RT9603CS 查看數據表（PDF） - Richtek Technology

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RT9603CS

Synchronous-Rectified Buck MOSFET Drivers

Richtek Technology 

Preliminary

Over-Voltage Protection Function at Power-On

An unique feature of the RT9603 driver is the addition of

over-voltage protection in the event of upper MOSFET

direct shorted before power-on. The RT9603 detects the

fault condition during initial start-up, the internal power-

on OVP sense circuitry will rapidly drive the output lower

MOSFET on before the multi-phase PWM controller takes

control.

Figure 6 shows the measured waveforms with the high

side MOSFET directly shorted to 12V.

VCC

SW

DRVL

VCORE

Figure 6. Waveforms at High Side MOSFET Shorted

Please note that the VCC trigger point to RT9603 is at

3V, and the clamped level on SW pin is at about 2.4V.

Obviously since the SW pin voltage increases during

initial start-up, the VCORE increases correspondingly, but

it would quickly drop-off followed by DRVL and VCC

decreased.

RT9603

DS9603-00 November 2003

www.richtek.com

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