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Número de pieza | SC5010 | |
Descripción | High Efficiency 8-Channel LED Driver | |
Fabricantes | Semtech | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de SC5010 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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SC5010
POWER MANAGEMENT
High Efficiency 8-Channel LED Driver with
I2C Interface and Phase-Shifted PWM Dimming
Features
Description
VIN Range — 4.5V to 27V, VOUT Range — Up to 50V
Step-up (Boost) Controller
Excellent Transient Response
Programmable Switching Frequency
Linear Current Sinks
8 Strings, up to 30mA/String
Current Matching ±1%
Current Accuracy ±1.5%
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 Signal
5-bit Analog Dimming
Optional External p-MOSFET Disconnect Switch
True Load Disconnect and Inrush Current Limiting
I2C Interface
Fault Status — Open/Short LED, UVLO, OTP
Device Control — SYNC Freq, PLL Setting
Protection Features
Open/Shorted LED(s) and adjustable OVP
Over-Temperature and UVLO Shutdown Protection
4 X 4(mm) 28-pin QFN Package
The SC5010 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 ±1.5%. An external resistor adjusts the current
from 10-30mA per string. It also features PWM dimming
resolution 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
Notebook PCs, UMPC, LCD Monitors, and Tablet PCs
SC5010 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 ptional)
VCC = 4.5 to 5.5V
R1
R2
C1
FLT
EN
For I2C
SYNC
PWMI
R3
C3
R6 R5
R10
R11
C4 R7
L1
2.2μH
DRVP
V IN
DRVN
CS
SC5010
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
Q 1 4.7μF
C5
R4
R8
R9
Up to
30m A/CH
Revision 1.0
© 2011 Semtech Corporation
1
Datasheet pdf - http://www.DataSheet4U.net/
1 page www.DataSheet.co.kr
SC5010
Electrical Characteristics (continued)
Parameter
Current Sink (IO1 to IO8)
IOx Dimming Minimum Pulse Width
ISET pin voltage
Regulation Voltage
Current Sink Disable Threshold
Current Sink Rise/Fall Time (1)
LED Current Accuracy
LED Current Matching (2)
I Off Leakage Current
On
IO Switching Frequency
Phase Delay Time between IO Pins
(IO1 to IO8)
PWM Output Resolution
Symbol
T
PWM(MIN)
V
ISET
V
IOn(REG)
V
IOn(DIS)
t
RISE/FALL
I
On(ACC%)
I
On(MATCH)
I
On(LEAK)
F
PWM(IO)
t
PD
Fault Protection
LED Short Circuit Protection Threshold
LED Open Circuit Protection Threshold
LED Short Circuit Fault Delay
FLT Pin Leakage Current
FLT Output Low
Over-Temperature Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
V
IOn(SCP)
V
IO_OCP
t
SCP(DELAY)
I
FLT(LEAK)
V
FLT(LOW)
Conditions
F = 100Hz - 30kHz
PWM(LED)
Voltage of Regulating String
Checked at Power-up
Rising
edge
from
10%
to
90%
of
I
O(n)
PWMI = 100%, T = +25°C
A
PWMI = 100%, T = +25 °C
A
PWMI = 100%, T = -40 °C to +85 °C
A
PWMI = 0V, EN = 0V, V ~ V = 25V
IO1 IO8
FAST_FREQ = 0
FAST_FREQ = 1 (Default Setting)
FAST_FREQ = 1 (default setting)
t = (1/8)*(1/F ), 8 Strings On
PD PWM(IO)
FPWM(IO) = 10kHz
F = 20kHz
PWM(IO)
R and R (3)
45
V set to 1.5V, FLT goes low
OVP
V = 0V, V = 5.0V
EN FLT
-5mA from FLT to V
CC
Min Typ Max Units
300 ns
1.23 V
0.6 V
0.6 V
25 ns
19.7 20 20.3 mA
±1 %
±2 %
0.1 1
μA
10
kHz
20
6.25 μs
10
bits
9
17xV 20xV 23xV
SCP SCP
SCP
0.2
1
-1 1
0.3
V
V
μs
μA
V
150 °C
10 °C
5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page www.DataSheet.co.kr
Typical Characteristics (continued)
Synchronization of the LED Dimming to An
External HSYNC Input
HSYNC = 48kHz
VHSYNC
5V/div.
V
LX
20V/div.
V
IO1
5V/div.
V
IO2
5V/div.
Time (10μs/div)
VIN Start Up
Output = 8P10S, 25mA/string
V
IN
5V/div.
V
LX
20V/div.
V
OUT
20V/div.
I (total)
O_LED
100mA/div.
Time (20ms/div)
SC5010
Delay Between HSYNC Rising Edge and Turn-
on of LED String 1
V
HSYNC
5V/div.
VIO1
5V/div.
Time (400ns/div)
LED String Current Accuracy vs. Temperature
20mA/string (nominal)
21.00
20.75
20.50
20.25
20.00
19.75
19.50
-40
-20
0 20 40
60
Temperature (°C)
80 100
11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet SC5010.PDF ] |
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