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TPS61093-Q1 Datasheet(PDF) 13 Page - Texas Instruments

No. de pieza TPS61093-Q1
Descripción Electrónicos  TPS61093-Q1 Low Input Boost Converter With Integrated Power Diode and Input/Output Isolation
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61093-Q1 Datasheet(HTML) 13 Page - Texas Instruments

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background image
out
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ripple
D
I
C
=
Fs
V
´
´
L
L_peak
L_DC
L_DC
L
SW
I
I
= I
+
2
Vout
Iout
I
=
Vin
1
I =
1
1
L
+
Vout + 0.8 V
VIN
VIN
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TPS61093-Q1
www.ti.com
SLVSCO6 – JANUARY 2015
9.2.1.2.5
Inductor Selection
Because the selection of the inductor affects steady state operation, transient behavior, and loop stability, the
inductor is the most important component in power regulator design. There are three important inductor
specifications, inductor value, saturation current, and dc resistance. Considering inductor value alone is not
enough.
The saturation current of the inductor should be higher than the peak switch current as calculated in Equation 5.
where
IL_peak = Peak switch current
IL_DC = Inductor average current
ΔIL = Inductor peak to peak current
η = Estimated converter efficiency
(5)
Normally, it is advisable to work with an inductor peak-to-peak current of less than 30% of the average inductor
current. A smaller ripple from a larger valued inductor reduces the magnetic hysteresis losses in the inductor and
EMI. But in the same way, load transient response time is increased. Also, the inductor value should not be
outside the 2.2-
μH to 10-μH range in the recommended operating conditions table. Otherwise, the internal slope
compensation and loop compensation components are unable to maintain small signal control loop stability over
the entire load range. Table 3 lists the recommended inductor for the TPS61093-Q1.
Table 3. Recommended Inductors for the TPS61093-Q1
Part Number
L (
μH)
DCR Max (m
Ω)
Saturation Current (A)
Size (L×W×H mm)
Vendor
#A915_Y-4R7M
4.7
45
1.5
5.2x5.2x3.0
Toko
#A915_Y-100M
10
90
1.09
5.2x5.2x3.0
Toko
VLS4012-4R7M
4.7
132
1.1
4.0x4.0x1.2
TDK
VLS4012-100M
10
240
0.82
4.0x4.0x1.2
TDK
CDRH3D23/HP
10
198
1.02
4.0x4.0x2.5
Sumida
LPS5030-103ML
10
127
1.4
5.0x5.0x3.0
Coilcraft
9.2.1.2.6
Input And Output Capacitor Selection
The output capacitor is mainly selected to meet the requirements for output ripple and loop stability. This ripple
voltage is related to the capacitor’s capacitance and its equivalent series resistance (ESR). Assuming a ceramic
capacitor with zero ESR, the minimum capacitance needed for a given ripple can be calculated by:
where
Vripple = peak to peak output ripple
(6)
The ESR impact on the output ripple must be considered if tantalum or electrolytic capacitors are used.
Care must be taken when evaluating a ceramic capacitor’s derating under dc bias, aging, and ac signal. For
example, larger form factor capacitors (in 1206 size) have their self resonant frequencies in the range of the
switching frequency. So the effective capacitance is significantly lower. The dc bias can also significantly reduce
capacitance. A ceramic capacitor can lose as much as 50% of its capacitance at its rated voltage. Therefore,
always leave margin on the voltage rating to ensure adequate capacitance at the required output voltage.
Copyright © 2015, Texas Instruments Incorporated
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