Datasheet

LM5072
www.ti.com SNVS437D –MARCH 2006–REVISED APRIL 2013
PIN DESCRIPTIONS
Pin Number Name Description
1 RT PWM controller oscillator frequency programming pin.
2 SS Soft-start programming pin.
3 VIN Positive supply pin for the PD interface and the internal PWM controller start-up regulator.
4 RCLASS PD classification programming pin.
5 ICL_FAUX Inrush current limit programming pin; also the front auxiliary power enable pin.
6 DCCL PD interface DC current limit programming pin.
7 VEE Negative supply pin for PD interface; connected to PoE and/or front auxiliary power return path.
8 RTN PWM controller power return; connected to the drain of the internal PD interface hot swap
MOSFET; should be externally connected to the reference ground of the PWM controller.
9 OUT PWM controller gate driver output pin.
10 VCC PWM controller start-up regulator output pin.
11 nPGOOD PD interface Power Good indicator and delay timer pin; active low state indicates PoE interface is in
normal operation.
12 CS PWM controller current sense input pin.
13 RAUX Rear auxiliary power enable pin; can be programmed for auxiliary power dominance over PoE
power.
14 FB PWM controller voltage feedback pin and inverting input of the internal error amplifier; connect to
ARTN to disable the error amplifier in isolated dc-dc converter applications.
15 COMP Output of the internal error amplifier and control input to the PWM comparator. In isolated
applications, COMP is controlled by the secondary side error amplifier via an opto-coupler.
16 ARTN PWM controller reference ground pin; should be shorted externally to the RTN pin as a single point
ground connection to improve noise immunity.
EP Exposed metal pad on the underside of the device. It is recommended to connect this pad to a PC
Board plane connected to the VEE pin to improve heat dissipation.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Links: LM5072