EL7513 データシートの表示（PDF） - Intersil

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EL7513

White LED Step-Up Regulator

Intersil 

EL7513

Block Diagram

2.6V TO

5.5V

CIN

4.7µF

VIN

REFERENCE

GENERATOR

1MHz

OSCILLATOR

THERMAL

SHUTDOWN

OVER-VOLTAGE

PROTECTION

L

33µH

VOUT

LX

COMP

CCOMP

0.1µF

PWM

SIGNAL

VCNTL CNTL

617K

50K

+++

BOOST

I-SENSE

START-UP

CONTROL

ERROR AMP

+

-

PWM

LOGIC

I(LED)

PGND

CS

5Ω

SGND

COUT

1µF

Typical Performance Curves

All performance curves and waveforms are taken with C1 = 4.7µF, C2 = 1µF, C3 = 0.1µF, L = 33µF, VIN = 3.3V, VCNTL = 1V, R1 = 5Ω, 4 LEDs in a

series; unless otherwise specified.

1.05

1.04

1.03

1.02

1.01

1

2.5

3

3.5

4

4.5

5

5.5

VIN (V)

FIGURE 1. SWITCHING FREQUENCY vs VIN

3.5

VCNTL=0V, 0.1V

3 WHITE LEDs DISCONNECTED

2.5

2

1.5

1

0.5

0

2.5 4.5 6.5 8.5 10.5 12.5 14.5

VIN (V)

FIGURE 2. QUIESCENT CURRENT

4

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