SG2524, SG3524
REGULATING PULSE WIDTH MODULATORS
SLVS077D – APRIL 1977 – REVISED FEBRUARY 2003
TYPICAL CHARACTERISTICS
OPEN-LOOP VOLTAGE AMPLIFICATION
OF ERROR AMPLIFIER
vs
FREQUENCY
90
80
70
60
50
40
30
20
10
0
RL is resistance from COMP to ground
–10
100
1k
10 k
100 k
1M
Frequency – Hz
10 M
100
1
2
4
7
10
20
40
70 100
RT – Timing Resistance – kΩ
RL =
∞
1M
VCC = 20 V
TA = 25°C
f osc – Oscillator Frequency – Hz
400 k
100 k
40 k
CT = 0
CT = 0.001
µF
CT = 0.003
µF
CT = 0.01
µF
Open-Loop Voltage Amplification of Error Amplifier – dB
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
Output Dead Time –
µs
6
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RL = 1 MΩ
RL = 300 kΩ
RL = 100 kΩ
RL = 30 kΩ
10 k
4k
CT = 0.03
µF
CT = 0.1
µF
VCC = 20 V
TA = 25°C
1k
400
Figure 3
OUTPUT DEAD TIME
vs
TIMING CAPACITANCE
10
Figure 4
4
1
0.4
0.1
0.001
0.01
0.004
0.04
CT – Timing Capacitance –
µF
0.1
Figure 5
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•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
