UCC28250 datasheet(39/48 Pages) TI

Part #	UCC28250

Description	Advanced PWM Controller With Pre-Bias Operation

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Manufacturer	TI [Texas Instruments]

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UCC28250

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SLUSA29A – APRIL 2010 – REVISED JUNE 2010

Design Steps

Step 1, Power Stage Design

The power stage design in this example is standard and the same as that for symmetrical half bridge converter of

voltage mode control. From the standard design, these components are determined. This includes Q1 through

Q4, C1, C2, CT1, D1 and D2, D3, T1, T2 and T3, and U6. Their design is standard. Also, design associated to

current sensing and protection is also standard. This includes CT1, D1, D2, R5 and C5.

Step 2, Feedback Loop Design

D3 (TLV431) with U6, R6, R9, R10, R12, R13, C11 and C12 are composed of standard type 3 feedback loop

compensation network and output voltage set point. Their design is also standard.

Table 1. Specifications for the Design Example

PARAMETER

MIN

TYP

MAX

UNITS

VIN

Input voltage

36

48

72

VDC

VOUT

Output voltage

3.3

POUT

Outpu power

75

W

IOUT

Output load current

23

A

COUT

Load capacitance

5000

µF

fSW

Switching frequency

150

kHz

PLIMIT

Over-power limit

150%

h

Efficiancy at full load

90%

Isolation

1500

V

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