ISL97642 Просмотр технического описания (PDF) - Renesas Electronics

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ISL97642

TFT-LCD DC/DC with Integrated Amplifiers

Renesas Electronics 

ISL97642

The current through MOSFET is limited to 2.8A (typ) peak.

This restricts the maximum output current based on Equation

3:

IOMAX = ILMT – ---2--I--L-  V-V----I-O-N--

(EQ. 3)

Where IL is peak to peak inductor ripple current, and is set by

Equation 4:

IL = -V---L-I--N--  -fD-S--

(EQ. 4)

where fS is the switching frequency.

SLOPE

COMPENSATION

CLOCK

SHUTDOWN

AND START-UP

CONTROL

IFB

IREF

CURRENT

AMPLIFIER

FBB

GM

AMPLIFIER

REFERENCE

GENERATOR

PWM

LOGIC

LX

BUFFER

IFB

IREF

COMP

PGND

FIGURE 17. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER

FN6436 Rev 0.00

June 18, 2007

Page 11 of 19

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