IL3842N Ver la hoja de datos (PDF) - Integral Corp.

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componentes Descripción

Fabricante

IL3842N

Fixed Frequency Current Mode PWM Controller

Integral Corp. 

IL3842

PIN FUNCTION DESCRIPTION

Pin

No.

Function

Description

1 Compensation

This pln is the Error Amplifier output and is made available for loop compensation

2 Voltage Feedback

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

power supply outpul through a resistor divider.

3 Current Sense

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

5 GND

6 Output

7 Vcc

The Oscillator frequency and maximum Output duty cycle are programmed by connecting

resistor RT to VREF and capacitor CT to ground. Operation to 500kHz is possible.

This pin is the combined conlrol circuitry and power ground

This output directly drives the gate of a power MOSFET. Peak currents up to 1,0A are

sourced and sunk by this pin.

This pin is the positive supply of the control IC.

8 VREF

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

RT

ABSOLUTE MAXIMUM RATINGS

Characteristic

Total Power Supply and Zener Current

Output Current

Output Energy (Capacitive Load per Cycle)

Error Amp Output Sink Current

Current Sense and Voltage Feedback Inputs

Maximum Power Dissipation @ TA= 25oC:

Thermal Resistance,Junction-to-Air

Operating Junction Temperature

Storage Temperature Range

Symbol

(ICC+ IZ)

IO

W

IOE

Vin

PD

RθJA

TJ

Tstg

Value

30

±1.0

5.0

10

-0.3 to 5.5

0.862

145

+150

-65 ~ +150

Unit

mA

A

µJ

mA

V

W

°C/W

oC

oC

2

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