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UC3842BD1 Datasheet(PDF) 12 Page - STMicroelectronics |
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UC3842BD1 Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 15 page 
D95IN354 + R BIAS OSC C R + - + - EA R 2R R S Q 8 4 2 1 5 1mA 1V + - 5Vref 1M Ω Figure 24: Soft-Start Circuit D95IN355 + R BIAS OSC C R + - + - EA R 2R R S Q 8 4 2 1 5 1mA 1V 5Vref R2 R1 VClamp + - Comp/Latch 7 RS VCC Q1 Vin 7 6 5 BC109 VCLAMP = · R1 R1 + R2 where 0 <VCLAMP <1V Ipk(max) = VCLAMP RS Figure 25: Soft-Start and Error Amplifier Output Duty Cycle Clamp. UC2842B/3B/4B/5B - UC3842B/3B/4B/5B 12/15 |
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