Datasheet

 
 

SLUS542F − OCTOBER 2003 − REVISED JULY 2009
30
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TYPICAL CHARACTERISTICS
Figure 23
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
T
J
− Junction Temperature − °C
225
230
235
260
270
275
240
−50 −25 0 25 50 75 100 1
25
245
250
255
265
R
ON =
R
OFF
= 75 kΩ
f
SW
− Switching Frequency − kHz
−50 −25 0 25 50 75 100 125
67
66
69
68
70
72
71
73
74
Figure 24
MAXIMUM DUTY CYCLE
vs
JUNCTION TEMPERATURE
D
MAX
− Maximum Duty Cycle − %
T
J
− Junction Temperature − °C
R
ON =
R
OFF
= 75 kΩ
Figure 25
CURRENT SENSE THRESHOLD VOLTAGE
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 12
5
0.6
0.8
UCC2892/UCC2894
UCC2891/UCC2893
Figure 26
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