ISL97642 Просмотр технического описания (PDF) - Intersil

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ISL97642

TFT-LCD DC/DC with Integrated Amplifiers

Intersil 

ISL97642

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

This restricts the maximum output current based on

Equation 3:

IOMAX

=

⎝⎛ILMT – -Δ--2--I--L-⎠⎞

× V-----I--N--

VO

(EQ. 3)

Where ΔIL is peak to peak inductor ripple current, and is set

by Equation 4:

ΔIL

=

-V----I--N--

L

×

-D---

fS

(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

LX

LOGIC

BUFFER

IFB

IREF

COMP

PGND

FIGURE 17. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER

11

FN6436.0

June 18, 2007

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