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TPS61043DRB Datasheet(PDF) 4 Page - Texas Instruments

Part # TPS61043DRB
Description  CONSTANT CURRENT LED DRIVER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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TPS61043DRB Datasheet(HTML) 4 Page - Texas Instruments

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UVLO
Bias
+
-
-
+
CTRL
EN
VREF
0.252 V
Thermal
Shutdown
Control
Logic
EN
Gate
Driver
VIN
OVP
SW
R1
1080 kW
R2
25 kW
Current
Limit
Softstart
4.5 ms 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
TPS61043
SLVS465A – DECEMBER 2003 – REVISED DECEMBER 2003
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
CTRL
5
I
Combined enable and PWM control pin. If CTRL is constantly pulled high, the device is enabled and the internal
LED switch (Q2) is constantly turned on. When CTRL is pulled to GND, the device is disabled. Apply a PWM
signal (100 Hz to 50 kHz) to this pin to control the brightness of the LEDs
FB
4
I
Feedback. FB regulates the LED current through the sense resistor by regulating the voltage across RS to 252
mV.
GND
6
GND
LED
1
I
Input of the LED switch (Q2). Connect the LEDs to this pin.
OVP
7
I
Overvoltage protection. OVP is connected to the output capacitor of the converter.
RS
2
O
Output of the internal LED switch. The sense resistor that programs the LED current is connected to RS.
SW
8
I
Drain of the integrated switch (Q1)
VIN
3
I
Input supply pin.
FUNCTIONAL BLOCK DIAGRAM
4


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