Datasheet
Table Of Contents
- NATURAL INTERLEAVING FEATURES
- SYSTEM FEATURES
- APPLICATIONS
- CONTENTS
- DESCRIPTION
- ABSOLUTE MAXIMUM RATINGS
- DISSIPATION RATINGS
- RECOMMENDED OPERATING CONDITIONS
- ELECTROSTATIC DISCHARGE (ESD) PROTECTION
- ELECTRICAL CHARACTERISTICS
- DEVICE INFORMATION
- TYPICAL CHARACTERISTICS
- APPLICATION INFORMATION
- Theory of Operation
- On-Time Control, Maximum Frequency Limiting, and Restart Timer
- Natural Interleaving
- Phase Management
- Zero Crossing Detection and Valley Switching
- Brownout Protection
- Failsafe OVP—Output Over-Voltage Protection
- Over-Current Protection
- Phase Fail Protection
- Distortion Reduction
- Improved Error Amplifier
- Open-Loop Protection
- Soft-Start
- Light-Load Operation
- Command for the Downstream Converter
- VCC Undervoltage Protection
- VCC
- DESIGN EXAMPLE
- ADDITIONAL REFERENCES

PhaseShiftofGDARelativetoGDB - Degrees
110
108
106
90
150 160 170 180 190 200 210
K
/K %
-
T
T0
104
102
100
98
96
94
92
R =266kW
TSET
R =133kW
TSET
R =66kW
TSET
K =
T0
2(K K )´
TA TB
K +K
TA TB
GDA GDB
T Temperature C°
J
- -
300
275
250
100
-40 -20 0 20 40 60 80 100 120
PWMRestartTime
s
- m
225
200
175
150
125
V InputACVoltageSense V
VINAC
- -
100
0.1
0 0.5 1.0 1.5 2.0 2.5 3.0
AdditionalOn-Time s- m
10
1
R =266k
TSET
W
R =133k
TSET
W
R =66kW
TSET
UCC28061
www.ti.com
.............................................................................................................................................................. SLUS837A – JUNE 2008 – REVISED JULY 2009
TYPICAL CHARACTERISTICS (continued)
At VCC = 16 V, AGND = PGND = 0 V, VINAC = 3 V, VSENSE = 6 V, HVSEN = 3 V, PHB = 5 V, R
TSET
= 133 k Ω ; all voltages
are with respect to GND, all outputs unloaded, T
J
= T
A
= +25 ° C, and currents are positive into and negative out of the
specified terminal, unless otherwise noted.
ON-TIME FACTOR PWM RESTART TIME
vs vs
PHASE SHIFT TEMPERATURE
Figure 21. Figure 22.
ADDITIONAL ON-TIME
vs
VINAC ZERO-CROSSING DISTORTION CORRECTION
Figure 23.
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