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TPS61193PWPR Datasheet(PDF) 24 Page - Texas Instruments

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Part # TPS61193PWPR
Description  High-Performance 3-Channel LED Driver
Download  33 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61193PWPR Datasheet(HTML) 24 Page - Texas Instruments

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TPS61193
SNVSAF4 – OCTOBER 2015
www.ti.com
8.2.2.1 Design Requirements
DESIGN PARAMETER
VALUE
VIN voltage range
4.5…30 V
LED string
3P2S LEDs (7.2 V)
LED string current
100 mA
Maxmum output voltage
10 V
SEPIC switching frequency
2.2 MHz
External sync for SEPIC
used
Spread spectrum
Internal spread spectrum disabled (external sync used)
L1, L2
10 µH
CIN
10 µF 50 V
CIN SEPIC
2 × (10 µF 50-V ceramic) + 33 µF 50-V electrolytic
C1
10 µF 50V ceramic
COUT
2 × (10 µF 50-V ceramic) + 33 µF 50-V electrolytic
CLDO
1 µF 10-V
RISET
24 k
Ω
RFSET
24 k
Ω
R1
184 k
Ω
R2
130 k
Ω
R3
10 k
Ω
8.2.2.2 Detailed Design Procedure
In SEPIC mode the maximum voltage at the SW pin is equal to the sum of the input voltage and the output
voltage. Because of this, the maximum sum of input and output voltage must be limited below 50 V. See Detailed
Design Procedure for general external component guidelines. Main differences of SEPIC compared to boost are
described below.
Power Stage Designer™ Tool can be used for modeling SEPIC behavior: http://www.ti.com/tool/powerstage-
designer. For detailed explanation on SEPIC see Texas Instruments Analog Applications Journal Designing
DC/DC Converters Based on SEPIC Topology (SLYT309).
8.2.2.2.1
Inductor
In SEPIC mode, currents flowing through the coupled inductors or the two separate inductors L1 and L2 are the
input current and output current, respectively. Values can be calculated using Power Stage Designer™ Tool or
using equations in SLYT309.
8.2.2.2.2
Diode
In SEPIC mode diode peak current is equal to the sum of input and output currents. Diode rating for peak
repetitive current should be greater than SW pin current limit (up to 3 A for transients) to ensure reliable
operation in boost mode. Average current rating should be greater than the maximum output current. Diode
voltage rating must be higher than sum of input and output voltages.
8.2.2.2.3
Capacitor C1
Ceramic capacitor with low ESR is recommended. Diode voltage rating must be higher than maximum input
voltage.
24
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