UC3842 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

UC3842

CURRENT MODE PWM CONTROLLER

STMicroelectronics 

UC2842/3/4/5-UC3842/3/4/5

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 %

Figure 12 : Slope Compensation.

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.

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.

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