AMC3843B datasheet(7/11 Pages) ADDTEK

Part #	AMC3843B

Description	CURRENT MODE PWM CONTROLLER

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Manufacturer	ADDTEK [ADDtek Corp]

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AMC3842B/43B/44B/45B

Copyright

7

DD019_F

--

OCTOBER 2006

APPLICATION INFORMATION

Fig. 1. Current Sense Circuit

Peak current (IS) is set by: IS(MAX) = 1V/RS

Fig. 3. Oscillator Section

1.72

Fig. 2. Error Amplifier Configuration - the

amplifier can source or sink up to 0.5mA

For RT < 5K, f =

RTCT

Fig. 4. Open-loop laboratory test fixture: Careful grounding techniques are necessary for high peak currents

associated with capacitive loads. Timing and bypass capacitors should be connected to GND pin in a single

point ground. The transistor and 5K potentiometer are used to sample the oscillator waveform and apply an

adjustable ramp to the ISENSE pin

GND

ISENSE

COMP

Error

Amp

RS

Rf

Cf

R

2R

1V

Current

Sense

Comparator

4.7K

1K

Error AMP

Adjust

4.7K

2N2222

100K

5K

ISENSE

Adjust

COMP

VFB

ISENSE

RT/CT

GND

VREF

VCC

Output

0.1

µF

Output

1K,

1W

VCC

VREF

0.1

µF

GND

CT

RT

2.5V

Zf

Zi

0.5mA

VFB

COMP

Error

Amp

GND

RT/CT

VREF

CT

RT

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