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TPD12S015 Datasheet(PDF) 16 Page - Texas Instruments

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Part No. TPD12S015
Description  HDMI COMPANION CHIP WITH STEP-UP DC-DC, I2C LEVEL SHIFTER, AND HIGH-SPEED ESD CLAMPS FOR PORTABLE APPLICATIONS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPD12S015 Datasheet(HTML) 16 Page - Texas Instruments

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2
1
IN
OUT
L peak
V
D
I
I
f
L
D
h
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´
-
´
OUT
IN
OUT
V
V
D
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TPD12S015
SLLSE19A – DECEMBER 2009 – REVISED JANUARY 2010
www.ti.com
Parameter f is the switching frequency and
ΔIL is the ripple current in the inductor, i.e., 20% x IL. With this
calculated value and the calculated currents, it is possible to choose a suitable inductor. In typical applications a
1.0 mH inductance is recommended. The device has been optimized to operate with inductance values between
1.0 mH and 1.3 mH. It is recommended that an inductance value of at least 1.0 mH is used, even if Equation 2
yields something lower. Care has to be taken that load transients and losses in the circuit can lead to higher
currents as estimated in Equation 3. Also, the losses in the inductor caused by magnetic hysteresis losses and
copper losses are a major parameter for total circuit efficiency.
With the chosen inductance value, the peak current for the inductor in steady state operation can be calculated.
Equation 3 shows how to calculate the peak current I.
(3)
where
This would be the critical value for the current rating for selecting the inductor. It also needs to be taken into
account that load transients and error conditions may cause higher inductor currents.
Input Capacitor
Because of the nature of the boost converter having a pulsating input current, a low ESR input capacitor is
required to prevent large voltage transients that can cause misbehavior of the device or interferences with other
circuits in the system. At least 1.2 uF input capacitor is recommended to improve transient behavior of the
regulator and EMI behavior of the total power supply circuit. It is recommended to place a ceramic capacitor as
close as possible to the VIN and GND pins and better to use a 4.7 uF capacitor, in order to improve the input
noise filtering.
Output Capacitor
For the output capacitor, it is recommended to use small ceramic capacitors placed as close as possible to the
VOUT and GND pins of the IC. If, for any reason, the application requires the use of large capacitors which can
not be placed close to the IC, using a smaller ceramic capacitor in parallel to the large one is recommended.
This small capacitor should be placed as close as possible to the VOUT and GND pins of the IC. To get an
estimate of the recommended minimum output capacitance, Equation 4 can be used.
(4)
Parameter f is the switching frequency and
ΔV is the maximum allowed ripple. With a chosen ripple voltage of 10
mV, a minimum effective capacitance of 2.7 mF is needed. The total ripple is larger due to the ESR of the output
capacitor. This additional component of the ripple can be calculated using
ΔVESR = IOUT x RESR
A capacitor with a value in the range of the calculated minimum should be used. This is required to maintain
control loop stability. There are no additional requirements regarding minimum ESR. There is no upper limit for
the output capacitance value. Larger capacitors cause lower output voltage ripple as well as lower output voltage
drop during load transients.
Note that ceramic capacitors have a DC Bias effect, which will have a strong influence on the final effective
capacitance needed. Therefore the right capacitor value has to be chosen very carefully. Package size and
voltage rating in combination with material are responsible for differences between the rated capacitor value and
the effective capacitance. The minimum effective capacitance value should be 1.2 uF but preferred value is
about 4.7 uF
16
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Product Folder Link(s): TPD12S015


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