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PM8800ATR Datasheet(PDF) 27 Page - STMicroelectronics

No. de pieza PM8800ATR
Descripción Electrónicos  Integrated IEEE 802.3af compliant PoE-PD interface and PWM controller with support of external source
PDF  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM8800ATR Datasheet(HTML) 27 Page - STMicroelectronics

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PM8800A
PWM section
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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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