UC3842A 查看數據表（PDF） - Contek Microelectronics

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UC3842A

CURRENT MODE PWM CONTROL CIRCUITS

Contek Microelectronics 

UC3842A /3843A LINEARINTEGRATED CIRCUIT

ERROR AMPLIFIER CONFIGURATION

2.5V

0.5mA

Zi

2

Zf

1

Error amplifier can source or sink up to 0.5mA

CURRENT SENSE CIRCUIT

Is

1

Error

Amplifier

2R

R

R

3

Rs

C

5

Contek

1V

Current Sense

Comparator

Peak current (Is) determined by the formula:

Ismax=10V/Rs.

A small RC filter be required to suppress switch transients.

SLOPE COMPENSATION

8

RT

4

CT

R1

Isense

3

R2

C

Rsense

A fraction of the oscillator ramp can be resistively summed with the current sense signal to provide slope

compensation for converts requiring duty cycles over 50%.Note that capacitor C, forms a filter with R2 to suppress the

leading edge switch spikes.

Contek Microelectronics Co.,Ltd.

4

CONTEK

http://www.contek-ic.com E-mail:sales@contek-ic.com

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