Datasheet

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I
DISCH
− Oscillator Discharge Current − mA
T
J
− Temperature − °C
9.0
9.5
8.0
7.5
7.0
8.5
−50 −25 0 25 50 75 100 125
OSCILLATOR DISCHARGE CURRENT
vs
TEMPERATURE
1 k
10 k
100 k
1 k 10 k 100 k
1 M
10 M
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE AND CAPACITANCE
CT = 220 pF
CT = 4.7 nF
CT = 2.2 nF
CT = 1 nF
CT = 470 pF
R
T
− Timing Resistance − W
f − Frequency − Hz
f − Frequency − Hz
Gain − (dB)
ERROR AMPLIFIER
FREQUENCY RESPONSE
1 10 100 10 k 100 k 1 M 10 M1 k
10
0
20
200
180
140
120
80
40
0
60
100
160
20
30
40
50
60
70
80
90
100
Phase Margin − (°)
GAIN
PHASE
MARGIN
COMP to CS OFFSET VOLTAGE (with CS = 0)
vs
TEMPERATURE
COMP to CS
T
J
− Temperature − °C
0.2
1.8
1.4
1.2
0.8
0.4
0.0
0.6
1.0
1.6
−50 −25 0 25 50 75 100 125
UCC28C4x-EP
BiCMOS LOW-POWER CURRENT-MODE PWM CONTROLLERS
SGLS352B – DECEMBER 2006 – REVISED MAY 2007
APPLICATION INFORMATION (continued)
Figure 6. Figure 7.
Figure 8. Figure 9.
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