SA5624 Datasheet, PDF (4/7 Pages) Silan Microelectronics Joint-stock – ACTUATOR DRIVER WITH CURRENT FEEDBACK FOR CD - ROM / DVD

SA5624
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 175ć, the thermal shutdown (TSD) circuit is activated and the output
circuit enters the mute state, that is off state. The TSD circuit has a temperature hysteresis of 25ć.
(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
(4) Current feedback driver
Trans conductance (output current/input voltage) is shown as below
Gm = 1/(Rd + Rwire) (A/V)
Rwire is the total wire resistance inside the package, Rwire≈0.15Ω±0.05Ω(typ)
ELECTRICAL CHARACTERISTICS CURVES
Fig 1. Thermal dissipation curve
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1 2005.06.21
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