SA5954 Datasheet, PDF (4/7 Pages) List of Unclassifed Manufacturers – SA5954

SA5954
(Continued)
Pin No.
Pin Name
Description
26
VINTK
Input for tracking driver
27
BIAS
Bias input
28
STBY
Standby
Notes: The indicated polarities for the output pins are under the condition that all inputs are (+).
The power supply are PVCC2 for the focus, tracking drivers are PVCC2, PVCC1 for the sled driver, and
VCC for the pre-block and loading driver. Therefore, make sure VCC̱PVCC1, 2.
APPLICATION INFORMATION
(1) Thermal shutdown
If the chip temperature rises above 175°C, the thermal shutdown (TSD) circuit is activated and the output
circuit enters the mute state, which is off state. The TSD circuit has a temperature hysteresis of 25°C.
(2) The driver buffer is switched off when the supply voltage falls below 3.5V (Typ.), and is switched back on
when the voltage reaches 3.7V (Typ.) again.
(3) The stand by circuit logic
Stand-by input voltage
operation
Below 0.5V or open
The stand-by function is activated so the bias block and power
block are disabled
Above 2.0V
Recover the normal operation
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0 2004.12.10
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