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TPS61043 Datasheet(PDF) 8 Page - Texas Instruments

Part # TPS61043
Description  Constant Current LED Driver
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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TPS61043 Datasheet(HTML) 8 Page - Texas Instruments

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background image
UVLO
Bias
+
-
-
+
CTRL
EN
VREF
0.252 V
Thermal
Shutdown
Control
Logic
EN
Gate
Driver
VIN
OVP
SW
R1
1080 k
R2
25 k
Current
Limit
Softstart
4.5 µs Max
On Time
Overvoltage Protection
0.4 V
Enable
Control
Logic
EN
PWM
Gate
Drive
GND
FB
Error
Comparator
VREF
400 ns Min
Off Time
Q1
Q2
LED
RS
8
TPS61043
SLVS465C – DECEMBER 2003 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: TPS61043
Submit Documentation Feedback
Copyright © 2003–2016, Texas Instruments Incorporated
8 Detailed Description
8.1 Overview
The TPS61043 operates like a standard boost converter but regulates the voltage across the sense resistor (RS)
instead of the output voltage. This gives an accurate regulated LED current independent of the input voltage and
number of LEDs connected. With integrated overvoltage protection (OVP) the TPS61043 is configured as a
current source with overvoltage protection ideally suited to drive LEDs. The device can generate output voltages
of up to 18 V and has an internal 400mA MOSFET switch (Q1). This allows several LEDs to be connected in
series to the output. The internal LED switch (Q2) in series with the LEDs has a maximum current rating of 60
mA and disconnects the LEDs from ground during shutdown. The LED switch is driven by a PWM signal applied
to the control pin (CTRL), which directly controls the LED brightness. With this control method the LED
brightness depends on the PWM duty cycle only and is independent of the PWM frequency and amplitude.
8.2 Functional Block Diagram


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