Datasheet

START
VDD > 13V?
Soft Start
Monitor V
FB
V
FB
> 2.0V1.4V < V
FB
< 2.0VV
FB
< 1.4V
Fixed V/s
Freq. Foldback
(Light Load)
Quasi-Resonant
Mode or DCM
(Normal Load)
V
FB
< 0.5V
VDD < 8V?
REF < 4V?
OVP = Logic High?
OT = Logic High?
OC = Logic High
RUN = Logic High
STATUS = Hi Z
Y
N
Y
Y
RUN = Logic Low
STATUS = Hi Z
Fixed V-sec
40kHz Burst
N
N
Fixed V/s
40kHz
Zero Pulses
STATUS = Hi Z
(In Green-Mode)
V
FB
> 1.2V?V
FB
> 1.5V?
STATUS = 0V
(In Run-Mode)
STATUS = 0V
(In Run-Mode)
STATUS = 0V
(In Run-Mode)
N
N
YY
RUN = Logic Low
Continuous Fault
Monitor
UCC28600
SLUS646J –NOVEMBER 2005– REVISED JULY 2011 www.ti.com
Figure 3. Control Flow Chart
12 Copyright © 2005–2011, Texas Instruments Incorporated