LND3842B 查看數據表（PDF） - Linear Dimensions Semiconductor

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LND3842B

Current Mode PWM Controller

Linear Dimensions Semiconductor 

LND3842/43/44/45

Note 1: Parameter measured at trip point of latch with Vpin2=0

Note 2: Gain defined as A=∆Vpin1/=∆Vpin3 : 0≤ Vpin3≤0.8V.

Note 3: These parameters, although guaranteed, are not 100% tested in production.

PIN DESCRIPTION

No

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 sinked 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.

TYPICAL APPLICATIONS

2.5V

+

1mA

2

-

1

Figure 1. Error Amp Configuration

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

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