UC1842AAD Просмотр технического описания (PDF) - Microsemi Corporation
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UC1842AAD Datasheet PDF : 8 Pages
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PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
CHARACTERISTIC CURVES
FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING
RESISTOR
1M
100k
10k
CT = 1nF
CT = 2.2nF
CT = 4.7nF
0
300
1.0k 3.0k 10.0k 30.0k 100k
RT - (ohms)
VREF 8
RT
RT/CT 4
CT
GROUND 5
For RT > 5k, f »
1.72
RT CT
Note: Output drive frequency is half the oscillator frequency for
the UCx844A/5A devices.
FIGURE 2. — MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
100.0
80.0
60.0
40.0
20.0
0
300
1.0k 3.0k 10.0k 30.0k 100k
RT - (ohms)
Copyright © 1995
Rev. 1.2 12/95
5
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