Datasheet

UCC28C40, UCC28C41, UCC28C42, UCC28C43, UCC28C44, UCC28C45
UCC38C40, UCC38C41, UCC38C42, UCC38C43, UCC38C44, UCC38C45
SLUS458E -- AUGUST 2001 -- REVISED OCTOBER 2010
11
www.ti.com
TYPICAL CHARACTERISTICS
1k
10 k
100 k
1 k 10 k 100
k
1M
10 M
Figure 6
OSCILL
A
TOR FREQUENC
Y
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 -- Ω
f -- Frequency -- Hz
Figure 7
I
DISCH
-- Oscillator Discharge Current -- mA
T
J
-- Te mperature -- °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
Figure 8
f -- Frequency -- Hz
Gain -- (dB)
ERROR AMPLIFIER
FREQUENCY RESPONSE
1 10 100 10 k 100 k 1 M 10 M1k
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
Figure 9
COMP to CS OFFSET VOLTAGE (with CS = 0)
vs
TEMPERATURE
COMP to CS
T
J
-- Te mperature -- °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