AN013 datasheet(1/6 Pages) AIC

Part #	AN013

Description	Optimized external driver for AIC1639

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Manufacturer	AIC [Analog Intergrations Corporation]

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AN013

July 2000

1

Optimized external driver for AIC1639

Introduction

AIC1639 is a member of AIC1638 PFM （ Pulse

Frequency Modulation ） controller IC family, for

step-up DC/DC converter featuring high efficiency

and low ripple voltage, which is exactly the same as

AIC1638 except

the external driver with higher

output current comparing to the built-in edition

( AIC1638 ). The figures are shown below ：

The key electrical characteristics of

AIC1639

ü

PFM based control

ü

75% ( Typ. ) oscillator duty cycle , 100KHz

( Typ. ) switching frequency

ü

Low start up voltage

Figure 1a

Figure 1b

Principle of step-up DC/DC converter

operation

A step-up DC/DC converter charges energy in the

inductor when the switch is on and discharges the

energy with additional energy from Input Power

Source thereto. Therefore a higher voltage output,

than input, is obtained.

The operation will be explained with reference to

the following diagrams ：

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