BA5956FM - ROHM Co., Ltd. - Datasheet.Directory

1/11

REV. B

STRUCTURE : Silicon Monolithic Integrated Circuit

PRODUCT SERIES : Power driver for CD/DVD player

TYPE : BA5956FM

PACKAGE OUTLINES : Figure 1

POWER DISSIPATION : Figure 2

BLOCK DIAGRAM : Figure 3

APPLICATION : Figure 4

TEST CIRCUIT : Figure 5

◎ Features

○ 2 channel current feedback type driver, 3 channel BTL driver.

○ Employs the HSOP-M36 power package for compaction.

○ Has a wide dynamic range.

○ The thermal shutdown circuit is built.

○ Mute circuit is built in. ( except for loading driver )

○ A power supply is divided into 4 systems.

【PreVcc, PowVcc1=actuator, PowVcc2=loading motor, PowVcc3=sled motor, spindle motor】

◎Absolute Maximum Rating (Ta=25℃)

Item Symbol Rating Unit

Supply voltage PreVcc,PowVcc 18 Ｖ

Power dissipation Pd 2.2*1 Ｗ

Maximum output current Iomax 1*2 Ａ

Operating temperature range Topr -35～85 ℃

Storage temperature range Tstg -55～150 ℃

*1 Rating for 70 ㎜×70 ㎜(size), 1.6 ㎜(thickness), copper foil occupation ratio less than 3％,

And use of glass-epoxy substrate.

When this IC is used above Ta=25℃, note that this rating decreases 17.6mW each time

the temperature increases 1℃.

*2 This rating of permissible dissipation must not exceed ASO.

◎Operating Supply Range

PreVcc 4.5 ～ 14 （Ｖ）

PowVcc 4.5 ～ PreVcc（Ｖ）

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REV. B

● ELECTRICAL CHARACTERISTICS

（Unless otherwise noted, Ta=25℃, PreVcc=PowVcc3=12V, PowVcc1=PowVcc2=5V, BIAS=1.65V, RL=8Ω,

Rd=0.5Ω,C=100pF）

Parameter symbol MIN TYP MAX Unit Condition Test circuit

Quiescent current IQ － 34 44

mA Figure.5

Voltage for mute ON VMON 0 － 0.5 V Figure.5

Voltage for mute OFF VMOFF 2.0 －－ V Figure.5

< Actuator driver >

Output offset current IOOF -6 0 6

mA Figure.5

Maximum output voltage VOM 3.6 4.0 － V VIN=±1.65V Figure.5

Trans conductance Gvc 1.5 1.8 2.1 A/V VIN=BIAS±0.2V Figure.5

< Sled motor driver pre OPAMP & OPAMP>

Common mode input range VICM 0.4 － 10.5 V Figure.5

Input offset voltage VIOFOP -6 0 6

mV Figure.5

Input bias current IBOP －－ 300 nA Figure.5

Low level output voltage VOLOP － 0.2 0.5 V Figure.5

Output source current ISO 0.5 －－ mA Figure.5

Output sink current ISI 0.5 －－ mA Figure.5

< Sled motor driver >

Output offset voltage VOOFSL

-50 0 50

mV Figure.5

Maximum output voltage VOMSL 8.0 9.5 － V VIN=±1.65V Figure.5

Closed loop voltage gain GVSL 17.6 19.6 21.6 dB VIN=±0.2V Figure.5

< Loading motor driver >

Output offset voltage VOOFLD

-50 0 50

mV Figure.5

Maximum output voltage VOMLD 3.5 4.0 － V VIN=±1.65V Figure.5

Gain error by polarity GVLD 15.7 17.7 19.7 dB VIN=BIAS±0.2V Figure.5

< Spindle motor driver >

Output offset voltage VOOFSP

-50 0 50

mV Figure.5

Maximum output voltage VOMS 8.0 9.5 － V VIN=±1.65V Figure.5

Gain error by polarity GVSP 15.7 17.7 19.7 dB VIN=BIAS±0.2V Figure.5

○ This product is not designed for protection against radioactive rays.

3/11

REV. B

4/11

REV. B

Electrical characteristic curves

Rating for 70mm×70mm(size), 1.6mm(thickness), copper foil occupation ratio less than 3%, and use of

glass-epoxy substrate.

Figure 2 POWER DISSIPATION

25 50 75 100 125 1500

0

1

2

3

AMBIENT TEMPERATURE, Ta /℃

Pd / W

Pd；Power Dissipation

5/11

REV. B

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 18

33 32 31 30 29 28 24 23 22 21 20 1936 35 34 27 26 25

16

Sled

Driver Loading

Driver

Spindle

Driver

-+ -+ -+

Actuator

Driver Actuator

Driver

-+

Det. Amp.

×2

PreVcc PVcc3 PVcc2 PGND

PVcc1PreGND PGND

PVcc1

PVcc2

PVcc3

Thermal

shut down

MUTE

10K 20K

10K 25K

10K 15K

10K

20K

7.5K

10K

20K

7.5K

Unit of resistance: 

Figure 3 BLOCK DIAGRAM

● Pin description

No Pin name Pin description No Pin name Pin descrition

1 LDBIA

S

Input for bias voltage (Loading driver) 1

9

VOLD (－) Inverted output of loading

2 BIA

S

Input for bias: voltag

e

2

0

VOLD (+) Non inverted output of loading

3

FCIN Input for focus driver 21 VOSL (－) Inverted output of sle

d

4

CFCerr1 Connection with capacitor for error amplifier 1 22 VOSL (+) Non inverted output of sle

d

5

CFCerr2 Connection with capacitor for error amplifier

2

3

VOSP (－) Inverted output of spindl

e

6

MUTE Input for mute control 2

4

VOSP (+) Non inverted output of spindl

e

7 TKIN Input for tacking driver 2

5

PGND2 GND for power block of loading, sled and

spindle driver

8 CTKerr1 Connection with capacitor for error amplifier 1 2

6

PVcc2 Vcc for power block of loading driver

9

CTKerr2 Connection with capacitor for error amplifier

2

27 PVcc

3

Vcc for power block of sled and spindle driver

1

0

PreGN

D

GND for pr

e

-

drive block 28 PreVcc Vcc for pr

e

-

drive block

11 PVcc1 Vcc for power block of actuator 2

9

SPIN Input for spindle driver

12 VNFFC Feedback for focus driver 3

0

OPOUTSL Sled Pre OP amplifier outpu

t

1

3

PGND1 GND for power block of actuator 31 OPINSL(－)Sled Pre OP amplifier invert inpu

t

1

4

VNFT

K

Feedback for tracking driver 32 OPINSL (+) Sled Pre OP amplifier non invert inpu

t

1

5

VOTK(－) Inverted output of tracking 3

3

LDIN Input for loading driver

1

6

VOTK (+) Non inverted output of tracking 3

4

OPOUT OP amplifier outpu

t

17 VOFC(－) Inverted output of focus 3

5

OPIN(－) OP amplifier invert inpu

t

18 VOFC (+) Non inverted output of focus 3

6

OPIN (+) OP amplifier non invert inpu

t

notes) Symbol of + and ‐ (output of drivers) means polarity to input pin.

(For example if voltage of pin3 is high , pin18 is high.)

6/11

REV. B

Figure 4 APPLICATION

1 2 3 4 5 6 7 8 9

Sled

Driver Loading

Driver

Spindle

Driver

-+ -+ -+

Actuator

Driver Actuator

Driver

-+

Det. Amp.

×2

PreVcc PVcc3 PVcc2 PGND

PVcc1

PreGND PGND

PVcc1

PVcc2

PVcc3

Thermal

shut down

MUTE

MMM

Loading

Motor

Sled

Motor

Spindle

Motor

Sled

Focus

Tracking

Spindle

Loading

MUTE

BIAS

10K

20K

10K

25K

15K

10K

20K 7.5K

7.5K

20K

10K

36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19

181716151413121110

SERVO

Rd

Tracking

Coil

Focus

Coil



-com

Power Supply for



-com

Loading BIAS

3 state type

10k

0.1m

7/11

REV. B

Figure5 TEST CIRCUIT

● Measurement circuit switch table

Actuator

Driver

Actuator

Driver

Det. Amp.

PreVcc PVcc3 PVcc2 PGND

PVcc1

PreGND PGND

PVcc1

PVcc2

PVcc3

Thermal

shut down

MUTE

10K 20K

10K 25K

10K 15K

10K

7.5K

36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19

Spindle

Driver

Sled

Driver

Loading

Driver

1 3 4567812

7.5K

20K 7.5K

10K

20K 7.5K

×2

2

OPAMP

INP

INM

OUT

OPAMP

INP

INM

OUT

IQ

MUTE

VIN1 VIN2

VIN3 VIN5

100H

5V

80.5

0.5

Io

8

5V

12V12V

10 11 13 14 15 16 17 18

9

1.65V 1.65V

100pF 100pF

8

Vo3

8

Vo4

8

Vo5

Vo2

Vo1

Io

1

2

1

2

INP INM OUT

2

3

1

BIAS

VINOP

VOOF VBOP

1M

4

1M

12

IOP

SW1

SW2

SW3

VBOP

10k 10k

OPAMP

VOOP

SW4

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REV. B

Symbol Switch Input Condition Measureme

nt point

SW1 SW2 SW3 SW4 VIN1 VIN2 VIN3 VIN5 VINOP MUTE

IQ 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V IQ

VMON 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V IQ

VMOFF 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 0.5V IQ

IOOF 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V IO

VOM 1 1 2 1

±1.65V ±1.65V 1.65V 1.65V － 2.0V VIN1,2=0, 3.3V VO1,2

Gvc 1 1 2 1

±0.2V ±0.2V 1.65V 1.65V － 2.0V VIN=1.45, 1.85V IO

IBOP 2 1 3 1 1.65V 1.65V 1.65V 1.65V － 2.0V VBOP

VIOFOP 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V VOOF

VOLOP 1 2 1 1 1.65V 1.65V 1.65V 1.65V 12V 2.0V

VOOP

ISO 1 1 2 2 1.65V 1.65V 1.65V 1.65V － 2.0V VOOP

ISI 1 1 2 2 1.65V 1.65V 1.65V 1.65V － 2.0V VOOP

VOOFSL 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V VO4

VOMSL 1 2 1 1 1.65V 1.65V 1.65V 1.65V

±1.65V 2.0V VINOP=0, 3.3V VO4

GVSL 1 2 1 1 1.65V 1.65V 1.65V 1.65V ±0.2V 2.0V VINOP=1.45, 1.85V VO4

VOOFLD 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V VO3

VOMLD 1 1 2 1 1.65V 1.65V

±1.65V 1.65V － 2.0V VIN3=0, 3.3V VO3

GVLD 1 1 2 1 1.65V 1.65V

±0.2V 1.65V － 2.0V VIN3=1.45, 1.85V VO3

VOOFSP 1 1 2 1 1.65V 1.65V 1.65V 1.65V － 2.0V VO5

VOMS 1 1 2 1 1.65V 1.65V 1.65V

±1.65V － 2.0V VIN5=0, 3.3V VO5

GVSP 1 1 2 1 1.65V 1.65V 1.65V

±0.2V － 2.0V VIN5=1.45, 1.85V VO5

● EQUIVALENT CIRCUIT OF TERMINALS

9/11

REV. B

OP amplifier input

35,36 PIN 2k

Pre OP amplifier input for sled

driver

31,32 PIN

2k

OP amplifier output

34 PIN

OP amplifier output for sled driver

（

& driver input

）

30 PIN

10k

Driver input

3,7,29,33 PIN 10k

inverted output for focus and tracking

driver

10k

15,17 PIN

VREF

10/11

REV. B

Output for driver

10k

16,18,20,22,24 PIN

(+)

19,21,23PIN

(-)

Bias input

1,2 PIN

75k

25k

Feedback for focus and tracking driver

12,14 PIN

10k

20k

Mute

50k

6 PIN

Connection with capacitor for error amplifier 1

4,8 PIN

7.5k

Connection with capacitor for error amplifier 2

5,9 PIN

15k

●Notes on use

11/11

REV. B

1. Thermal-shut- down circuit built-in. In case IC chip temperature rise to 175℃ (typ.) thermal-

shut-down circuit operates and output current is muted. Next time IC chip temperature falls below

150℃ (typ.)

2. In case mute-pin voltage under 0.5V or opened, quiescent current is muted. Mute-pin voltage should

be over 2.0V for normal application.

3. In case supply voltage falls below 3.5V (typ.), output current is muted. Next time supply voltage rises

to 3.7V(typ.), the driver blocks start.

4. Bias-pin (pin1 and pin2) should be pulled up more than 1.2V. In case bias-pin voltage is pulled down

under 1.0V (typ.), output current is muted.

5. In case a capacitance load is connected to the OP amplifier output, the amplifier phase margin

decreases, which causes the peak or oscillator.

When connecting such load, insert a resistance in series between the output and the capacitance load

and take a full consideration for frequency characteristics, to prevent problems during practical use.

6. Insert the by-pass capacitor between Vcc-pin and GND-pin of IC as possible as near (approximately

0.1F).

7. Heat dissipation fins are attached to the GND on the inside of the package. Make sure to connect

these to the external GND

8. Avoid the short-circuits between:

Output pin and Vcc

Output pin and GND

Output pins

If this caution is ignored, IC damage may cause smokes.

9. Examine in consideration of operating margin, when each driver output falls below sub-voltage of

IC (GND) due to counter-electromotive-force of load.

< Supplement >

Current feedback driver

Trans conductance (output current/input voltage) is shown as follws.

WIREd RR

gm 

1 ( A／V )

RWIRE: ≒0.075（±0.05）（Typ.）:Au wire

R1120

A

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