SC5010ULTRT【PDF 1/1 页】IC LED DRVR BACKLIGHT I2C 28QFN

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SC5010

High Effi ciency 8-Channel LED Driver with

I 2 C Interface and Phase-Shifted PWM Dimming

POWER MANAGEMENT

Features

Description

VIN Range — 4.5V to 27V, VOUT Range — Up to 50V

Step-up (Boost) Controller

The SC5010 is an 8-channel high-precision, high-effi ciency

step-up (Boost) LED driver for backlight applications. It fea-

Excellent Transient Response

Programmable Switching Frequency

tures wide input voltage range (4.5V to 27V) , flexible output

configuration, wide analog and PWM dimming range,

Linear Current Sinks

phase shifting and fading. It also features video signal syn-

8 Strings, up to 30mA/String

Current Matching ±1%

Current Accuracy ±1.5%

chronization (VSYNC), I 2 C interface, and numerous protec-

tion features. An optional disconnect p-MOSFET provides

true load disconnection and inrush current limiting.

PWM Dimming

String-by-String Phase Shifting

Input Dimming Frequency 100Hz-30kHz

User Selectable 9 or 10 Bits Dimming Resolution

Optional Synchronization to VSYNC/HSYNC S ignal

The boost controller, with programmable switching fre-

quency from 200kHz to 2.2MHz, maximizes effi ciency by

dynamically minimizing the output voltage while maintain-

ing LED string current accuracy. It provides excellent line

5-bit Analog Dimming

Optional External p-MOSFET Disconnect Switch

and load response with no external compensation compo-

nents. Each linear current sink is matched within ±1% for

True Load Disconnect and Inrush Current Limiting

superb lighting uniformity, and the accuracy of each string

I 2 C Interface

current is ±1.5%. An external resistor adjusts the current

Fault Status — Open/Short LED, UVLO, OTP

Device Control — SYNC Freq, PLL Setting

from 10-30mA per string. It also features PWM dimming

resolution of 9 or 10 bits (user selectable) over dimming

Protection Features

frequency from 100Hz to 20kHz, synchronized to the SYNC

Open/Shorted LED(s) and adjustable OVP

Over-Temperature and UVLO Shutdown Protection

signal or the boost oscillator. String-by-string phase shifting

reduces the demand on the input/output capacitance,

4 X 4(mm) 28-pin QFN Package

decreases EMI, and improves dimming linearity.

Applications

SC5010 is available in a low-profile, thermally enhanced,

Notebook PCs, UMPC, LCD Monitors, and Tablet PCs

4 X 4 X 0.6(mm) QFN 28-pin package.

Typical Application Circuit

D 1 V O U T u p to 5 0 V

V IN = 4 .5 to 2 7 V

V C C = 4 .5 to 5 .5 V

(O p tio n a l)

DRVP

V IN

UVLO

VCC

2.2 μ H

SC5010

DRVN

OVP

4.7 μ F

FLT

F o r I 2 C

SYNC

PW MI

R10

R11

FLT

SDA

SCL

SYNC

PW MI

SCP

FSET

IS E T

CPLL

IO 1

IO 2

IO 3

IO 4

IO 5

IO 6

IO 7

IO 8

AGND

PGND

U p to

3 0 m A /C H

Revision 1.0

? 2011 Semtech Corporation

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