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TPS61151DRCR Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS61151DRCR
Description  Dual-Output Boost WLED Driver Using Single Inductor
Download  26 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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ISET
Q1
R1
RISET
ON/OFF
Logic
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IN
LIM
OUT_MAX
IOUT
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TPS61150, TPS61151
www.ti.com
SLVS625E – FEBRUARY 2006 – REVISED NOVEMBER 2015
9.2.2 Detailed Design Procedure
9.2.2.1 Maximum Output Current
The overcurrent limit in a boost converter limits the maximum input current (and thus the maximum input power)
for a given input voltage. Maximum output power is less than the maximum input power because of power
conversion losses. Therefore, the current limit, input voltage, output voltage, and efficiency can all change
maximum current output. Because current limit clamps peak inductor current, ripple must be subtracted to derive
the maximum DC current. The ripple current is a function of switching frequency, inductor value, and duty cycle.
Equation 2 and Equation 3 take all of the above factors into account for maximum output current calculation.
Where:
IP = inductor peak to peak ripple
L = inductor value
VF = power diode forward voltage
FS = switching frequency
VIOUT = boost output voltage. It is equal to 330 mV + voltage drop across WLED.
(2)
Where:
IOUT_MAX = maximum output current of the boost converter
ILIM = overcurrent limit
η = efficiency
(3)
To keep a tight range on the overcurrent limit, the TPS6115x uses the VIN and IOUT pin voltages to compensate
for the overcurrent limit variation caused by the slope compensation. However, the current threshold still has a
residual dependency on the VIN and IOUT voltages. Use Figure 1 and Figure 2 to identify the typical overcurrent
limit in a specific application, and use a ±25% tolerance to account for temperature dependency and process
variations.
The maximum output current can also be limited by the current capability of the current-sink circuitry. It is
designed to provide a maximum 35-mA current regardless of the current capability of the boost converter.
9.2.2.2 WLED Brightness Dimming
There are three ways to change the output current on the fly for WLED dimming. The first method parallels an
additional resistor with the ISET pin resistor as shown in Figure 9. The switch (Q1) can change the ISET pin
resistance, and therefore modify the output current. This method is very simple, but can provide only limited
dimming steps.
Figure 9. Switching In or Out With an Additional Resistor to Change Output Current
Copyright © 2006–2015, Texas Instruments Incorporated
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