ROHM BD7755RFV Technical data

System Motor Driver ICs for CD / DVD / Blu-ray Drive and Recorder

System Motor Driver IC
for Half Height Drive (Sensor less)

BD7755RFV

●Description

BD7755RFV are ICs, developed for the spindle motor, actuator coil, tilt coil, stepping motor, SA stepping motor and the
loading motor drive of the desktop Blu-ray drive and Blu-ray recorder. Spindle driver adopted sensorless drive system, and
the hall sensor (3 pieces) of the motor position detection is not needed, it is suitable for making of flexible cable conserve
wiring and the reductions of external parts. The low rotation mode is built in, and stability and low-speed a rotation is
achieved. The spindle, stepping and SA stepping use power MOSFET to reduce power consumption and the actuator, tilt,
and loading driver use a linear BTL drive system to reduce noise.

●Features

1) The low-speed stability rotation is achieved with built-in the low rotation mode.

2) The hall sensor is unnecessary according to 3 aspect sensorless drive system.

3) The spindle motor driver achieves stability high speed start by ROHM's own energizing method.

4) Highly effective spindle, stepping and SA stepping is achieved by PWM control driver. And the output current detection
resistance of stepping and SA stepping is unnecessary by built-in internal detection circuit.

5) The actuator, tilt and loading driver achieve low noise by using linear BTL drive system.

6) ON/OFF of loading and other channels, brake mode of spindle driver and standby mode are selectable by the two
control terminals.

7) Built-in thermal-shut down circuit.

8) Improved heat radiation efficiency utilizing HTSSOP package.

●Applications

For desktop Blu-ray drive

●Absolute maximum ratings

No.10012EAT01

Parameter Symbol Ratings Unit

POWER MOS power supply voltage 1 SPVM, SLVM 15

POWER MOS power supply voltage 2 SAVM 7

Preblock/BTL power block power supply voltage Vcc, AVM, LDVM 15

PWM control block power supply voltage DVcc 7

Power dissipation Pd 1.5

Operating temperature range Topr -20 ~ 70

Storage temperature Tstg -55 ~ 150

Junction temperature Tjmax 150

#1 POWER MOS output terminals (40~43pin, 46～48pin) are contained.
#2 POWER MOS output terminals (35~38pin) are contained.
#3 PCB mounting (70mmX70mmX1.6mm, occupied copper foil is less than 3%, glass epoxy standard board).
Reduce by 12mW/℃ over 25℃

#1

#2

#3

V

V

V

V

W

℃

℃

℃

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© 2010 ROHM Co., Ltd. All rights reserved.

1/18

2010.06 - Rev.A

BD7755RFV

Technical Note

●Recommended operating conditions

(Set the power supply voltage with consideration to power dissipation)

Parameter Symbol

Spindle / Sled motor driver power block power
supply voltage

Min. Typ. Max.

SPVM,SLVM － Vcc

Ratings

#4

－ V

Pre block power supply voltage Vcc 10.8 12 13.2 V

Loading driver power block supply voltage LDVM 4.3 5.0 Vcc V

Unit

SA, Actuator driver power block
power supply voltage

SAVM,AVM 4.3 5.0 5.5 V

PWM control block power supply voltage DVcc 4.3 5.0 5.5 V

Spindle driver output current Iosp － 1.0 2.5 #5A

Actuator, SA, sled, loading motor driver
output current

#4 Set the same supply voltage to SPVM, SLVM and Vcc.
#5 The current is guaranteed 3.5A in case of the Short-circuit braking mode and the current which is turned on/off in
a duty-ratio of less than 1/10 with a maximum on-time of 5msec

Ioo － 0.5 0.8 A

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© 2010 ROHM Co., Ltd. All rights reserved.

2/18

2010.06 - Rev.A

BD7755RFV

●Electrical characteristics
(Unless otherwise noted, Ta=25℃, Vcc=SPVM=SLVM=12V, DVcc=AVM=SAVM= LDVM=5V, Vc=1.65V,RL=8Ω,RLSP=2Ω)

Parameter Symbol

Circuit current

Quiescent current 1 IQ1 － 14 30 mA Vcc(Loading OFF)
Quiescent current 2 IQ2 － 7.5 16 mA Vcc(Loading ON)
Quiescent current 3 IQ3 － 7 14 mA DVcc
Standby-on current 1 IST1 － 1.1 2.4 mA Vcc
Standby-on current 2 IST2 － 0.16 0.4 mA DVcc

Sled driver block

Input dead zone (one side) VDZSL 0 30 80 mV

Input output gain gmSL 0.75 1.0 1.25 A/V
Output On resistor

(top and bottom)
Output limit current ILIMSL 0.8 1.1 1.4 A

PWM frequency fosc － 100 － kHz

Spindle driver block<Torque instruction input / output>

Input dead zone (one side)1 VDZSP1 20 55 90 mV VLRPM=L

Input dead zone (one side)2 VDZSP2 20 240 450 mV VLRPM=H

Input output gain 'H' gmSPH 2.68 3.5 4.32 A/V VLRPM=L

Input output gain 'L' gmSPL 0.53 0.7 0.87 A/V VLRPM=H
Output On resistor (top and bottom) RONSP － 1.0 1.7 Ω IL=500mA
Output limit current ILIMSP 1.35 1.6 1.85 A RSPLIM=1.5kΩ
PWM frequency fosc － 167 － kHz

FG output, PRTFLG output

High voltage VOH － 4.9 － V 100kΩ pull up to DVcc
Low voltage VOL － 0.1 － V

Focus / Tracking / Tilt driver block

Output offset voltage VOFA -50 0 50 mV
Output saturation voltage (top and bottom) VOHA － 0.9 1.8 V IL=500mA

Voltage gain H GVAH 19.6 21.6 23.6 dB VLRPM=L

Voltage gain L GVAL 13.6 15.6 17.6 dB VLRPM=H

SA stepping driver block

Input dead zone (one side) VDZSA 40 80 160 mV

Input output gain gmSA 0.15 0.2 0.25 A/V
Output On resistor (top and bottom) RONSA － 1.3 2.5 Ω IL=200mA

Output limit current ILIMSA 0.28 0.4 0.52 A
PWM frequency fosc － 100 － kHz

Loading driver block

Output offset voltage VOFLD -50 0 50 mV
Output saturation voltage (top and bottom) 1 VOLD1 － 0.7 1.6 V IL=500mA LDVM=5V
Output saturation voltage (top and bottom) 2 VOLD2 － 2.1 3.6 V IL=500mA LDVM=12V

Voltage gain GVLD 15.5 17.5 19.5 dB

CTL1,CTL2, LRPM

Input high voltage VIH 2.5 － 3.7 V
Input low voltage VIL GND － 0.5 V

Others

VC drop-muting VMVC 0.4 0.7 1.0 V

Vcc drop-muting VMVcc 3.45 3.85 4.25 V

*This product is not designed to be radiation-resistant.

RONSL － 2.2 3.8 Ω IL=500mA

MIN. TYP. MAX.

Limits

Unit Conditions

Technical Note

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© 2010 ROHM Co., Ltd. All rights reserved.

3/18

2010.06 - Rev.A

BD7755RFV

●Block diagram

Technical Note

C_OUT

C_COM

FG

CTL1

CTL2

LRPM

PRTLIM

SPIN

LDIN

LDVM

LDO+

LDO-

AGND

FCO+

FCO-

TLO+

TLO-

TKO+

TKO-

TKIN

TLIN

1

2

3

4

STBY

BRAKE

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

LRPM

PRTLIM

80kΩ

40kΩ

40kΩ

LDVM/2

80kΩ

160kΩ

160kΩ

AVM/2

160kΩ

160kΩ
160kΩ

160kΩ

160kΩ

AVM/2

160kΩ
160kΩ

160kΩ

160kΩ

AVM/2

160kΩ

CONTROL

SHIFT

40kΩ

80kΩ

80kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

LEVEL

×2

T.S.D

CURR.

LIMIT

CURR.

LIMIT

CURR.

FEED

CURR.FEED

OSC

OSC

CURR.FEED

CURR.FEED

OSC

OSC

CURR.FEED

BEMF

DETECTER

FFFF

FFFF

CURR.

Logic

OSC

PRE

Logic

PRE

Logic

PRE

Logic

PRE

Logic

54

LIMIT

SPLIM

53

GND

52

SPVM

51

COM

50

W

49

N.C.

48

V

47

U

46

N.C.

45

SPGND

44

SLVM

43

SLO2-

42

SLO2+

41

SLO1-

40

SLO1+

39

SL/SAGND

38

SAO2-

37

SAO2+

36

SAO1-

35

SAO1+

34

SLDETOUT

FCIN

AVM

VC

VCC

PRTFLG

DVCC

22

23

24

25

26

27

PROTECT

LEVEL
SHIFT

LEVEL
SHIFT

LEVEL
SHIFT

LEVEL
SHIFT

62.6kΩ

62.6kΩ

DETECTER

33

SLDET

32

SAVM

31

SLIN1

30

SLIN2

29

SAIN1

28

SAIN2

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© 2010 ROHM Co., Ltd. All rights reserved.

4/18

2010.06 - Rev.A

BD7755RFV

●Pin description

No. Symbol Description No. Symbol Description

Technical Note

1 C_OUT

2 C_COM

3 FG Frequency generator output 30 SLIN2 Sled driver 2 input

4 CTL1 Driver logic control 1 input 31 SLIN1 Sled driver 1 input

5 CTL2 Driver logic control 2 input 32 SAVM SA driver power block power supply

6 LRPM Low rotation mode change terminal 33 SLDET Sled motor detection signal control input

7 PRTLIM

8 SPIN Spindle driver input 35 SAO1+ SA driver 1 positive output

9 LDIN Loading driver input 36 SAO1- SA driver 1 negative output

10 LDVM Loading driver block power supply 37 SAO2+ SA driver 2 positive output

11 LDO+ Loading driver positive output 38 SAO2- SA driver 2 negative output

12 LDO- Loading driver negative output 39 SL/SAGND

13 AGND BTL driver block GND 40 SLO1+ Sled driver 1 positive output

Smooth capacitor connection terminal
(output side)

Smooth capacitor connection terminal
(com side)

Adjustable resistor connection for
actuator protection

28 SAIN2 SA driver 2 input

29 SAIN1 SA driver 1 input

34 SLDETOUT Sled motor detection signal output

Sled/SA driver block pre and power
ground

14 FCO+ Focus driver positive output 41 SLO1- Sled driver 1 negative output

15 FCO- Focus driver negative output 42 SLO2+ Sled driver 2 positive output

16 TLO+ Tilt driver positive output 43 SLO2- Sled driver 2 negative output

17 TLO- Tilt driver negative output 44 SLVM Sled motor driver power supply

18 TKO+ Tracking driver positive output 45 SPGND Spindle driver power ground

19 TKO- Tracking driver negative output 46 N.C. N.C.

20 TKIN Tracking driver input 47 U Spindle driver output U

21 TLIN Tilt driver input 48 V Spindle driver output V

22 FCIN Focus driver input 49 N.C. N.C.

23 AVM Actuator driver block power supply 50 W Spindle driver output W

24 VC Reference voltage input 51 COM Motor coil center point input

25 Vcc Pre block power supply 52 SPVM Spindle driver power supply

26 PRTFLG Protection flag output 53 GND Pre block GND

27 DVcc PWM block control power supply 54 SPLIM

*Positive/negative of the output terminals is determined in reference to those of the input terminals.

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5/18

Adjustable resistor connection for
spindle driver current limit

2010.06 - Rev.A

BD7755RFV

●Equivalent-circuit diagram of the terminals

Three-phase motor driver output BEMF voltage detection input

Technical Note

51

52pin

10k

5k

1

2

5k 5k 10k

53pin

47

52

48 50

45

PWM driver output SLED1,2 PWM driver output SA1,2 BTL driver output FC,TK,TL

40

42

44

39

41

43

35

37

32

39

36

38

14

16

18

13

23

15

17

19

BTL driver output LD BTL driver input FC,TK,TL,LD PWM driver input SLED1,2

11

13

10

12

20

22

21

25pin

9

200Ω

53pin

30

31

27pin

200Ω

53pin

PWM driver input SA1,2 PWM driver input Spindle Spindle current limit input

52pin

54

53pin

28

29

27pin

53pin

62.6kΩ

27pin

8

200Ω

53pin

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6/18

2010.06 - Rev.A

BD7755RFV

●Equivalent-circuit diagram of the terminals

PRTFLG, FG signal output SLDETOUT signal output SLED inner detection input

Technical Note

25pin

10kΩ

33

53pin

26

25pin

3

30Ω

27pin

30Ω

34

53pin

53pin

Actuator current limit input Control signal reference voltage input

25pin

25pin

7

53pin

10kΩ

5kΩ

24

53pin

62.6kΩ

200Ω

×2ch

10kΩ

×6ch

×2ch

10kΩ

50kΩ

50kΩ

Control signal input (CTL1) Control signal input (CTL2, LRPM)

25pin

25pin

50kΩ

4

50kΩ

53pin

180kΩ

20kΩ

53pin

270kΩ

5

20kΩ

53pin

150kΩ

50kΩ

50kΩ

150kΩ

150kΩ

50kΩ

50kΩ

150kΩ

25pin

6

53pin

53pin

120kΩ

100kΩ

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© 2010 ROHM Co., Ltd. All rights reserved.

7/18

2010.06 - Rev.A

BD7755RFV

●Test circuit

Technical Note

ISPLIM

CTL2

CTL1

LRPM

VSPIN

LDIN

LDVM

TKIN

TLIN

FCIN

AVM

VCC

COUT

100k

+ -

OUT

LD

+ -

OUT

FC

+ -

OUT

TL

+ -

OUT

TK

VC

100k

IQDVDVCC

IQVC

C_OUT

C_COM

CTL1

CTL2

LRPM

PRTLIM

SPIN

LDIN

LDVM

LDO+

LDO-

AGND

FCO+

FCO-

TLO+

TLO-

TKO+

TKO-

TKIN

TLIN

FCIN

AVM

VCC

PRTFLG

DVCC

1

2

3

FG

4

STBY

BRAKE

5

CONTROL

6

LRPM

PRTLIM

7

8

40kΩ

9

10

80kΩ

11

40kΩ

40kΩ

LDVM/2

12

80kΩ

13

160kΩ

14

160kΩ

AVM/2

160kΩ

15

160kΩ
160kΩ

16

160kΩ

160kΩ

AVM/2

17

160kΩ
160kΩ

18

160kΩ

160kΩ

AVM/2

19

160kΩ

×2

80kΩ

80kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

20

21

T.S.D

SHIFT

LEVEL

CURR.

FEED

CURR.FEED

OSC

CURR.

LIMIT

OSC

CURR.FEED

CURR.FEED

OSC

CURR.

LIMIT

OSC

CURR.FEED

Logic

BEMF

DETECTER

OSC

FFFF

PRE

Logic

PRE

Logic

FFFF

PRE

Logic

PRE

Logic

22

23

24

VC

25

26

PROTECT

27

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

62.6kΩ

62.6kΩ

54

LIMIT

CURR.

SPLIM

53

GND

52

SPVM

51

COM

50

W

49

N.C.

48

V

47

U

46

N.C.

45

SPGND

44

SLVM

43

SLO2-

42

SLO2+

41

SLO1-

40

SLO1+

39

SL/SAGND

38

SAO2-

37

SAO2+

36

SAO1-

35

SAO1+

34

SLDETOUT

33

DETECTER

SLDET

32

SAVM

31

SLIN1

30

SLIN2

29

SAIN1

28

SAIN2

100k

VSLDET

12

SPVM

COM

SP

OUT

U V W

SLVM

OUT

SLO2

+ -

OUT

SLO1

+ -

OUT

SAO2

+ -

OUT

SAO1

+ -

DVCC

SAVM

VSLIN1

VSLIN2

VSAIN1

VSAIN2

4.7kΩ

12

2kΩ

CCOM

CCOM

12

DVCC

DVCC

OUT+

OUT-A

V

Vo

RL

47µH

2

1

IL

SW-RL

2

2

IL

OUT-

1

1

SW-ILSW-IL

OUTSP

UWV

2-W

2-V

2-U

1

IL

SW-IL

RLSP

2

SW-RL

47µH

RLSP

RLSP

47µH

47µH

2

SW-RL

1

1

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8/18

2010.06 - Rev.A

BD7755RFV

●Functional description

1-1. Driver logic control terminal 1and 2 (CTL1,2)

All drivers and spindle-drive braking modes can be switched on/off by inputting combinations of H-level signal (higher
than 2.5V and lower than 3.7V), L-level signal (lower than 0.5V) and HiZ signal (open) to these terminals.

・Driver ON/OFF logic table

mode

①
②
③
④
⑤

・Spindle braking mode table

mode

③
④
⑤

1-2.Spindle output mode

The spindle output changes as follows by the setting of LRPM and SPIN. (CTL1=H,CTL2=H or HiZ)

Rotation speed 0rpm 400rpm 4500rpm

1-3.Gain switching mode

CTL1 CTL2 SP SL(2ch) ACT(3ch) SA(2ch) LOADING

L, HiZ L, HiZ × × × × ×

H L × ○ × × ○
H HiZ ○ ○ ○ × ×

L, HiZ H ○ ○ ○ ○ × ○:ON

H H ○ ○ ○ ○ × ×:OFF

① Stand-by mode
The IC is brought into stand-by mode, and its power dissipation can be limited.
② Drivers muting
All output channels, except the loading and sled motor are muted and their outputs are turned off.
③ SA mute mode
The loading and SA driver are muted.
④⑤ Loading OFF mode
Only the loading driver is muted.

CTL1 CTL2 SPIN > VC SPIN < VC

H HiZ

L, HiZ H

H H

③⑤Reverse-rotation braking mode (spindle)
When SPIN < VC, all output are shorted to SPVM in 4500rpm (Typ.) or more, in less than
4500rpm (Typ.) the output become reverse-rotation braking mode.
Rotation speed is less than 140rpm when SPIN < VC, all the output are shorted to SPVM.
(However, the above-mentioned rotational speed is expressed in the case of 12pole motor.)
④ Short-circuit braking mode (spindle)
All the spindle driver outputs are shorted to SPVM when SPIN < VC.

Normal mode

LRPM=Low

⑥

LRPM mode
LRPM=High

* PWM frequency becomes 30kHz (Typ.) in LRPM mode.
The torque at SPIN<VC becomes a counter torque

⑥ Low rotation mode
Please make to low rotation mode (LRPM=HI) after it starts in normal mode (LRPM=L).

Spindle driver and actuator driver can be switched on/off by inputting combinations of H-level signal (higher than

2.5V and lower than 3.7V), L-level signal (lower than 0.5V) and HiZ signal (open) to LRPM terminal.

LRPM SP Gain ACT Gain (3ch)

L H gain (3.5A/V±0.82A/V) H gain (21.6dB±2dB)

HiZ L gain (0.7A/V±0.17A/V) H gain (21.6dB±2dB)

H L gain (0.7A/V±0.17A/V) L gain (15.6dB±2dB)

Forward-rotation mode

SPIN>VC 120°energizing 150°energizing
SPIN<VC 120°energizing 150°energizing Short brake
SPIN>VC 120°energizing

SPIN<VC (H,Hi-Z,Hi-Z)

Reverse-rotation braking mode (LRPM=L)

Short-circuit braking mode

Reverse-rotation braking mode (LRPM=L)

Technical Note

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9/18

2010.06 - Rev.A

BD7755RFV

Technical Note

2. Output limit for spindle (SPLIM)

3. Torque command (SPIN) (SLIN1,2) (SAIN1,2)

The relation between (the torque command inputs) and (Iosp or Ioo) is expressed in the figure below: The gain is defined
by the inclination between two points. (Please exclude the dead zone from the input voltage when calculating Iop. )

Iop

Forward rotation

Input dead zone +
Input dead zone -

Gain

SPIN

SLIN1,2

VC

SAIN1,2

4. FG output (FG)

3FG output begins after 900°degrees in electric angle, after the start mode ends and the BEMF detection starts. When
the rotational speed becomes 24rpm (Max.) or less in case of brake, the FG output is fixed to high.
The above-mentioned rotation speed applies to the 12 pole motor.

5. Input/Output timing chart

BEMFU

BEMFV

BEMFW

SPIN

U

V

W

VC

SOURCE

MID

SINK

SOURCE

MID

SINK

SOURCE

MID

SINK

》

》

》

》

》

》

》

》》

》

》

》

》

》

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© 2010 ROHM Co., Ltd. All rights reserved.

Ⅰ) Forward

-rotation mode

Ⅱ) Reverse-rotation

braking mode

10/18

Ⅲ) Short-circuit

braking mode

2010.06 - Rev.A

BD7755RFV

Technical Note

6. Protect system 1

It is a function to mute the actuator outputs when the IC outputs the current more than the setting threshold value IPRTLIM
for 1.2sec because of the protection for the focus, the tracking, and the tilt coil. Outputs are muted similarly when the
output current of two or three CHs continuously exceed the threshold for 1.2sec.
It returns to normal operation by setting CTL2=L.

IPRTLIM =

A

RPRTLIM(Ω)

(A)

A = 8750

PRTFLG(OUTPUT) Actuator output (FCO/TKO/TLO)

H OFF

L active

MIN. TYP. MAX. Unit

Time until protection function operates 1.0 1.2 1.4 s

FCIN1 0

Current between

FCO outputs

Current between

TLO outputs

Current between

TKO outputs

CTL2

High

Low

FCIN1

0

0

0

reset

1.2sec mute 1.2sec mute

threshold current

threshold current

threshold current

Current between

FCO outputs

Current between

TLO outputs

Current between

TKO outputs

CTL2

High

Low

0

0

0

0

threshold current

threshold current

threshold current

7. Protect system 2

Function to protect against destruction of output terminal when output pin connects to GND or Vcc.

PRTFLG(OUTPUT) Spindle, Sled motor driver output

H OFF

L active

・Spindle, Sled motor
・When SINK side POWER transistor has been turned on, if the output voltage (SPVM/2&SLVM/2<TYP> or more) are

detected, the channel concerned will be turned off.

・When SOURCE side POWER transistor has been turned on, if the output voltage (SPVM/2&SLVM/2<TYP> or less ) are

detected, the channel concerned will be turned off.

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11/18

2010.06 - Rev.A

BD7755RFV

8. Inner detection function

BEMF of the motor is monitored according to timing for the sled input signal to pass VC, and Sled is detected reaching the
inner. The judgment voltage of BEMF can be set according to the voltage input to the terminal SLDET. If BEMF below the
judgment voltage is detected twice continuously, it becomes SLDETOUT=L. The inner detection function can be turned off
with SLDET<0.5V. When the motor starts, the terminal SLDETOUT might become L because BEMF is unstable. Please
take measures such as installing the time of the mask when it starts for the detection prevention.

Judgment voltage Vbemf =2.1 × (SLDET - VC) + 0.49

SLIN1 SLIN2

VC

Motor

SLDETOUT

X

Instability

Stop

:Detection point
BEMF < Vbemt

:Detection point
BEMF > Vbemt

Technical Note

SLDET

9. PWM oscillation frequency

The PWM oscillation for driving the spindle and sled is free running.
The sled and SA oscillating frequency is 100kHz (Typ.)
The spindle oscillating frequency is 167kHz (Typ.)

10. Muting functions
a) VC-drop muting

When the voltage at VC terminal drops to a value lower than 0.7V (Typ.), the outputs of all the channels are turned off.
Set the VC terminal voltage higher than 1.0V.

b) Vcc-drop muting

When the voltage at DVcc terminal and Vcc terminal drop to lower than 3.85V (Typ.), the outputs of all the channels
are turned off.

c) Over voltage protection circuit

When the voltage at SPVM terminal exceed 14.1V (Typ.), only the spindle block output is turned off.

11. Thermal-shut down
Thermal-shutdown circuit (over-temperature protection circuit) is built in to prevent the IC from thermal breakdown. Use
the IC according to the thermal loss allowed in the package. In case the IC is left running over the allowed loss, the
junction temperature rises, and the thermal-shutdown circuit works at a junction temperature of 175℃(Typ.) (All other
channel outputs are turned off)
When the junction temperature drops to 150℃ (Typ.) the IC resumes operation.

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12/18

2010.06 - Rev.A

BD7755RFV

●Notes for use

1. Absolute maximum ratings
We are careful enough for quality control about this IC. So, there is no problem under normal operation, excluding that it
exceeds the absolute maximum ratings. However, this IC might be destroyed when the absolute maximum ratings, such
as impressed voltages (Vcc, PVcc) or the operating temperature range(Topr), is exceeded, and whether the destruction is
short circuit mode or open circuit mode cannot be specified. Please take into consideration the physical countermeasures
for safety, such as fusing, if a particular mode that exceeds the absolute maximum rating is assumed.

2. Power supply line
Due to switching and EMI noise generated by magnetic components (inductors and motors), using electrolytic and ceramic
suppress filter capacitors(0.1μF) close to the IC power input terminals (Vcc and GND) is recommended. Please note: the
electrolytic capacitor value decreases at lower temperatures. Current rush might flow momentarily by the order of turning
on the power supply and the delay in IC with two or more power supplies. Note the capacity of the power supply coupling,
width and drawing the power supply and the GND pattern wiring.Please make the power supply lines (where large current
flow) wide enough to reduce the resistance of the power supply patterns, because the resistance of power supply pattern
might influence the usual operation (output dynamic range etc…).

3. GND line
The ground line is where the lowest potential and transient voltages are connected to the IC.

4. Thermal design
Do not exceed the power dissipation (Pd) of the package specification rating under actual operation, and please design
enough temperature margins.

5. Short circuit mode between terminals and wrong mounting
Do not mount the IC in the wrong direction and be careful about the reverse-connection of the power connector. Moreover,
this IC might be destroyed when the dust short the terminals between them or GND

6. Radiation
Strong electromagnetic radiation can cause operation failures.

7. ASO(Area of Safety Operation.)
Do not exceed the maximum ASO and the absolute maximum ratings of the output driver.

8. TSD(Thermal shut-down)
The TSD is activated when the junction temperature (Tj) reaches 175℃(with 25℃ hysteresis), and the output terminal is
switched to Hi-z. The TSD circuit aims to intercept IC from high temperature. The guarantee and protection of IC are not
purpose. Therefore, please do not use this IC after TSD circuit operates, nor use it for assumption that operates the TSD
circuit.

9. Inspection by the set circuit board
The stress might hang to IC by connecting the capacitor to the terminal with low impedance. Then, please discharge
electricity in each and all process. Moreover, in the inspection process, please turn off the power before mounting the IC,
and turn on after mounting the IC. In addition, please take into consideration the countermeasures for electrostatic
damage, such as giving the earth in assembly process, transportation or preservation.

Technical Note

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13/18

2010.06 - Rev.A

BD7755RFV

Technical Note

10. Earth wiring pattern
This IC is a monolithic IC, and has P+ isolation and P substrate for the element separation. Therefore, a parasitic PN
junction is firmed in this P-layer and N-layer of each element. For instance, the resistor or the transistor is connected to the
terminal as shown in the figure below. When the GND voltage potential is greater than the voltage potential at Terminals A
or B, the PN junction operates as a parasitic diode. In addition, the parasitic NPN transistor is formed in said parasitic diode
and the N layer of surrounding elements close to said parasitic diode. These parasitic elements are formed in the IC
because of the voltage relation. The parasitic element operating causes the wrong operation and destruction. Therefore,
please be careful so as not to operate the parasitic elements by impressing to input terminals lower voltage than GND(P
substrate). Please do not apply the voltage to the input terminal when the power-supply voltage is not impressed. Moreover,
please impress each input terminal lower than the power-supply voltage or equal to the specified range in the guaranteed
voltage when the power-supply voltage is impressing.

Terminal-A

+

P

Parasitic

element

Resistor

P

P-Substrate

GND

Transistor(NPN)

GND

Terminal-B

Surrounding

elements

C

B

E

Parasitic

element

GND

Terminal-B

Terminal-A

+

P

Parasitic

element

CB

+

P

Parasitic

element

E

P

P-Substrate

GND

+

P

Simplified structure of IC

11. Earth wiring pattern

Use separate ground lines for control signals and high current power driver outputs. Because these high current outputs
that flows to the wire impedance changes the GND voltage for control signal. Therefore, each ground terminal of IC must
be connected at the one point on the set circuit board. As for GND of external parts, it is similar to the above-mentioned.

12. Reverse-rotation braking

In the case of reverse-rotation braking from high speed rotation, pay good attention to reverse electromotive force.
Furthermore, fully check the voltage to be applied to the output terminal and consider the revolutions applied to the
reverse-rotation brake.

13. About the capacitor between SPVM and SPGND

The capacitor between SPVM and SPGND absorbs the change in a steep voltage and the current because of the PWM
drive, as a result, there is a role to suppress the disorder of the SPVM voltage. However, the effect falls by the influence of
the wiring impedance etc, if the capacitor becomes far from IC. Please examine the capacitor between SPVM and SPGND
to arrange it near IC.

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© 2010 ROHM Co., Ltd. All rights reserved.

14/18

2010.06 - Rev.A

BD7755RFV

●Application circuit

,

1000pF

M

PRTFLG

C_OUT

C_COM

FG

CTL1

CTL2

LRPM

PRTLIM

SPIN

LDIN

LDVM

LDO+

LDO-

AGND

FCO+

FCO-

TLO+

TLO-

TKO+

TKO-

TKIN

TLIN

FCIN

AVM

VC

VCC

DVCC

Technical Note

1

2

3

4

STBY

5

BRAKE

CONTROL

6

LRPM

7

PRTLIM

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

80kΩ

40kΩ

40kΩ

LDVM/2

80kΩ

160kΩ

160kΩ

AVM/2

160kΩ

160kΩ
160kΩ

160kΩ

160kΩ

AVM/2

160kΩ
160kΩ

160kΩ

160kΩ

AVM/2

160kΩ

PROTECT

40kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

26.5kΩ

×2

80kΩ

80kΩ

T.S.D

SHIFT

LEVEL

CURR.

FEED

CURR.FEED

OSC

CURR.

LIMIT

OSC

CURR.FEED

CURR.FEED

OSC

CURR.

LIMIT

OSC

CURR.FEED

LEVEL
SHIFT

LEVEL
SHIFT

LEVEL

SHIFT

LEVEL

SHIFT

Logic

BEMF

DETECTER

OSC

FFFF

PRE

Logic

PRE

Logic

FFFF

PRE

Logic

PRE

Logic

62.6kΩ

62.6kΩ

LIMIT

CURR.

DETECTER

54

SPLIM

53

GND

52

SPVM

51

COM

50

W

49

N.C.

48

V

47

U

46

N.C.

45

SPGND

44

SLVM

43

SLO2-

42

SLO2+

41

SLO1-

SLO1+

40

39

SL/SAGND

38

SAO2-

37

SAO2+

36

SAO1-

35

SAO1+

34

SLDETOUT

33

SLDET

32

SAVM

31

SLIN1

30

SLIN2

29

SAIN1

28

SAIN2

1.5kΩ

STM

STM

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© 2010 ROHM Co., Ltd. All rights reserved.

15/18

2010.06 - Rev.A

BD7755RFV

●Connecting wires of application board

Technical Note

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© 2010 ROHM Co., Ltd. All rights reserved.

16/18

2010.06 - Rev.A

BD7755RFV

●Pattern drawing of application board

Technical Note

●Power dissipation reduction

2.0

1.5W

1.0

Power dissipation : Pd (W)

*70mm×70mm, t=1.6mm, occupied copper foil is less than 3%, glass epoxy mounting.

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© 2010 ROHM Co., Ltd. All rights reserved.

25 50 75 100 125 1500

AMBIENT TEMPERATURE : Ta (℃)

17/18

2010.06 - Rev.A

BD7755RFV

●Ordering part number

B D 7 7 5 5 R F V - E 2

Part No. Part No.

7755

HTSSOP-B54R

9.5±0.2

7.5±0.1

0.8

18.5±0.1

(MAX 18.85 include BURR)

(6.0)

54 28

1PIN MARK

+

6°

4°

−

4°

(5.0)

0.5±0.15

1.0±0.2

271

+0.05

0.17

-

0.03

S

Package

RFV: HTSSOP-B54R

<Tape and Reel information>

Embossed carrier tape (with dry pack)Tape

Quantity

Direction
of feed

1500pcs
E2

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

Packaging and forming specification
E2: Embossed tape and reel
(HTSSOP-B54R)

Technical Note

1.0MAX

0.85±0.05

0.08±0.05

0.65

0.22

+0.05

-

0.04

0.08

0.08

S

M

(Unit : mm)

Reel

1pin

Order quantity needs to be multiple of the minimum quantity.

∗

Direction of feed

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© 2010 ROHM Co., Ltd. All rights reserved.

18/18

2010.06 - Rev.A

Notes

No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.

The content specied herein is subject to change for improvement without notice.

The content specied 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 specications,
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 specied 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 specied 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.

Notice

The Products specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, commu­nication devices, electronic appliances and amusement devices).

The Products specied 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
against the possibility of physical injury, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel­controller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology specied herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.

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R1010

A