SA5901 Datasheet, PDF (10/24 Pages) Silan Microelectronics Joint-stock – 4-CHANNEL MOTOR DRIVER FOR PORTABLE CD PLAYER

SA5901
FUNCTION DESCRIPTION
H-bridge driver
(Gain setting)
Driver input resistance is 11kΩ (typ.) for CH1, CH3 and CH4 and 7.5 kΩ for CH2.
Calculate driver gain with the under-mentioned expression and set it.
Ch1, Ch3, Ch4
Ch2
GV=20log|
55K
11K +R
|
(dB)
GV=20log|
110K
7.5K +R
|
(dB)
The power supply of drive output stage is HVCC pin (36-pin) and that of pre-drive circuit is VSYS2 pin (15-pin).
Attach by-pass capacitor (approximately 0.1µF) to the legs of this IC between the power supplies.
(Mute function)
Brake function and mute function are assigned to CH1 and other channels of the four channels respectively.
When BRAKE1 pin (23-pin) has been set to “H”, the output of CH1 becomes “L”for both pin 31 and pin 32, and
enters a brake mode.
When MUTE2 pin (21-pin) has been set to “H”, the output of CH2 is muted.
When MUTE34 pin (19-pin) has been set to “L”, the output of CH3 and that of CH4 are muted simultaneously.
(VREF drop mute)
When the voltage impressed to VREF pin (16-pin) is 1.0V (typ.) orless, impedance of driver output becomes
‘high”.
(Thermal shutdown)
When the chip temperature has been 150°C(typ.), the output current is cut.
When the chip temperature has dropped to 120°C(typ.), the output current begins to flow.
PWM power supply drive unit
This unit detects a maximum output level of drivers of four channels and performs the PWM supply of load
drive power supply (36-pin). This unit uses PNP transistor, coil, schottky diode and capacitor as external
component.
10P
2200P 100K
44
PWMFIL
47
37
PSW
33­
47­
SBD
36
HVCC
0.1­
DC/DC converter
(Output voltage)
Booster circuit of 3.2V(typ.) can be configured with external components. This voltage varies depending on
addition of external components. How to set the voltage is as follows:
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.3 2006.02.27
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