EPR-86 datasheet(9/28 Pages) POWERINT

Part #	EPR-86

Description	Engineering Prototype Report for EP 86 - 6.6 W Multi-Class Powered Device (PD) for Power over Ethernet (PoE) Using DPA-Switch-(DPA423G)

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Manufacturer	POWERINT [Power Integrations, Inc.]

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9 / 28 page

13-Apr-2006

EP-86 – 6.6 W, 3.3 V, 2 A PoE Powered Device

Page 9 of 28

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Q2 is on, and sinks additional current from the resistor (R5) that connects the L pin to the

DC input voltage. The value of R14 was selected so that an extra 10 µA is drawn at

startup, which increases the turn-on threshold voltage to 41 VDC typical. However,

because Q2 turns off after start-up, the UV turn-off threshold stays at 34 VDC (see DI-

101 for more details).

Figure 7 –

L-pin current without and with the widened UV hysteresis circuit.

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