PM8800 STMicroelectronics, PM8800 Datasheet - Page 27
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PM8800
Manufacturer Part Number
PM8800
Description
Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source
Manufacturer
STMicroelectronics
Datasheet
1.PM8800.pdf
(35 pages)
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PM8800A
PWM section
Figure 17. Short circuit on the output
Ch1 = 5Vout, Ch2 = SoftStart, Ch3 = VSS - GND, Ch4 = I input
When a severe over current occurs, like a short circuit of an internal power component, and
0.7 V level is reached on CS, the gate driver is instantaneously shut down and a fast hiccup
cycle is performed. When the 10 µA sink current fully discharges the SS capacitor, a new
soft-start procedure is performed.
In case of persistent severe over current, the control logic tries 4 cycles of fast hiccup before
shutting down the PWM controller at all.
To restart the device, after removing the cause of over current, VIN must be lowered under
UVLO level.
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