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15
16
14
2
4
141
13
8
PVDD
VDD
CS
10OUT2
3
4
2
5
6
IN1
AGND
3V3
IN2
CLF
7
UCD7201
11OUT1
9PGND
12
NC
ILIM
NC
Bias Supply
Bias Winding
VIN
VOUT
13
UCC28089
GND
OUTA
OUTB
VDD
DIS
CS
3
1 SYNC
CT
UCD7201
SLUS645E –FEBRUARY 2005–REVISED NOVEMBER 2009
www.ti.com
Additional Application Circuits
Figure 2 shows the UCD7201 in a half-bridge converter design. The digital controller is performing the output
voltage compensation and all supervisory functions. The isolation amplifier is made up of a linear opto-coupler
configured for a gain of 1/10, so the output voltage is transformed to a level comparable with the ADC of the
digital controller.
Figure 2. Half-Bridge Converter
Figure 3 shows the UCD7201 in an analog only implementation of an intermediate bus converter. The ILIM pin of
the UCD7201 is exponentially increased at start-up, which minimizes overshoot on the output voltage. The
UCC28089 is a push-pull controller with fixed dead-time. The UCC28089 operates at a fixed duty cycle close to
100% so the circuit acts like a DC transformer linearly transforming the input voltage via the turns ratio of the
transformer.
Figure 3. Intermediate Bus Converter
10 Submit Documentation Feedback Copyright © 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): UCD7201