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47 pF
470 pF
4700 pF
CX:
Phase Shift
(Right Scale)
Closed-Loop Gain
(Left Scale)
VCC = 5 V
Rref = 15
Cref = 470 pF
TA = 25°C
50
30
20
0
70
40
100
1 k
10 k
100 k
1 M
Closed-Loop
Gain
dB
60
f Frequency Hz
10
0
°
10
°
20
°
30
°
40
°
50
°
60
°
70
°
80
°
90
°
Phase
Shift
Cx
Rref
Cref
Vref
39 k
39 k
+
Test Circuit
TL1451A-EP
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS614 – DECEMBER 2005
TYPICAL CHARACTERISTICS (continued)
Figure 21. Closed-Loop Gain and Phase Shift vs Frequency
15
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