UC3842G(2007) Просмотр технического описания (PDF) - Unisonic Technologies

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производитель

UC3842G
(Rev.:2007)

HIGH PERFORMANCE CURRENT MODE CONTROLLER

Unisonic Technologies 

UC3842G

„ CURRENT SENSE CIRCUIT

Is

1

R

3

Rs

C

5

Error Amplifier

2R

R

LINEAR INTEGRATED CIRCUIT

1V

Current Sense Comparator

Peak current (IS) determined by the formula: ISMAX=1V/Rs. A small RC filter be required to suppress switch

transients

„ OSCILLATOR AND STANDBY MODE

We can judge the state of output load through the voltage of PIN1. In order to reduce the standby power, it will

reduce the OSC frequency at right load. When VCOMP≤2.2V, the OSC frequency begins to reduce. The normal

frequency is 52KHz, the minimum frequency is 14KHz.

VCOMP

2.2V

Increase

Normal

Frequency: 52KHz

Standby mode

Minimum frequency :14KHz

OSC triangle wave

1.2V

Normal

Frequency: 52KHz

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www.unisonic.com.tw

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QW-R103-036,A

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