UC3842A-D08-T Просмотр технического описания (PDF) - Unisonic Technologies

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UC3842A-D08-T

CURRENT MODE PWM CONTROL CIRCUITS

Unisonic Technologies 

UC3842A/3843A

OPEN-LOOP LABORATORY TEST FIXTURE

LINEAR INTEGRATED CIRCUIT

Error

Amp

Adjust

RT

1

2

3

5kΩ

4

CT

VREF

8

A

Vcc

7

1kΩ

/ 1W

6

OUTPUT

5

High peak current associated with capacity loads necessitate careful grounding techniques. Timing and bypass

capacitors should be connected close to pin 5 in single point GND. The transistor and 5kΩ potentio-meter are used

to sample the oscillator waveform and apply an adjustable Ramp to Pin 3.

UNDER-VOLTAGE LOCKOUT

Vcc

7

Icc

ON/OFF Command

to rest of IC

<15mA

Von=16V

Voff=10V

<1mA

Voff

Von

Vcc

During Under-Voltage Lockout, the output driver is biased to a high impedance state. Pin 6 should be shunt to

GND with a bleeder resistor to prevent activating the power switch with output leakage currents.

ERROR AMPLIFIER CONFIGURATION

2.5V

Zi

2

Zf 1

0.5mA

Error amplifier can source or sink up to 0.5mA

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5 of 9

QW-R103-002,D

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