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TPS61000 Datasheet(PDF) 17 Page - Texas Instruments

Part # TPS61000
Description  Single- and Dual-Cell Boost Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS61000 Datasheet(HTML) 17 Page - Texas Instruments

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ESR
OUT
ESR
V
I
R


K
OUT
OUT
BAT
min
OUT
,
9
± 9
C
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9
9
u
u '
u
TPS61000, TPS61001, TPS61002, TPS61003
TPS61004, TPS61005, TPS61006, TPS61007
www.ti.com
SLVS279D – MARCH 2000 – REVISED AUGUST 2015
Table 3. Recommended Inductors (continued)
VENDOR
PART NUMBER
UP1B Series
Coiltronics
UP2B Series
Murata
LQH3N Series
CD43 Series
Sumida
CD54 Series
CDR74B Series
TDK
NLC453232T Series
10.2.2.4 Capacitor Selection
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero.
where
f is the switching frequency
ΔV is the maximum allowed ripple.
(5)
With a chosen ripple voltage of 15 mV, a minimum capacitance of 10 µF is needed. The total ripple will be larger
due to the ESR of the output capacitor. This additional component of the ripple can be calculated using the
following equation:
(6)
An additional ripple of 30 mV is the result of using a tantalum capacitor with a low ESR of 300 m
Ω. The total
ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor. In
this example, the total ripple is 45 mV. It is possible to improve the design by enlarging the capacitor or using
smaller capacitors in parallel to reduce the ESR or by using better capacitors with lower ESR, like ceramics. For
example, a 10-µF ceramic capacitor with an ESR of 50 m
Ω is used on the evaluation module (EVM). Tradeoffs
have to be made between performance and costs of the converter circuit.
A 10-µF input capacitor is recommended to improve transient behavior of the regulator. A ceramic capacitor or a
tantalum capacitor with a 100-nF ceramic capacitor in parallel placed close to the IC is recommended.
10.2.2.5 Rectifier Selection
The rectifier diode has a major impact on the overall converter efficiency. Standard diodes are not suitable for
low-voltage switched mode power supplies. A Schottky diode with low forward voltage and fast reverse recovery
should be used as a rectifier to minimize overall losses of the dc-dc converter. The maximum current rating of the
diode must be high enough for the application. The maximum diode current is equal to the maximum current in
the inductor that was calculated in equation 3. The maximum reverse voltage is the output voltage. The chosen
diode should therefore have a reverse voltage rating higher than the output voltage.
Table 4. Recommended Diodes
VENDOR
PART NUMBER
MBRM120LT3
Motorola Surface
Mount
MBR0520LT1
1N1517
Motorola Axial Lead
RB520S-30
ROHM
RB160L–40
Copyright © 2000–2015, Texas Instruments Incorporated
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Product Folder Links: TPS61000 TPS61001 TPS61002 TPS61003 TPS61004 TPS61005 TPS61006 TPS61007


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