TL1451A
DUAL PULSE WIDTH MODULATION CONTROL CIRCUITS
SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999
total device
PARAMETER
Standby supply current
Average supply current
† All typical values are at TA = 25°C unless otherwise indicated.
TEST CONDITIONS
Off-state
RT = 10 kΩ
TL1451AQ, TL1451AM
MIN TYP†
MAX
1.3
1.7
1.8
2.4
UNIT
mA
mA
PARAMETER MEASUREMENT INFORMATION
S1
0.47
µF
Test
Input
CPE
VCC = 5 V
RL
4.7 kΩ
RL
4.7 kΩ
16 15 14 13 12 11 10
9
OUT2
OUT1
TL1451A
1
2
3
4
5
6
7
8
CT
330 pF
RT
10 kΩ
Test
Input
Figure 1. Test Circuit
Oscillator Triangle Waveform
Error Amplifier Output
Dead-Time Input Voltage
Short-Circuit Protection
Comparator Input Voltage
PWM Comparator Output Voltage
2.0 V
1.6 V
1.4 V
1.25 V
H
L
Dead Time 100%
Output Transistor Collector
Waveform
Protection Enable
Terminal Waveform
Short-Circuit Protection
Comparator Output
Power Supply Voltage
2.8 V TYP
H
L
0.6 V
tpe†
0V
H
L
3.6 V
0V
† Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds
Figure 2. TL1451A Timing Diagram
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