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AV3842A

CURRENT MODE PWM CONTROL CIRCUITS

Avic Technology 

@vic AV3842A / 3843A LINEAR INTEGRATED 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

R

Rs

1

3

C

5

Error

Amplifier

2R

R

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

R2

3

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.

QW-R103-002,B

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