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UC3842ADM Arkusz danych(PDF) 5 Page - Microsemi Corporation |
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UC3842ADM Arkusz danych(HTML) 5 Page - Microsemi Corporation |
5 / 8 page C URRENT M ODE PWM C ONTROLLER UC184xA/284xA/384xA PRODUCT DA T ABOOK 1996/1997 5 Copyright © 1995 Rev. 1.2 12/95 P RODUCTION D AT A S HEET CHARACTERISTIC CUR VES FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING RESISTOR 300 3.0k 100k 0 100k R T - (ohms) 10k 1M 1.0k 10.0k 30.0k C T = 1nF C T = 2.2nF C T = 4.7nF FIGURE 2. — MAXIMUM DUTY CYCLE vs. TIMING RESISTOR 300 3.0k 100k 0 40.0 R T - (ohms) 20.0 60.0 1.0k 10.0k 30.0k 80.0 100.0 Note: Output drive frequency is half the oscillator frequency for the UCx844A/5A devices. 8 4 5 V REF R T/CT GROUND R T C T For R T > 5k, f » 1.72 R T CT |
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