ROHM BH6578FVM Technical data

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

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

BH6578FVM BD7931F

Ratings

Range

No.11008EBT05

Unit

Supply voltage Vcc 4.5~5.5 4.5～ 14 V

●Truth table

BH6578FVM,BD7931F

INPUT OUTPUT

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

www.rohm.com

Function

1/8

2011.05 - Rev.B

BH6578FVM,BD7931F

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

Parameter Symbol

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

Min. Typ. Max.

Limits.

Unit Conditions

Technical Note

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

Standby current

Supply current 1

Supply current 2

(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

ICC1 - 0 5 µA

ICC2 - 1.1 2.2 mA

ICC3 - 0.8 1.6 mA

Min. Typ. Max.

Limits.

Unit Conditions

FIN=5V,RIN=0V

FIN=RIN=5V

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

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

www.rohm.com

2/8

2011.05 - Rev.B

BH6578FVM,BD7931F

]

Technical Note

●Reference data

0.4

0.3

0.2

Loss voltage[V

0.1

85℃ 25℃

-35℃

0.0

0 100 200 300 400 500

Load cur r ent[mA]

0.4

85℃ 25℃

0.3

-35℃

0.2

Loss voltage[V

0.1

0.0

0 100 200 300 400 500

Load cur rent[mA]

Output voltage[

012345

Input voltag e : LDC ONT[V]

-35℃ 25℃ 85℃

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

0.0

-0.1

-0.2

Loss voltage[V

-35℃

-0.3

25℃ 85℃

-0.4

0 100 200 300 400 500

Load cur rent[mA]

0.0

-0.1

-0.2

Loss voltage[V

-35℃

-0.3

25℃ 85℃

-0.4

0 100 200 300 400 500

Load cur rent[mA]

-1

-2

-3

Output voltage[

-4

-5 01 23 45

Input voltag e : LDC ONT[ V]

85℃ 25℃

-35℃

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

0.4

0.3

0.2

Loss voltage[V

0.1

85℃ 25℃

-35℃

0.0

0 100 200 300 400 500

Load cur rent[mA]

0.4

85℃ 25℃

-35℃

0.3

0.2

Loss voltage[V

0.1

0.0 0 100 200 300 400 500

Load cur rent[mA]

Output voltage[

012 345

Input voltag e : LDC ONT[V]

-40℃ 25℃ 85℃

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

0.0

-0.1

-0.2

Loss voltage[V

-0.3

40℃ 25℃ 85℃

-0.4

0 100 200 300 400 500

Load cur rent[mA]

-0.1

-0.2

Loss voltage[V

40℃

-0.3

25℃ 85℃

-0.4

0 100 200 300 400 500

Load cur rent[mA]

-2

-4

-6

Output voltage[

-8

-10 012345

Input voltag e : LDC ONT[ V]

85℃ 25℃

-40℃

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

www.rohm.com

3/8

2011.05 - Rev.B

+ 6 hidden pages