RT9603CS Просмотр технического описания (PDF) - Richtek Technology
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RT9603CS Datasheet PDF : 10 Pages
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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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