Datasheet

UCC2897A
SLUS829D -- AUGUST 2008 -- REVISED JULY 2009
30
www.ti.com
TYPICAL CHARACTERISTICS
Figure 20
OSCILL
A
TOR FREQUENC
Y
vs
JUNCTION TEMPERATURE
T
J
-- Junction Temperature -- °C
225
230
235
260
270
275
240
--50 --25 0 25 50 75 100 12
5
245
250
255
265
R
ON =
R
OFF
=75kΩ
f
SW
-- Switching Frequency -- kHz
--50 --25 0 25 50 75 100 125
67
66
69
68
70
72
71
73
74
Figure 21
MAXIMUM DUTY CYCLE
vs
JUNCTION TEMPERATURE
D
MAX
-- Maximum Duty Cycle -- %
T
J
-- Junction Temperature -- °C
R
ON =
R
OFF
=75kΩ
Figure 22
CURRENT SENSE THRESHOLD
V
OLT
A
GE
vs
JUNCTION TEMPERATURE
V
CS
-- Current Sense Threshold Voltage -- V
T
J
-- Junction Temperature -- °C
0
0.2
0.4
1.0
1.2
1.4
--50 --25 0 25 50 75 100 125
0.6
0.8
Hiccup Mode
Cycle-by-Cycle Current Limit
Figure 23
SYNCHRONIZATION THRESHOLD VOLTAGE
vs
JUNCTION TEMPERATURE
V
SYNC
-- Synchronization Threshold Voltage -- V
--50 --25 0 25 50 75 100 125
2.10
2.15
2.20
2.35
2.45
2.50
2.30
2.25
2.40
T
J
-- Junction Temperature -- °C