BD7755RFV-E2 Datasheet, PDF (1/21 Pages) Rohm – System Motor Driver IC for Half Height Drive (Sensor less)

System Motor Driver ICs for CD / DVD / Blu-ray Drive and Recorder
System Motor Driver IC
for Half Height Drive (Sensor less)
BD7755RFV
No.10012EAT01
●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
Parameter
Symbol
Ratings
Unit
POWER MOS power supply voltage 1
POWER MOS power supply voltage 2
SPVM, SLVM
SAVM
15
#1
V
7
#2
V
Preblock/BTL power block power supply voltage Vcc, AVM, LDVM
15
V
PWM control block power supply voltage
Power dissipation
DVcc
Pd
7
V
1.5
#3
W
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℃
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2010.06 - Rev.A