BD7931F - ROHM Co., Ltd. - Product.Network

1/8

www.rohm.com 2011.05 - Rev.B

Reversible Motor Drivers for Brush Motors

0.5A or Less Reversible

Motor Drivers (Single Moter)

BH6578FVM,BD7931F

●Description

The BH6578FVM and BD7931F are reversible motor drivers with a wide output dynamic range, with power MOS used for the

output transistor. The motor drivers can set the output mode to four modes of normal rotation, reverse rotation, stop (idling),

and braking in accordance with input logic (2 inputs).

●Features

1) Wide dynamic range loading driver with MOS output, Ron = 1.0 (Top+Bottom)

2) With loading driver voltage setting terminal

3) Built-in thermal shutdown circuit (TSD)

4) MSOP8 package (BH6578FVM)

5) SOP8 package (BD7931F)

●Applications

Tray loading of CD/DVD, applications using DC motors

●Absolute maximum ratings (Ta=25℃)

Parameter Symbol Ratings Unit

BH6578FVM BD7931F

Supply Voltage Vcc 7 15 V

Power dissipation Pd 0.55 * 0.69** W

Operating temperature Topr -35～+85 -40～85 ℃

Storage temperature Tstg -55～+150 ℃

Output current Iout 500 mA

Junction temperature Tjmax 150 ℃

* When 70 mmx70 mmx1.6 mm thick glass epoxy substrate with less than 3% copper foil occupancy ratio is mounted.

When used at Ta=25°C or higher, derated at 4.4 mW/°C.

** When 70 mmx70 mmx1.6 mm thick glass epoxy substrate with less than 3% copper foil occupancy ratio is mounted.

When used at Ta=25°C or higher, derated at 5.5 mW/°C.

●Recommended operating range

Parameter Symbol Range Unit

BH6578FVM BD7931F

Supply voltage Vcc 4.5~5.5 4.5～14 V

●Truth table

BH6578FVM,BD7931F

INPUT OUTPUT

Function

INFWD INREV OUT+ OUT-

L L Hi Z Hi Z High Impedance

L H L H REV mode

H L H L FWD mode

H H L L Brake mode

Hiz：Hi-impedance

No.11008EBT05

BH6578FVM,BD7931F

Technical Note

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www.rohm.com 2011.05 - Rev.B

●Electrical characteristics

BH6578FVM(Unless otherwise specified, Ta=25℃, Vcc=5V)

Parameter Symbol

Limits. Unit Conditions

Min. Typ. Max.

Standby current ICC1 - 0.4 0.8 mA No load

(Loading Driver)

Output offset voltage VOFSL -15 0 +15 mV Brake mode

Input threshold voltage H VIH 2.0 － Vcc V

Input threshold voltage L VIL GND － 0.5 V

ON resistance RON － 1.0 1.8  Io=500mA,Top+Bottom

Voltage gain (Loading) GVLD 4.5 6.0 7.5 dB *1

Voltage gain difference (Loading) GVLD -2.0 0 2.0 dB

Input bias current IINL － 86 120 µA FIN=5V,RIN=5V

LDCONT bias current ILDC －－ 300 nA CONT=2V

* No radiation-resistant design is adopted for the present product.

*1. Let V01 denote output-to-output voltage when CONT=1V and V02 denote output-to-output voltage

when CONT=3.5V, voltage gain can be expressed by the following equation:GVLD=20log|(V02-V01)/2.5|

BD7931F(Unless otherwise specified, Ta=25℃, Vcc=8V)

Parameter Symbol Limits. Unit Conditions

Min. Typ. Max.

Standby current ICC1 - 0 5 µA

Supply current 1 ICC2 - 1.1 2.2 mA

FIN=5V,RIN=0V

Supply current 2 ICC3 - 0.8 1.6 mA

FIN=RIN=5V

(Loading Driver)

Output offset voltage VOFSL -35 0 +35 mV Brake mode

Input threshold voltage H VIH 2.0 － Vcc V

Input threshold voltage L VIL GND － 0.5 V

ON resistance RON － 1.0 1.8  Io=500mA,Top+Bottom

Voltage gain (Loading) GVLD 4.0 6.0 8.0 dB *2

Voltage gain difference (Loading) GVLD -2.0 0 2.0 dB

Input bias current IINL － 165 250 µA FIN=5V,RIN=5V

LDCONT bias current ILDC －－ 300 nA CONT=5V

* No radiation-resistant design is adopted for the present product.

*1. Let V01 denote output-to-output voltage when CONT=1V and V02 denote output-to-output voltage when CONT=3.5V, voltage gain can be expressed by

the following equation:GVLD=20log|(V02-V01)/2.5|

BH6578FVM,BD7931F

Technical Note

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www.rohm.com 2011.05 - Rev.B

0.0

0.1

0.2

0.3

0.4

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

85℃

25℃

-35℃

0.0

0.1

0.2

0.3

0.4

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

85℃

25℃

-35℃

012345

Input voltag e : LD CONT[V]

Output voltage[

-35℃

25℃

85℃

0.0

0.1

0.2

0.3

0.4

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

0.0

0.1

0.2

0.3

0.4

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

012 345

Input voltag e : LD CONT[V]

Output voltage[

-0.4

-0.3

-0.2

-0.1

0.0

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

-0.4

-0.3

-0.2

-0.1

0.0

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

-35℃

25℃

85℃

-0.4

-0.3

-0.2

-0.1

0.0

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

-0.4

-0.3

-0.2

-0.1

0.0

0 100 200 300 400 500

Load current[mA]

Loss voltage[V

]

-10

-8

-6

-4

-2

012345

Input voltag e : LDCONT[V]

Output voltage[

-5

-4

-3

-2

-1

01 23 45

Input voltag e : LDCONT[V]

Output voltage[

40℃

25℃

85℃

-40℃

25℃

85℃

25℃

-40℃

●Reference data

Fig.1 Output loss voltage L(BH6578FVM) Fig.2 Output loss voltage L(BH6578FVM) Fig.3 Voltage gain(BH6578FVM)

Vcc=5V, CONT=OPEN Vcc=5V, CONT=OPEN Vcc=5V, CONT=SWEEP

FWD mode REV mode RL=8Ω+47µH

Fig.4 Output loss voltage H(BH6578FVM) Fig.5 Output loss voltage H(BH6578FVM) Fig.6 Voltage gain (BH6578FVM)

Vcc=5V, CONT=OPEN Vcc=5V, CONT=OPEN Vcc=5V, CONT=SWEEP

FWD mode REV mode RL=8Ω+47µH

Fig.7 Output loss voltage L(BD7931F) Fig.8 Output loss voltage L(BD7931F) Fig.9 Voltage gain (BD7931F)

Vcc=8V, CONT=OPEN Vcc=8V, CONT=OPEN Vcc=8V, CONT=SWEEP

FWD mode REV mode RL=20Ω+47µH

Fig.10 Output loss voltage H(BD7931F) Fig.11 Output loss voltage H(BD7931F) Fig.12 Voltage gain(BD7931F)

Vcc=8V, CONT=OPEN Vcc=8V, CONT=OPEN Vcc=8V, CONT=SWEEP

FWD mode REV mode RL=20Ω+47µH

-35℃

25℃

85℃

25℃

-35℃

85℃

25℃

-35℃

85℃

25℃

-35℃

40℃

25℃

85℃

BH6578FVM,BD7931F

Technical Note

4/8

www.rohm.com 2011.05 - Rev.B

●Thermal derating curves

BH6578FVM BD7931F

*when 70 mmx70 mmx1.6 mm thick glass epoxy substrate with less than 3% copper foil occupancy ratio is mounted.

●Block diagram, applied circuit diagram example

BH6578FVM, BD7931F (in common)

T. S . D : Thermal shutdown

Fig.13

●Pin descriptions

Pin No. Pin Name Function Pin No. PinName Function

1 Vcc Supply voltage 5 GND_S Signal ground

2 OUT+ FWD output 6 LDCONT Loading driver voltage setting pin

3 OUT- REV output 7 INREV REV input

4 GND Power ground 8 INFWD FWD input

MBIENT TEMPERATURE : Ta [℃]

025 50 75 100 125 150

0.2

0.4

0.6

175

0.8

Pd [W]

Pd : Power Dissipation

0 25 50 75 100 125 150

0.2

0.4

0.6

Pd [W]

175

MBIENT TEMPERATURE : Ta [℃]

Pd : Power Dissipation

0.8

1234

8 7 6 5

Control

Logic LDCONT

T.S . D

+ -

FWD IN REV IN LDCONT

Vcc

FRPRE

GND

POW

GND

POWG

PREGND

POW CMOS

H-Bridge

Bypass

capacitor

0.1

85 85

BH6578FVM,BD7931F

Technical Note

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●Interfaces

BH6578FVM BD7931F

Fig.14 Fig.17

Fig.15 Fig.16 Fig.18 Fig.19

●Operations

(1) CONTROL LOGIC

Operation of each mode is carried out as follows:

When INFWD is “H” and INREV is “L,” the normal rotation mode is achieved and current flows from OUT+ to OUT-.

When both INFWD and INREV are “H,” the brake mode is achieved. Operation in such event is described as follows:

the top-side transistor turns OFF to stop supplying motor drive current, the bottom-side transistor turns ON to absorb

reverse EMF of motor and applies brake to motor. When both INFWD and INREV are “L,” OUT+ and OUT- potentials

become open and the motor stops.

(2) LOADING CONT

Controlling the output voltage can vary voltage applied to the motor and can control the motor speed. By the voltage

entered to the CONT terminal, the output H voltage can be controlled (gain 6dB Typ.). Even if the voltage entered is

increased more than necessary (Vcc Max), the output voltage never exceeds the power supply voltage.

LDCONT

OUT+/OUT- FIN/RIN

LDCONT

OUT+/OUT- INFWD/INREV

50K

200K

50K

200K

VCC VCC

10K

49.6K

VCC

39K

10K

2 3

VCC

BH6578FVM,BD7931F

Technical Note

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www.rohm.com 2011.05 - Rev.B

●Notes for use

(1) Absolute maximum ratings

In the event that applied voltage (VCC, VM), working temperature range (Topr), and other absolute maximum rating are

exceeded, the IC may be destroyed. Because it is unable to identify the short-circuit mode, open mode, etc., if any

special mode is assumed, which exceeds the absolute maximum rating, physical safety measures are requested to be

taken, such as fuses, etc.

(2) Reverse connection of power supply connector

Reverse connection of power supply connector may destroy the IC. Take necessary measures to protect the IC from

reverse connection breakage such as externally inserting diodes across power supply and IC power supply terminal as

well as across power supply and motor coil.

(3) Power supply line

Because return of current regenerated by reverse EMF of a motor occurs, take necessary measures such as inserting

capacitors across the power supply and GND as a path for regenerated current, and determine the capacity value after

thoroughly confirming that there would be no problems in various characteristics such as capacitance drop at low

temperature which may occur with electrolytic capacitors.

(4) Ground potential

Keep the GND terminal potential to the minimum potential under any operating condition. In addition, check if there is

actually any terminal which provides voltage below GND including transient phenomena.

(5) Thermal design

Consider permissible dissipation (Pd) under actual working condition and carry out thermal design with sufficient margin

provided.

(6) Terminal-to-terminal short-circuit and erroneous mounting

When the present IC is mounted to a printed circuit board, take utmost care to direction of IC and displacement. In the

event that the IC is mounted erroneously, IC may be destroyed. In the event of short-circuit caused by foreign matter

that enters in a clearance between outputs or output and power-GND, the IC may be destroyed.

(7) Operation in strong electromagnetic field

The use of the present IC in the strong electromagnetic field may result in maloperation, to which care must be taken.

(8) ASO

When IC is used, design in such a manner that the output transistor to a motor does not exceed absolute maximum

ratings and ASO.

(9) Thermal shutdown circuit (TSD) (common)

When junction temperature (Tj) becomes thermal shutdown ON temperature 175°C, the thermal shutdown circuit (TSD

circuit) is activated and driver output current is shorted. There is 25°C temperature hysteresis. The thermal shutdown

protection circuit is first and foremost intended for interrupt IC from thermal runaway, and is not intended to protect and

warrant the IC. Consequently, never attempt to continuously use the IC after this circuit is activated or to use the circuit

with the activation of the circuit premised.

(10) Capacitor across output and GND

In the event a large capacitor is connected across output and GND, when Vcc and VIN are short-circuited with 0V or

GND for some kind of reasons, current charged in the capacitor flows into the output and may destroy the IC. Use a

capacitor smaller than 0.1 µF between output and GND.

(11) Inspection by set substrate

In the event a capacitor is connected to a pin with low impedance at the time of inspection with a set substrate, there is a

fear of applying stress to the IC. Therefore, be sure to discharge electricity for every process. Furthermore, when the

set substrate is connected to a jig in the inspection process, be sure to turn OFF power supply to connect the jig and be

sure to turn OFF power supply to remove the jig. As electrostatic measures, provide grounding in the assembly

process, and take utmost care in transportation and storage.

BH6578FVM,BD7931F

Technical Note

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www.rohm.com 2011.05 - Rev.B

(12) IC terminal input

The present IC is a monolithic IC and has P+ isolation and a P substrate between elements to separate elements.

With this P layer and N layer of each element, PN junction is formed, and various parasitic elements are formed.

For example, when resistors and transistors are connected to terminals as is the case of Fig.20, where in the case of

resistor, the potential difference satisfies the relation of ground (GND)>(terminal A), and in the case of transistor (NPN),

the potential difference satisfies the relation of ground (GND)>(terminal B), PN junction works as a diode.

Furthermore, in the case of transistor (NPN), a parasitic NPN transistor operates by the N-layer of other elements

adjacent to the parasitic diode. The parasitic element is inevitably formed because of the IC construction.

The operation of the parasitic element gives rise to mutual interference between circuits and results in malfunction, and

eventually, breakdown. Consequently, take utmost care not to use the IC to operate the parasitic element such as

applying voltage lower than GND (P substrate) to the input terminal.

In addition, when the power supply voltage is not applied to IC, do not apply voltage to the input terminal, either.

Similarly, when the power supply voltage is applied, each input terminals shall be the voltage below the power supply

voltage or within the guaranteed values of electrical properties.

(13) GND wiring pattern

If there are a small signal GND and a high current GND, it is recommended to separate the patterns for the high current

GND and the small signal GND and provide a proper grounding to the reference point of the set not to affect the voltage

at the small signal GND with the change in voltage due to resistance component of pattern wiring and high current. Also for

GND wiring pattern of the component externally connected, pay special attention not to cause undesirable change to it.

Resistor Transistor(NPN)

N N P+ P

P-sub

GND

Terminal A

N P+ P+

GND

C B

GND

B C

GND

Parasitic element

Fig.20 Example of the basic structure of a bipolar IC

Terminal A

Terminal B Terminal B

Parasitic element Parasitic element

Parasitic

element

P-sub

BH6578FVM,BD7931F

Technical Note

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●Operating part numer

B H 6 5 7 8 F V M - T R

Part No

6578

7931

Package

FVM : MSOP8

F : SOP8

Packaging and forming specification

E2: Embossed tape and reel

(SOP8)

TR: Embossed tape and reel

(MSOP8)

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tapeTape

Quantity

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

2500pcs

()

Direction of feed

Reel 1pin

(Unit : mm)

SOP8

0.9±0.15

0.3MIN

−

0.17 +0.1

0.05

0.595

5.0±0.2

6.2±0.3

4.4±0.2

(MAX 5.35 include BURR)

1.27

0.11

0.42±0.1

1.5±0.1

0.1 S

Direction of feed

Reel

∗

Order quantity needs to be multiple of the minimum quantity.

Embossed carrier tapeTape

Quantity

Direction

of feed

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

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

3000pcs

()

1pin

(Unit : mm)

MSOP8

0.08 S

4.0±0.2

2.8±0.1

2.9±0.1

0.475

(MAX 3.25 include BURR)

1PIN MARK

0.9MAX

0.75±0.05

0.65

0.08±0.05

0.22 +0.05

−0.04

0.6±0.2

0.29±0.15

0.145 +0.05

−0.03

4°

+6°

−4°

R1120

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