SC5010 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC5010
Semtech Corporation
'SC5010' PDF : 36 Pages View PDF
SC5010
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 input, boost converter
SYNC
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.
Vin
(5-27V)
PGND
Vcc (5V)
AGND
C1
4 . 7 μF
R2
30K
C2
2 . 2 μF
R1
10K
Q2
Si7129
C7
10nF
L1
4.7μH
Q1
Si2318
DFLS140
R9
0.1
U1 28 27 26 25 24 23 22
R11
287K
C6
4 .7 μF X 2
R10
10K
Vout
10 WLEDs per channel
R3
10K
R4, 10k
R5, 10K
C3
1 μF
R6
100k
1 VCC
2 EN
3
UVLO
4
SCP
5 BG
6
FSET
7
AGND
S C5010
IO2 21
IO3 20
IO4 19
18
IO5
IO6 17
IO7 16
15
IO8
R15
20K
8
R7, 110K
C4
100pF
C5
2.7pF
9 10 11 12 13 14
THP
PAD
R8
64.9K
SYNC SCL SDA
FLT PWMI
Figure 2 — Detailed Application Circuit
21
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