Datasheet

UCC28250
SLUSA29C –APRIL 2010– REVISED JULY 2011 www.ti.com
TERMINAL FUNCTIONS
QFN-20 PW-20 NAME I/O FUNCTION
5 12 VDD I Bias supply input.
20 7 VREF O 3.3-V reference output.
18 5 EN I Device enable and disable.
15 2 RT I Oscillator frequency set or synchronous clock input.
12 19 SP I Synchronous rectifier off to primary on dead-time set .
11 18 PS I Primary off to synchronous rectifier on dead-time set .
PWM ramp input (for voltage mode control) or current sense input (for current
16 3 RAMP/CS I
mode control).
1 8 REF/EA+ I Error amplifier non-inverting input.
2 9 FB/EA- I Error amplifier inverting input.
3 10 COMP I/O Error amplifier output.
14 1 VSENSE I Output voltage sensing for pre-bias control.
13 20 SS I/O Soft-start programming.
17 4 ILIM I Current sense for cycle-by-cycle over-current protection.
10 17 HICC I Cycle-by-cycle current limit time delay and Hiccup time setting.
19 6 OVP/OTP I Over voltage and over temperature protection pin.
9 16 OUTA O 0.2-A sink/source primary switching output.
8 15 OUTB O 0.2-A sink/source primary switching output.
7 14 SRA O 0.2-A sink/source synchronous rectifier output.
6 13 SRB O 0.2-A sink/source synchronous rectifier output.
4 11 GND I Ground.
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