PM8800ATR STMicroelectronics, PM8800ATR Datasheet - Page 31

• 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
Auxiliary sources
If the current forced into AUXII pin is lower than 60 µA, the internal under voltage lock out
threshold will be lowered but AUXII connection will be not prevalent to the PoE; in this case
power to the DC/DC converter will be drawn from the source that has been applied first.
In case of very low auxiliary voltage (i.e. lower than 15 V) is recommended to supply VCC
directly with the auxiliary voltage through a bypass diode, in order to assure a proper
operation of the pwm section of PM8800A.
Figure 20. Switch over between 48 V PoE and 12 V AUXII auxiliary adapter
Ch3
Ch2
Ch1 = 5 Vout, Ch2 = Aux voltage, Ch3 = internal primary voltage, Ch4 = Aux input current
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