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LP8862-Q1 Datasheet(PDF) 25 Page - Texas Instruments

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Part # LP8862-Q1
Description  High-Performance 2-Channel LED Driver
Download  37 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8862-Q1 Datasheet(HTML) 25 Page - Texas Instruments

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LP8862-Q1
FB
PWM
OUT1
L1
D1
4.5...30 V
COUT
SD
VSENSE_N
RISET
Up to 160 mA/string
SW
LDO
FSET
VIN
VDDIO/EN
PGND
GND
PAD
VIN
RISENSE
ISET
FAULT
VDDIO
FAULT
EN
RFSET
Q1
R1
R2
RGS
R3
BRIGHTNESS
BOOST SYNC
SYNC
C1
CLDO
Up to 15 V
CIN SEPIC
CIN
OUT2
LP8862-Q1
www.ti.com
SNVSA75A – NOVEMBER 2015 – REVISED NOVEMBER 2015
8.2.2 SEPIC Mode Application
When LED string voltage can be above or below VIN voltage, SEPIC configuration can be used. In Figure 24 an
external frequency is used to synchronize SEPIC switching frequency. External frequency can be modulated to
spread switching frequency spectrum.
Figure 24. SEPIC Mode, 2 Strings, 160-mA String Configuration
Typical design parameters for a SEPIC-mode two-string configuration are shown in Table 6:
Table 6. SEPIC Mode Design Parameters
DESIGN PARAMETER
VALUE
VIN voltage range
4.5…30 V
LED string
2 × 2 LEDs (9 V)
LED string current
160 mA
Max output voltage
15 V
SEPIC switching frequency
300 kHz
External boost sync
used
Internal spread spectrum not available, external frequency input can
Spread spectrum
be modulated
L1
22
μH
CIN
10 µF, 50 V
CIN SEPIC
2 × (10-µF 50-V ceramic) + 33-µF 50-V electrolytic
COUT
2 × (10-µF 50-V ceramic) + 33-µF 50-V electrolytic
CLDO
1 µF, 10 V
RISET
30 k
Ω
RFSET
210 k
Ω
RISENSE
50 m
Ω
R1
300 k
Ω
R2
130 k
Ω
R3
10 k
Ω
RGS
20 k
Ω
Copyright © 2015, Texas Instruments Incorporated
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