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LM3533 bảng dữ liệu(HTML) 49 Page - Texas Instruments

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LM3533
www.ti.com
SNOSC68C – APRIL 2012 – REVISED SEPTEMBER 2015
8.2.3 Application Curves
VIN = 3.6 V, LEDs are WLEDs part number SML-312WBCW(A), typical application circuit with L = TDK (VLF302512, 4.7 µH,
10 µH, 22 µH where specified), Schottky = On-Semi (NSR0240V2T1G), TA = 25°C, unless otherwise specified. Efficiency is
given as VOUT × (IHVLED1 + IHVLED2)/(VIN × IIN); matching curves are given as (ΔILED_MAX/ILED_AVE).
L = 22 µH
20 mA/String
ƒSW = 500 kHz
L = 22 µH
20 mA/String
ƒSW = 1 MHz
Top To Bottom: 2×4, 2×5, 2×6, 2×7, 2×8, 2×9 (LEDs)
Top To Bottom: 2×4, 2×5, 2×6, 2×7, 2×8, 2×9, 2×10 (LEDs)
Figure 38. Efficiency vs VIN, Dual String
Figure 39. Efficiency vs VIN, Dual String
L = 22 µH
20 mA/String
ƒSW = 500 kHz
L = 22 µH
20 mA/String
ƒSW = 1 MHz
Top To Bottom: 1×4, 1×5, 1×6, 1×7, 1×8, 1×9, 1×10 (LEDs)
Top To Bottom: 1×4, 1×5, 1×6, 1×7, 1×8, 1×9, 1×10 (LEDs)
Figure 40. Efficiency vs VIN, Single String
Figure 41. Efficiency vs VIN, Single String
L = 10 µH
20 mA/String
ƒSW = 500 kHz
L = 10 µH
20 mA/String
ƒSW = 1 MHz
Top To Bottom: 2×4, 2×5, 2×6, 2×7, 2×8, 2×9 (LEDs)
Top To Bottom: 2×4, 2×5, 2×6, 2×7, 2×8, 2×9, 2×10 (LEDs)
Figure 42. Efficiency vs VIN, Dual String
Figure 43. Efficiency vs VIN, Dual String
Copyright © 2012–2015, Texas Instruments Incorporated
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