UC3842GL-S08-R datasheet(7/8 Pages) ETL

部件名	UC3842GL-S08-R

功能描述	HIGH PERFORMANCE CURRENT MODE CONTROLLER

PDF	8 Pages

Scroll/Zoom	100%

制造商	ETL [E-Tech Electronics LTD]

网页	http://e-tech.com.hk

标志

7 / 8 page

UC3842G

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

7 of 8

www.unisonic.com.tw

QW-R103-036.C

CURRENT SENSE CIRCUIT

R1V

Error Amplifier

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 Pin 1. 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 22KHz.

2.2V

1.2V

Standby mode

Minimum frequency :14KHz

Normal

Frequency: 52KHz

Normal

Frequency: 52KHz

VCOMP

Increase

OSC triangle wave

UC3842GL-S08-R 数据表(PDF) 7 Page - E-Tech Electronics LTD