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TPS92641PWPT Datasheet(PDF) 25 Page - Texas Instruments

No. de Pieza. TPS92641PWPT
Descripción  Synchronous Buck Controllers for Precision Dimming LED Drivers
Descarga  37 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS92641PWPT Datasheet(HTML) 25 Page - Texas Instruments

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VOUT = n × VLED + 200mV = 10 × 3.25V + 200mV = 32.7V
VIN
RON
UDIM
VOUT
VREF
IADJ
COMP
HG
SW
BOOT
VCC
LG
CS
GND
DAP
TPS92640
PWM
VIN
CIN1
CIN2
RUDIM1
RUDIM2
RUDIM3
CON
RON
RVOUT2
CVREF
RIADJ1
RIADJ2
CCOMP
RHG
RLG
CBOOT
DBOOT
RF
CVCC
RCS
L
QHS
QLS
COUT
RVOUT1
TPS92640, TPS92641
www.ti.com
SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015
Typical Applications (continued)
8.2.2 TPS92640 – PWM Dimming Application
Figure 24. PWM Dimming Using UDIM Pin Schematic
8.2.2.1 Design Requirements
VIN = 48 V ± 10%
VLED = 3.25 V, 325-mΩ dynamic resistance
10 LEDs in Series, rD = 3.25 Ω
ILED = 1 A
fSW = 500 kHz
VCS = 200 mV
ΔiLED-PP ≤ 300 mA
ΔVIN-PP ≤ 1.5 V
VTURN-ON = 40 V
VHYS = 15 V
8.2.2.2 Detailed Design Procedure
8.2.2.2.1
Calculate Operating Points
Calculate the operating points using Equation 28 to Equation 30, and assume approximately 90% conversion
efficiency (
η = 0.9).
(28)
Copyright © 2012–2015, Texas Instruments Incorporated
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Product Folder Links: TPS92640 TPS92641


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