- Texas Instraments 48-V to 3.3-V Forward Converter with Active Clamp Reset Model SLUU178A User's Guide

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t − Time − 1 µs/div
V
IN
= 36 V
6.3 V, QF Gate (J5)
(5 V/div)
8.4 V, QR Gate (J6)
(5 V/div)
SR Gate Drive
t − Time − 2.5 µs/div
V
IN
= 36 V
I
OUT
= 30 A
50 mV/div
23 mV peak-to-peak
Output Ripple Voltage
t − Time − 1 µs/div
V
IN
= 72 V
12.3 V, QF Gate (J5)
(5 V/div)
5.4 V, QR Gate (J6)
(5 V/div)
SR Gate Drive
t − Time − 2.5 µs/div
V
IN
= 48 V
I
OUT
= 10 A
V
PRI
(40 V/div)
I
PRI
(0.5 A/div)
Transformer Primary
Power Up/Down Test Procedures
Figure 12.
Figure 10.
Figure 13.
Figure 11.
12 Using the UCC2891 Active Clamp Current Mode PWM Controller SLUU178A – November 2003 – Revised December 2006
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