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| 型號： | TPS65171RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件頁數(shù)： | 14/46頁 |
| 文件大?。?/td> | 3644K |
| 代理商： | TPS65171RHAR |
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in
out
in
out
swpeak
out
in
swpeak
V
1. Converter Duty Cycle:
D = 1
V
D
2. Maximum output current: I
= I
(1 D)
2fs
L
I
V
D
3. Peak switch current:
I
=
+
2fs
L
1 D
h
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-
÷
è
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www.ti.com
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
Overvoltage Protection
The boost converter has two overvoltage protection mechanisms for the switch. Vs is monitored with an
overvoltage protection comparator on the OS pin and as soon as 19.5V typical is reached, the boost converter
stops switching. The converter also detects overvoltage if the feedback voltage at the feedback pin FB1 is 3%
above the typical regulation voltage of 1.24V, which stops switching. The converter starts switching again if the
output voltage falls below the overvoltage thresholds.
Input Capacitor Selection
For good input voltage filtering, low ESR ceramic capacitors are recommended. All input voltages (AVIN, VIN1,
2, 3) are shorted internally. It is recommended to short AVIN, VIN1, and VIN2 externally on the PCB by a thick
conducting path to avoid high currents between the VIN pins inside the device and to place one 10mF input
capacitor as close as possible to these pins. Another 10mF input capacitor should be placed close to VIN3. For
better input voltage filtering the input capacitor values can be increased. If it is not possible to place the 10mF
capacitor close to the device, it is recommended to add an additional 1mF or 4.7mF capacitor which should be
placed next to the input pins. To reduce power losses at the external isolation switch, a filter capacitor C3 at the
input terminal of the inductor is required. To minimize possible audible noise problems, one 10mF capacitor in
parallel is recommended. More capacitance further reduces the ripple current across the isolation switch. See
Table 2 for input capacitor selection.
Table 2. Input Capacitor Selection
CAPACITOR
COMPONENT SUPPLIER
10mF/16V
Murata, GRM31CR71C106KAC7
10mF/16V
Taiyo Yuden, EMK325BJ106MN
10mF/16V
Murata, GRM31CR61C106KA88
Boost Converter Design Procedure
The first step in the design procedure is to verify whether the maximum possible output current of the boost
converter supports the specific application requirements. To simplify the calculation, the fastest approach is to
estimate the converter efficiency by taking the efficiency numbers from the provided efficiency curves or to use a
worst case assumption for the expected efficiency, e.g., 90%. The calculation must be made with the minimum
assumed input voltage where peak switch current is the highest. The inductor and external Schottky diode has to
be able to handle this current.
(9)
With,
Iswpeak = Converter peak switch current (minimum switch current limit = 2.5 A)
fs = Converter switching frequency (typical 750 kHz)
L = Selected inductor value
h = Estimated converter efficiency (use the number from the efficiency curves or 0.9 as an assumption)
Copyright 2009–2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPS65171
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