UC3844L DIP-8 UTC – 2000 pc Box (Rs.8/Pc)

FEATURES
*

– Operation output switching frequency up to 500 kHz

– Automatic feed forward compensation

– Latching PWM for cycle-by-cycle current limiting 

– High current totem pole output 

– Internally trimmed reference with under voltage lockout 

– UVLO with hysteresis
* Low startup and operating current

PIN DESCRIPTION
PIN NO PIN NAME FUNCTION

1 Compensation Error amplifier output, this pin is made available for loop compensation.

2 VFB
Voltage Feedback, the inverting input of the Error Amplifier. It is normally connected to the
switching power supply output through a resistor divider.

3 ISENSE
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.

4 RT/CT
The Oscillator frequency and maximum output duty cycle are programmed by connecting
resistor RT to Vref and capacitor CT to ground. Operation to 1 MHz is possible.

5 GND Power ground.

6 Output This output directly drives the gate of a power MOSFET. Peak currents up to 1A are
sourced and sunk by this pin. The output switches at one-half the oscillator frequency.

7 VCC Positive supply.

8 VREF Reference output, provides charging current for capacitor CT though resistor RT.