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UC3842 Datasheet(PDF) 8 Page - STMicroelectronics

Part # UC3842
Description  CURRENTMODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3842 Datasheet(HTML) 8 Page - STMicroelectronics

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Figure 11 : Off-line Flyback Regulator.
Power Supply Specifications
1. Input Voltage :
95 VAC to 130 VAC
(50 Hz/60 Hz)
2. Line Isolation :
3750 V
3. Switching Frequency :
40 KHz
4. Efficiency @ Full Load : 70 %
5. Output Voltage :
A. + 5 V,
± 5 % : 1 A to 4 A load
Ripple voltage : 50 mV P-P Max.
B. + 12 V,
± 3 % : 0.1 A to 0.3 A load
Ripple voltage : 100 mV P-P Max.
C. – 12 V,
± 3 % : 0.1 A to 0.3 A load
Ripple voltage : 100 mV P-P Max.
Figure 12 : Slope Compensation.
A fraction of the oscillator ramp can be resistively
summed with the current sense signal to provide
slope compensation for converters requiring duty
cycles over 50 %.
Note that capacitor, C, forms a filter with R2 to su-
press the leading edge switch spikes.
UC2842/3/4/5-UC3842/3/4/5
8/11


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