HY3842 Просмотр технического описания (PDF) - Unspecified

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Компоненты Описание

производитель

HY3842

Fixed Frequency Current Mode PWM Controller.

Unspecified 

HY3842/43/44/45

PIN FUNCTION

N FUNCTION

1 COMP

2 VFB

3 ISENSE

4 RT/CT

5 GROUND

6 OUTPUT

7 VCC

8 Vref

DESCRIPTION

This pin is the Error Amplifier output and is made for loop compensation.

This is the inverting input of the Error Amplifier. It is normally connected to the switching power supply

output through a resistor divider.

A voltage proportional to inductor current is connected to this input. The PWM uses this information to

terminate the output switch conduction.

The oscillator frequency and maximum Output duty cycle are programmed by connecting resistor RT

to Vref and capacitor CT to ground.

This pin is the combined control circuitry and power ground.

This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sink

by this pin.

This pin is the positive supply of the integrated circuit.

This is the reference output. It provides charging current for capacitor CT through resistor RT .

APPLICATION INFORMATION

Figure 1. Error Amp Configuration

HY3842 HY3843

HY3844 HY3845

Figure 2. Under voltage Lockout

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