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SC5010 Datasheet(PDF) 21 Page - Semtech Corporation

Part # SC5010
Description  High Effi ciency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming
PDF  36 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC5010 Datasheet(HTML) 21 Page - Semtech Corporation

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SC5010
21
Applications Information (continued)
external p-channel MOSFET. The external p-channel
MOSFET provides load disconnection during shutdown or
fault mode. It also provides input inrush current limiting
during start-up. During shutdown, the DRVP pin is pulled
up to VIN voltage via an internal 1M
resistor. At startup,
the boost converter is held off and the DRVP pin is pulled
low via an internal 20μA (typ) current source. When the
DRVP pin is pulled lower than the threshold voltage of the
external p-channel MOSFET, the input current starts
charging up the output capacitor to the input voltage.
After that, the boost converter enters into soft start
mode.
Fault Protection
SC5010 provides fault detection for low supply voltage,
LED related faults, missing V
SYNC
input, boost converter
over-voltage and thermal shutdown. The open drain
output pin (FLT) indicates a system fault. The nature of the
fault can be read from the fault status resistor (register
address: 0x00) via I2C interface. Refer to Table 2 for a
description of the Fault Protection Modes.
Other Possible Configurations
Depending on different application requirement, the
SC5010 can also be easily configured to other topology
such as SEPIC (Single-Ended Primary-Inductor Converter)
configuration as shown in Figure 3.
Figure 2 — Detailed Application Circuit
C5
2.7pF
Vin
(5-27V)
U1
S C 5010
VCC
1
EN
2
UVLO
3
SCP
4
BG
5
FSET
6
AGND
7
8
9 10 11 12 13 14
IO8
15
IO7 16
IO6 17
IO5
18
IO4 19
IO3 20
IO2 21
22
23
24
THP
25
26
27
28
DFLS140
R4, 10k
C4
100pF
R3
C6
Q1
Si2318
Q2
Si7129
C2
SDA
R8
R15
C7
10nF
C1
SCL
C3
L1
4.7μH
R9
R1
PWMI
R10
Vcc (5V)
R6
R2
AGND
R11
SYNC
Vout
10 WLEDs per channel
PAD
FLT
2.2μF
10K
PGND
4.7μF
4.7μF X 2
1μF
30K
0.1
287K
10K
64.9K
R 7, 110K
20K
10K
R5, 10K
100k



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