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TPS61150DRCR Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS61150DRCR
Description  Dual-Output Boost WLED Driver Using Single Inductor
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61150DRCR Fiches technique(HTML) 8 Page - Texas Instruments

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IOUT
+
0.33 V
Current
Sink
Current
Sink
ISET1
ISET2
IFB1
IFB2
SEL2
SEL1
12-MHz Current
Mode Control
PWM
VIN
GND
SW
Error
Amplifier
TPS61150/51
TPS61150, TPS61151
SLVS625E – FEBRUARY 2006 – REVISED NOVEMBER 2015
www.ti.com
8 Detailed Description
8.1 Overview
The TPS6115x is a two-channel WLED driver with an integrated inductive boost converter. The boost converter
generates the bias voltage for the LED string while the two integrated low-side current sinks independently
regulate the current in LED strings from VIN to 29 V. Independent LED string dimming is provided via a PWM
input at the SEL1 and SEL2 inputs.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Start-Up
During start-up, both the boost converter and the current sink circuitry ramp up simultaneously to establish a
steady state. The current sink circuitry ramps up current in 16 steps with each step taking 64 clock cycles. This
period ensures that the current sink loop is slower than the boost converter response during start-up. Therefore,
the boost converter output comes up slowly as current sink circuitry ramps up the current. This configuration
ensures a smooth start-up and minimizes in-rush current.
8.3.2 Overvoltage Protection (OVP)
To prevent the boost output runaway as the result of WLED disconnection, there is an overvoltage protection
circuit that stops the boost converter from switching as soon as its output exceeds the OVP threshold. When the
voltage falls below the OVP threshold, the converter resumes switching.
The two OVP options offer the choices to prevent a 25-V rated output capacitor or the internal 30-V FET from
breaking down.
8
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Product Folder Links: TPS61150 TPS61151


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