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TPS61160A Datasheet(PDF) 10 Page - Texas Instruments

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Part # TPS61160A
Description  White LED Driver With PWM Brightness Control in 2mm x 2mm QFN Package for up to 10 LEDs in Series
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS61160A Datasheet(HTML) 10 Page - Texas Instruments

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APPLICATION INFORMATION
MAXIMUM OUTPUT CURRENT
ú
û
ù
ê
ë
é
+
-
+
´
´
=
)
V
1
V
V
V
1
(
F
L
1
I
in
in
f
out
s
P
(3)
Iout_max
+
Vin
I
lim * IP 2
h
Vout
(4)
INDUCTOR SELECTION
I
in_DC +
Vout
Iout
Vin
h
(5)
TPS61160A
TPS61161A
SLVS937 – MARCH 2009................................................................................................................................................................................................... www.ti.com
The overcurrent limit in a boost converter limits the maximum input current and thus maximum input power for a
given input voltage. Maximum output power is less than maximum input power due to power conversion losses.
Therefore, the current limit setting, input voltage, output voltage and efficiency can all change maximum current
output. The current limit clamps the peak inductor current; therefore, the ripple has to be subtracted to derive
maximum DC current. The ripple current is a function of switching frequency, inductor value and duty cycle. The
following equations take into account of all the above factors for maximum output current calculation.
Where:
Ip = inductor peak to peak ripple
L = inductor value
Vf = Schottky diode forward voltage
Fs = switching frequency
Vout = output voltage of the boost converter. It is equal to the sum of VFB and the voltage drop across LEDs.
Where:
Iout_max = maximum output current of the boost converter
Ilim = over current limit
η = efficiency
For instance, when VIN is 3.0V, 8 LEDs output equivalent to VOUT of 26V, the inductor is 22
µH, the Schottky
forward voltage is 0.2V; and then the maximum output current is 65mA in typical condition. When VIN is 5V, 10
LEDs output equivalent to VOUT of 32V, the inductor is 22
µH, the Schottky forward voltage is 0.2V; and then the
maximum output current is 85mA in typical condition.
The selection of the inductor affects steady state operation as well as transient behavior and loop stability. These
factors make it the most important component in power regulator design. There are three important inductor
specifications, inductor value, DC resistance and saturation current. Considering inductor value alone is not
enough.
The inductor value determines the inductor ripple current. Choose an inductor that can handle the necessary
peak current without saturating, according to half of the peak-to-peak ripple current given by Equation 3, pause
the inductor DC current given by:
Inductor values can have ±20% tolerance with no current bias. When the inductor current approaches saturation
level, its inductance can decrease 20% to 35% from the 0A value depending on how the inductor vendor defines
saturation current. Using an inductor with a smaller inductance value forces discontinuous PWM when the
inductor current ramps down to zero before the end of each switching cycle. This reduces the boost converter’s
maximum output current, causes large input voltage ripple and reduces efficiency. Large inductance value
provides much more output current and higher conversion efficiency. For these reasons, a 10
µH to 22µH
inductor value range is recommended. A 22
µH inductor optimized the efficiency for most application while
maintaining low inductor peak to peak ripple. Table 1 lists the recommended inductor for the TPS61160A/61A.
When recommending inductor value, the factory has considered –40% and +20% tolerance from its nominal
value.
10
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): TPS61160A TPS61161A


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