參數(shù)資料
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)： 22/46頁
文件大?。?/td> 3644K
代理商： TPS65171RHAR
6kW
7kW
8kW
9kW
10kW
11kW
-23V
-22V
-21V
-20V
-19V
-18V
-17V
-16V
-15V
-14V
-13V
-12V
-11V
-10V
-10C
0C
10C
20C
30C
40C
50C
-23V
-22V
-21V
-20V
-19V
-18V
-17V
-16V
-15V
-14V
-13V
-12V
-11V
-10V
-10C
0C
10C
20C
30C
40C
50C
10kW
12kW
15kW
20kW
25kW
30kW
3.5kW
4kW
4.5kW
5kW
5.2kW
5.5kW
-23V
-22V
-21V
-20V
-19V
-18V
-17V
-16V
-15V
-14V
-13V
-12V
-11V
-10V
-10C
0C
10C
20C
30C
40C
50C
2.5kW
2.7kW
2.8kW
2.9kW
3kW
3.1kW
-23V
-22V
-21V
-20V
-19V
-18V
-17V
-16V
-15V
-14V
-13V
-12V
-11V
-10V
-10C
0C
10C
20C
30C
40C
50C
R18=open
R18=51kW
R18=20kW
R18=10kW
out
in
out
in
out
swpeak
out
in
swpeak
V
1. Converter Duty Cycle:
D =
V
D
2. Maximum output current: I
=
I
-
(1 D)
2fs×L
I
V
D
3. Peak switch current:
I
=
+
1 D
2fs
L
-
h -
-
÷
è
-
www.ti.com
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
Figure 30. Temperature Compensation Examples for R18 = open, 51 k
, 20 k, 10 k
Buck-Boost Converter Design Procedure
The first step in the design procedure is to verify whether the maximum possible output current of the buck-boost
converter supports the specific application requirements. To simplify the calculation, the fastest approach is to
estimate 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., 80%. The calculation must be performed for the
minimum assumed input voltage where the peak switch current is the highest. The inductor and external
Schottky diode have to be able to handle this current.
(32)
With,
Iswpeak = Converter peak switch current (minimum switch current limit = 0.8A)
fs = Converter switching frequency (typical 750 kHz)
L = Selected inductor value
h = Estimated converter efficiency (use the number from the efficiency curves or 0.8 as an assumption)
Copyright 2009–2010, Texas Instruments Incorporated
29
Product Folder Link(s): TPS65171
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