1/3
REV. A
Structure Silicon Monolit hic Integrated Circuit
Product series 6ch Power Driver for CD,DVD±RW,DVD-RAM
Type BD7781AEFS
Characteristic ・3-phase-s ensor-less system, therefore d on’t need three hall sens ors.
特 長 ・Output current detection resister is not necessar y with internally
equipped detection circ uit.
○Absolute maximum ratings
Parameter Symbol Limits Unit
POWER MOS Power supply voltage SPVM,SLVM 15 #1 V
Preblock/BTL powerblock Power supply voltage Vcc, AVM,LDVM 15 V
PWM control block Power supply voltage DVcc 7 V
Power dissipation Pd 2.0 ＃2 W
Operating temperature ra nge Topr -20～70 ℃
Storage temperature Tstg -55～150 ℃
Junction temperature Tjmax 150 ℃
#1 POWER MOS output terminals (8～10, 13～16pin) is contained.
#2 PCB (70mm×70mm×1.6mm,occupied copper foil is less than 3%,g lass epoxy standard board) mounting.
Reduce power by 16mW for each degree above 25℃.
○Recommended operatin g conditions (Ta=-20～+70℃)
(Set the power supply voltage taking allowable dissipation into considering)
Parameter S ymbol MIN TYP MAX Unit
Spindle driver powerblock power supply voltage SPVM － Vcc#3 － V
Sled motor driver powerblock power supply voltage SLVM － Vcc#3 － V
Preblock power supply voltage Vcc 10.8 12 13.2 V
Loading driver power block power supply voltage LDVM 4.3 5.0 Vcc#3 V
Actuator driver powerblock power supply voltage AVM 4.3 5.0 5.5 V
PWM control block power supply voltage DVcc 4.3 5.0 5.5 V
Spindle driver o utput current Iosp － 1.0 2.5#4 A
Actuator/sled motor/loading motor driver output current Ioo － 0.5 0.8 A
#3 Set the same supp ly voltag e to SPVM,SLVM and Vcc．
#4 The current is guaranteed 3.5A in case of the Short-circuit brak ing mode and the current w hich is turned on/of f
in a duty-ratio of le ss than 1/10 with a maximu m on-time of 5msec.
This product isn’t designed for protection against rad ioactive rays.
St atus of th is document
The Jap anese ve rsion of th is document is the fo rmal spec ification.
A customer may use this translation version only for a reference to help reading the formal version.
If there are any differences in translation version of this document , formal version takes priority.
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REV. A
○Electrical characteristics
(Unless otherwise noted, Ta=25℃, Vcc=SPVM=SLVM=12V, DVcc=AVM=LDVM=5V, VC=1.65V, RL=8Ω, RLSP=2Ω)
Parameter Symbol MIN. TYP. MAX. Unit Condition
Circuit
current
Quiescent current 1 IQ1 － 14 25 mA
Vcc（When Loading OFF）
Quiescent current 2 IQ2 － 7 12 mA
Vcc（When Loading ON）
Quiescent current 3 IQ3 － 6.5 11 mA DVcc
S tandby-on curren t1 IST1 － 0 100
μA Vcc
S tandby -on current 2 IST2 － 0 100
μA DVcc
Sled motor
driver bloc k
Input dead zone (one side) VDZSL 0 20 80 mV
Input output gain gmSL 0.75 1.0 1.25 A/V RSLLIM=3kΩ
Output ON resistor RONSL － 2.2 3.0 Ω IL=500mA
Output limit current ILIMSL 0.85 1.0 1.15 A RSLLIM=3kΩ
PWM frequency fsl － 100 － kHz
Spindle
driver bloc k
Input dead zone (one side)1 VDZSP1 20 55 90 mV VLRPM=L
Input dead zone (one side)2 VDZSP2 20 220 450 mV VLRPM=H
Input output gain H gmSPH 2.3 3.0 3.7 A/V RSPLIM=1.3kΩ, VLRPM=L
Input output gain L gmSPL 0.46 0.6 0.74 A/V RSPLIM=1.3kΩ, VLRPM=H
Output ON resistor RONSP － 1.1 1.7 Ω IL=500mA
Output limit current ILIMSP 1.3 1.55 1.8 A RSPLIM=1.3kΩ
PWM frequency fsp － 167 － kHz
Focus
driver bloc k
Output offset vo ltage VOFF -20 0 20 mV
Output saturation V olt age VOHF － 0.7 1.6 V IL=500mA
V olt age gain H GVFH 19.6 21.6 23.6 dB VLRPM=L
V olt age gain L GVFL 13.6 15.6 17.6 dB VLRPM=H
T racking
driver bloc k
Output offset vo ltage VOFT -30 0 30 mV
Output saturation V olt age VOHT － 0.7 1.6 V IL=500mA
Voltage gain GVT 19.6 21.6 23.6 dB
Loading
driver bloc k
Output offset vo ltage VOFLD -50 0 50 mV
Output saturation V o ltage 1 VOLD1 － 0.6 1.6 V
IL=500mA、LDVM=5V
Output saturation V o ltage 2 VOLD2 － 1.9 3.5 V
IL=500mA、LDVM=12V
Voltage gain GVLD 15.5 17.5 19.5 dB
Others VC drop-muting VMVC 0.4 0.7 1.0 V
Vcc drop-muting VMVcc 3.45 3.85 4.25 V
○Package outlines
(UNIT : mm)
HTSSOP-A44
BD7781EFS
Lot No.
PRODUCT NUMBER
1PIN MARK
( MAX 18.85 ( include BURR ) )
A
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REV. A
○Block diagram / Application circuit
FCO+
FCO-
FCIN
AVM
5V
TKIN
PRTFLG
PRTRST
LDO+
LDO-
LDIN
AGND
LRPM
VC
CTL1
CTL2
U
W
V
SPLIM
SPVM SPIN
COM
C_COM
C_OUT
SLO1+
SLLIM
SLVM
SLIN1
SLO1-
SLO2+
SLO2-
SLIN2
LDVM
M
SLGND
100k
5V
RSLLIM
3kΩ
SPGND
FG
PRE
Logic
PRE
Logic
FF
FF
BEMF
DETECTER
Logic
T.S.D.
STBY
BRAKE
CONTROL
LRPM
RSPLIM
1.3kΩ
12V
12V
12V
CTL2
CTL1
VC
FG
SPIN
SLIN2
SLIN1
LDIN
PRT
RST
PRT
FLG
TKIN
FCIN
160kΩ
160kΩ26.5kΩ
26.5kΩ
160kΩ
160kΩ26.5kΩ
26.5kΩ
80kΩ
74kΩ
80kΩ
80kΩ
74kΩ40kΩ
80kΩ
Vcc
5/12V
CURR.
FEED
Io/533
LEVEL
SHIFT
Vin/533
CURR.
LIMIT
CURR.
FEED
Io/533
LEVEL
SHIFT
Vin/533
OSC
CURR.
LIMIT
DVcc
5V
100k 5V
TKO+
TKO-
160kΩ
160kΩ26.5kΩ
26.5kΩ
160kΩ
160kΩ26.5kΩ
26.5kΩ
(open) TEST2
(open) TEST1
NC
LEVEL
SHIFT
Vin/1600
CURR.
FEED
Io/1600
PROTECT
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
Appendix1-Rev2.0
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Copyright © 2007 ROHM CO.,LTD.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
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FAX : +81-75-315-0172
Appendix
