PM8800ATR STMicroelectronics, PM8800ATR Datasheet - Page 27

• Manufacturer Part Number: PM8800ATR
• Description: IC POE-PD PWM CTLR 16-HTSSOP
• Manufacturer: STMicroelectronics

Specifications of PM8800ATR

• Applications: Power Over Ethernet (PoE)
• Interface: IEEE 802.3af
• Voltage - Supply: 10 V
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Mounting Type: Surface Mount
• For Use With: 497-6366 - BOARD EVAL FOR PM8800A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6897-2; PM8800ATR

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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