UC2843B(2009) 查看數據表（PDF） - Unisonic Technologies

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UC2843B
(Rev.:2009)

HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

Unisonic Technologies 

UC2843B

Preliminary

„ APPLICATION INFORMATION

Error amplifier (EA) configuration circuit:

LINEAR INTEGRATED CIRCUIT

2.5V

VFB

Z1

COMP

Z2

Note: Error amplifier can source or sink up to 0.5mA.

Current-sense circuit:

EA

Error

Amplifier

0.5mA

Notes: 1. Peak current (IS) is determined by the formula: IS(max) = 1 V/RS

2. A small RC filter formed by resistor Rf and capacitor Cf may be required to suppress switch transients.

The oscillator frequency is set using the circuit:

VREF

RT

RT/CT

CT

GND

The frequency is calculated as followed:

f = 1 / RTCT

For RT > 5kΩ:

f = 1.72 / RTCT

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

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QW-R103-048.a

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