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SC5010H Datasheet, PDF (1/36 Pages) Semtech Corporation – High Efficiency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming | |||
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SC5010H
POWER MANAGEMENT
High Efficiency 8-Channel LED Driver with
I2C Interface and Phase-Shifted PWM Dimming
Features
Description
ï® VIN Range â 4.5V to 27V, VOUT Range â Up to 50V
ï® Step-up (Boost) Controller
ï® Ultra-Fast Transient Response
ï® Integrated Soft-start
ï® Programmable Switching Frequency
ï® Linear Current Sinks
ï® 8 Strings, up to 50mA/String
ï® Current Matching ±1%
ï® Current Accuracy ±2%
ï® PWM Dimming
ï® String-by-String Phase Shifting
ï® Input Dimming Frequency 100Hz-30kHz
ï® User Selectable 9 or 10 Bits Dimming Resolution
ï® Optional Synchronization to VSYNC/HSYNC Signal
ï® Optional External p-MOSFET Disconnect Switch
ï® True Load Disconnect and Inrush Current Limiting
ï® I2C Interface
ï® Fault Status â Open/Short LED, UVLO, OTP
ï® Device Control â SYNC Freq, PLL Setting
ï® Protection Features
ï® Open/Shorted LED(s) and adjustable OVP
ï® Over-Temperature and UVLO Shutdown Protection
ï® 4 X 4 X 0.6 (mm) 28-pin QFN Package
The SC5010H is an 8-channel high-precision, high-efficiency
step-up (Boost) LED driver for backlight applications. It fea-
tures wide input voltage range (4.5V to 27V) , flexible output
configuration, wide analog and PWM dimming range,
phase shifting and fading. It also features video signal syn-
chronization (VSYNC), I2C interface, and numerous protec-
tion features. An optional disconnect p-MOSFET provides
true load disconnection and inrush current limiting.
The boost controller, with programmable switching fre-
quency from 200kHz to 2.2MHz, maximizes efficiency by
dynamically minimizing the output voltage while maintain-
ing LED string current accuracy. It provides excellent line
and load response with no external compensation compo-
nents. Each linear current sink is matched within ±1% for
superb lighting uniformity, and the accuracy of each string
current is ±2%. An external resistor adjusts the current from
10-50mA per string. It also features PWM dimming resolu-
tion of 9 or 10 bits (user selectable) over dimming frequency
from 100Hz to 20kHz, synchronized to the SYNC signal or
the boost oscillator. String-by-string phase shifting reduces
the demand on the input/output capacitance, decreases
EMI, and improves dimming linearity.
Applications
ï® Notebook PCs, UMPC, LCD Monitors, and Tablet PCs
SC5010H is available in a low-profile, thermally enhanced,
4 X 4 X 0.6(mm) QFN 28-pin package.
Typical Application Circuit
C2
VIN=4.5 to 27V
Q2
(O p tio n a l)
VCC = 4.5 to 5.5V
R1 C1
R2
FLT
EN
For I2C
SYNC
PWMI
R3
C3
R6 R5
R10
R11
C4
R7
L1
DRVP
V IN
DRVN
CS
SC5010H
UVLO
VCC
OVP
FLT
EN
SDA
SCL
SYNC
PWMI
BG
SCP
FSET
IS E T
CPLL
IO 1
IO 2
IO 3
IO 4
IO 5
IO 6
IO 7
IO 8
AGND
PGND
D1 VOUT up to 50V
Q1
R4
R9
C5
R8
Up to
50m A/CH
Revision 1.0
© 2011 Semtech Corporation
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