature is sensorless drive which doesn’t require a hall device as a

location detection sensor and motor downsizing can be achieved by limiting the number of external components as much

as possible. Furthermore, introducing a direct PWM soft switched driving mechanism achieves silent operations and low

vibrations.

●Features

1) Speed controllable by PWM input signal

2) Sensorless drive

3) Soft switched drive

4) Power save function

●Applications

small fan motor notebook PCs etc

●Absolute maximum ratings(Ta=25C)

Parameter

Supply voltage

Symbol

VCC

Ratings

−0.3～6.5

560 *

Unit

Power dissipation

C

Operating temperature

Storage temperature

Output current

Topr

-25～+95

-55～+125

700 **

6.5

Tstg

C

Iomax

VFG

IFG

FG signal output voltage

FG signal output current

Junction temperature

C

Tjmax

125

Reduce by 5.6mW/C over 25/C. (On 70mm×70mm×1.6mm glass epoxy board)

** This value is not to exceed Pd.

●Operating conditions

Parameter

Symbol

VCC

Ratings

Unit

Operating supply voltage range

1.8 ～ 5.5

*These specifications might change for their improvement etc.

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2012.03 - Rev.A

1/10

Technical Note

BH6717NUV

●Electrical characteristics(Unless otherwise specified VCC=5V, Ta=25C)

Limits

Parameter

Symbol

Unit

Conditions

Min.

Typ.

Max.

Circuit current STB

Circuit current

μA

ICST

ICC

PWM input H level

PWM input L level

PWM input current H

PWM input current L

Input frequency

VPH

VPL

IPH

2.5

VCC

0.7

μA

kHz

PWM=VCC

PWM=GND

IPL

-50

4.5

-20

FR input H level

FR input L level

VFRH

VFRL

TPO

VLM

VCC

0.5

2000

0.3

0.325

0.4

FR=H : Reverse drive

FR=L : Forward drive

PWM off time

μs

500

0.2

1000

0.25

Limit voltage

Output voltage

Io＝250mA (H.L. total)

IFG＝5mA

FG low voltage

VFGL

LDT

LRT

RLT

Lock protection det.time

Lock protection rel.time

Lock protection ratio

0.5

2.5

rel.time/det.time ratio

●Package outlines (Unit：mm)

Package : VSON010V3030

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2012.03 - Rev.A

2/10

Technical Note

BH6717NUV

●Block diagram

OSC : Oscillation circuit TSD : Thermal shutdowm（heat rejection circuit） Pre : Pre driver

UVLO : Under voltage lock out circuit BEMF Det : Induced electromotive voltage detection circuit

Det Level : Offset circuit

*1 Open collector output. A pull-up resistances of 10kΩ should be inserted.

*2 The wiring patterns from the VCC terminal and GND terminal to the bypass capacitor must be routed

as short as possible. With respect to the wiring pattern, It has been confirmed that 0.03Ω for 1uF at the bypass

capacitor doesn’t cause problems under our operation environment.

This can be used as a reference value to check for validity.

*3 Be careful with the wattage because a large current may pass through the output current detection resistance.

The current limit value is determined by the internal limit voltage value (typ.0.25V) and the output current detection

resistance (See Description of Functional Operation 3.). Accordingly, the resistance of the wiring pattern routed from

the RNF terminal and GND terminal to the output current detection resistance also affects to the current limit value,

and therefore the resistance of the wiring pattern should be as small as possible.

*4 When it is noisy, Capacitance should be inserted between U,V,and W,.

●Pin assignment

Pin No.

Terminal name

Function

FG output terminal

COM

VCC

Coil midpoint terminal

Power supply terminal

U phase output terminal

Current limit detection terminal

W phase output terminal

V phase output terminal

GND terminal

RNF

GND

Forward/Reverse switch terminal

PWM signal input terminal

PWM

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2012.03 - Rev.A

3/10

Technical Note

BH6717NUV

●Description of Function Operation

1.Sensorless Drive

BH6717NUV is a motor driver IC for driving a three-phase brushless DC motor without a hall sensor.Detecting

a rotor location firstly at startup, an appropriate logic for the rotation direction is obtained using this information

and given to each phase to rotate the motor. Then, the rotation of the motor induces electromotive

voltage in each phase wiring and the logic based on the induced electromotive voltage is applied to the each

phase to continue rotating.

2. Lock Protection Feature, Automatic Recovery Circuit

To prevent passing a coil current on any phase when a motor is locked, it is provided with a function

which can turn OFF the output for a certain period of time and then automatically restore itself to the normal

operation. During the motor rotation, an appropriate logic based on the induced electromotive voltage can be

continuously given to each phase ; on the other hand, when the motor is locked, no induced electromotive voltage

is obtained. Utilizing this phenomenon to take a protective against locking, when the induced electromotive

voltage is not detected for a predetermined period of time (TON), it is judged that the motor is locked and the

output is turned OFF for a predetermined period of time (TOFF).In Fig.1, the timing chart is shown.

Motor unlock

Motor lock

Induced electromotive

voltage detection

Not

Detecting

Recover to the

normal operation

TON

TOFF

OFF

Output

Fig.1

3. Current limit circuit

A current passing through the motor coil can be detected on the output current detection resistance to prohibit a current

flow larger than a current limit value. The current limit value is determined by settings of the IC internal limit voltage:

0.25V (typ.) and the output current detection resistance value using the following equation:

Internal limit voltage(0.25V )

Current limit value(mA)ꢀ＝

Output current detection resistance(Ω)

For example the RNF resistance is 0.5Ω, the current limit is activated at 500mA by calculation.

4. UVLO（Under voltage lock out circuit）

In the operation area under the guaranteed operating power supply voltage of 1.8V (typ.), the transistor

on the output can be turned OFF at a power supply voltage of 1.58V (typ.). A hysteresis width of 100mV is provided

and a normal operation can be performed at 1.68V. This function is installed to prevent unpredictable operations, such

as a large amount of current passing through the output, by means of intentionally turning OFF the output during an

operation at a very low power supply voltage which may cause an abnormal function in the internal circuit.

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2012.03 - Rev.A

4/10

Technical Note

BH6717NUV

5. Power saving function / Speed control by PWM input

The power saving function is controlled by an input logic of the PWM terminal.

(a) Operate mode when the PWM terminal is High.

(b) Standby mode when the PWM terminal is Low for a time period of 1ms (typ.).

When the PWM terminal is open, High logic is set.

Input logic of the PWM terminal is set at Low and then the Standby mode becomes effective 1ms (typ.) (Fig.2).

In the Standby mode, the lock protection function is deactivated and the lock protection is not effective. Therefore, this

device can start up instantly even from the stop state when the input logic of the PWM terminal is set at High.

PWM

1ms

Power saving

function

normal mode

standbyꢀmode

normal mode

OFF

Output

Lock protection

function

active

inactive

Fig.2

・Speed Control by PWM input

Depending on the Duty value of the input signal on the PWM terminal, the output is controlled by switching

between ON and OFF. The higher Duty value results in the higher motor rotation speed, while the lower Duty

value the lower speed.

6. U,V,W phase and FG output signals

In Fig.3, the timing charts of the output signals from the U, V and W phases as well as the FG terminal is shown.

Assuming that a three-slot tetrode motor is used, two pulse outputs of FG are produced for one motorcycle.

The three phases are excited in the order of U, V and W phases.

U phase

voltage

V phase

voltage

W phase

voltage

Fig.3

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2012.03 - Rev.A

5/10

Technical Note

BH6717NUV

●Equivalent circuit

VCC

20Ω

12kΩ

30k Ω

COM

PWM

VCC

GND

VCC VCC

250k Ω

2kΩ

10kΩ

2kΩ

U, V, W, RNF

VCC

2kΩ

GND

VCC

10kΩ

10k Ω

10kΩ

12kΩ

2kΩ

12kΩ

RNF

GND

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2012.03 - Rev.A

6/10

Technical Note

BH6717NUV

●Thermal derating curve

Permissible dissipation (total loss) indicates the power that can be consumed by IC at Ta = 25ºC (normal temperature). IC is

heated when it consumes power, and the temperature of IC chip becomes higher than ambient temperature. The

temperature that can be accepted by IC chip depends on circuit configuration, manufacturing process, etc, and consumable

power is limited. Permissible dissipation is determined by the temperature allowed in IC chip (maximum junction

temperature) and thermal resistance of package (heat dissipation capability). The maximum junction temperature is in

general equal to the maximum value in the storage temperature range.

Heat generated by consumed power of IC is radiated from the mold resin or lead frame of package. The parameter which

indicates this heat dissipation capability (hardness of heat release) is called heat resistance, represented by the symbol θja

[C/W]. The temperature of IC inside the package can be estimated by this heat resistance. Below Figure shows the model

of heat resistance of the package.

Heat resistance θja, ambient temperature Ta, junction temperature Tj, and power consumption P can be calculated by the

equation below:

θja = (Tj－Ta) / P

[℃/W]

Thermal derating curve indicates power that can be consumed by IC with reference to ambient temperature. Power that can

be consumed by IC begins to attenuate at certain ambient temperature. This gradient is determined by thermal resistance

θja.

Thermal resistance θja depends on chip size, power consumption, package ambient temperature, packaging condition,

wind velocity, etc even when the same package is used. Thermal derating curve indicates a reference value measured at a

specified condition. Below Figure shows a thermal derating curve. (Value when mounting FR4 glass epoxy board 70 [mm] x

70 [mm] x 1.6 [mm] (copper foil area below 3 [%]))

θja = (Tj-Ta) / P [℃/W]

Ambient temperature Ta [ºC]

Chip surface temperature Tj [ºC]]

Power consumption P[W]

Thermal resistance

Pd(mW

)

750

600

560

450

300

150

95 100

125

150

Ta( )

℃

＊

Above Ta = 25ºC, derating by 5.6 mW/ºC

(When glass epoxy board of 70.0 mm x 70.0 mm x 1.6 mm is mounted)

Thermal derating curve

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2012.03 - Rev.A

7/10

Technical Note

BH6717NUV

●Note for contents

1) To explain about function of operation, timing charts might be partly omitted.

●Location of IC (Generally three-phase sensorless driver IC)

1) Generally, three-phase sensorless driver is rotated motor by detecting the induced electromotive voltage.Line noise, line

resistance is influenced for detecting the induced electromotive voltage.From motor to IC line should be shorted, its

suggest that location of IC is on the board of Motor in below Fig.4.

2) In three-phase sensorless and variable speed driver, It is necessary to tuning motor and IC (each motor units).

(Usually Motor maker does it to tuning motor and IC.)

Motor

Board

Fig.4

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2012.03 - Rev.A

8/10

Technical Note

BH6717NUV

●Cautions on use

1) Absolute maximum ratings

An excess in the absolute maximum rations, such as supply voltage, temperature range of operating conditions, etc.,

can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit.

If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices,

such as fuses.

2) Connecting the power supply connector backward

Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the power supply

lines. An external direction diode can be added.

3) Power supply line

Back electromotive force causes regenerated current to power supply line, therefore take a measure such as placing a

capacitor between power supply and GND for routing regenerated current. And fully ensure that the capacitor

characteristics have no problem before determine a capacitor value. (when applying electrolytic capacitors, capacitance

characteristic values are reduced at low temperatures)

4) GND potential

The potential of GND pin must be minimum potential in all operating conditions. Also ensure that all terminals except

GND terminal do not fall below GND voltage including transient characteristics. However, it is possible that the motor

output terminal may deflect below GND because of influence by back electromotive force of motor. Malfunction may

possibly occur depending on use condition, environment, and property of individual motor. Please make fully

confirmation that no problem is found on operation of IC.

5) Thermal design

Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating

conditions.

6) Inter-pin shorts and mounting errors

Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any

connection error or if pins are shorted together.

7) Actions in strong electromagnetic field

Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to

malfunction.

8) ASO

When using the IC, set the output transistor so that it does not exceed absolute maximum rations or ASO.

9) Thermal shut down circuit

The IC incorporates a built-in thermal shutdown circuit (TSD circuit). Operation temperature is 150℃(Typ.) and has a

hysteresis width of 15℃(Typ.). When IC chip temperature rises and TSD circuit works, the output terminal becomes an

open state. TSD circuit is designed only to shut the IC off to prevent thermal runaway. It is not designed to protect the IC

or guarantee its operation. Do not continue to use the IC after operation this circuit or use the IC in an environment

where the operation of this circuit is assumed.

10) Testing on application boards

When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to

stress. Always discharge capacitors after each process or step. Always turn the IC’s power supply off before connecting

it to or removing it from a jig or fixture during the inspection process. Ground the IC during assembly steps as an

antistatic measure. Use similar precaution when transporting or storing the IC.

11) GND wiring pattern

When using both small signal and large current GND patterns, it is recommended to isolate the two ground patterns,

placing a single ground point at the ground potential of application so that the pattern wiring resistance and voltage

variations caused by large currents do not cause variations in the small signal ground voltage. Be careful not to change

the GND wiring pattern of any external components, either.

12) IC terminal input

When VCC voltage is not applied to IC, do not apply voltage to each input terminal. When voltage above VCC or below

GND is applied to the input terminal, parasitic element is actuated due to the structure of IC. Operation of parasitic

element causes mutual interference between circuits, resulting in malfunction as well as destruction in the last. Do not

use in a manner where parasitic element is actuated.

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2012.03 - Rev.A

9/10

Technical Note

BH6717NUV

●Physical Dimension

VSON010V3030

3.0 0.1

Tape

Embossed carrier tape

3000pcs

Quantity

1PIN MARK

Direction

of feed

The direction is the 1pin of product is at the upper left when you hold

reel on the left hand and you pull out the tape on the right hand

(

)

0.08

2.0 0.1

0.5

C0.25

+0.05

0.5

Direction of feed

1pin

0.25

0.04

Reel

(Unit : mm)

Order quantity needs to be multiple of the minimum quantity.

∗

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2012.03 - Rev.A

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Notice

N o t e s

No copying or reproduction of this document, in part or in whole, is permitted without the

consent of ROHM Co.,Ltd.

The content speciﬁed herein is subject to change for improvement without notice.

The content speciﬁed herein is for the purpose of introducing ROHM's products (hereinafter

"Products"). If you wish to use any such Product, please be sure to refer to the speciﬁcations,

which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein

illustrate the standard usage and operations of the Products. The peripheral conditions must

be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information speciﬁed in this document.

However, should you incur any damage arising from any inaccuracy or misprint of such

information, ROHM shall bear no responsibility for such damage.

The technical information speciﬁed herein is intended only to show the typical functions of and

examples of application circuits for the Products. ROHM does not grant you, explicitly or

implicitly, any license to use or exercise intellectual property or other rights held by ROHM and

other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the

use of such technical information.

The Products speciﬁed in this document are intended to be used with general-use electronic

equipment or devices (such as audio visual equipment, ofﬁce-automation equipment, commu-

nication devices, electronic appliances and amusement devices).

The Products speciﬁed in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a

Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard

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The Products are not designed or manufactured to be used with any equipment, device or

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More detail product informations and catalogs are available, please contact us.

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R1120

BH6717NUV-E2 [ROHM]

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