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| 型號： | TPS65162RGZR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC48 |
| 封裝： | 7 X 7 MM, PLASTIC, VQFN-48 |
| 文件頁數(shù)： | 11/36頁 |
| 文件大小： | 1034K |
| 代理商： | TPS65162RGZR |
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Boost Converter Design Procedure
D + 1 *
Vin
h
Vout
Iout + Isw *
Vin
D
2
s
L
(1 * D)
I
swpeak +
Vin
D
2
s
L
)
Iout
1 * D
www.ti.com ............................................................................................................................................................... SLVS771B – MAY 2007 – REVISED JUNE 2008
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., 80%. With the efficiency number it is possible to
calculate the steady-state values of the application.
1. Converter Duty Cycle:
2. Maximum output current:
3. Peak switch current:
With Isw = converter switch current (minimum switch current limit = 2.8 A)
s = converter switching frequency (typical 500kHz or 750 kHz)
L = Selected inductor value
η = Estimated converter efficiency (use the number from the efficiency curves or 0.8 as an estimation)
The peak switch current is the steady-state peak switch current that the integrated switch, inductor and external
Schottky diode must be able to handle. The calculation must be done for the minimum input voltage where the
peak switch current is highest.
Inductor Selection
The TPS65162 typically operates with a 10-
H inductor. The main parameter for inductor selection is the inductor
saturation current, which should be higher than the peak switch current, as calculated above, with additional
margin to handle heavy load transients. An alternative more conservative approach is to choose an inductor with
a saturation current at least as high as the typical switch current limit of 3.6 A. The second important parameter
is the inductor DC resistance. Usually, the lower the DC resistance, the higher the efficiency of the converter.
The choice of inductor can affect converter efficiency by as much as 10%. Example inductors are shown in
Table 2. Inductor Selection (Boost Converter)
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS in mm
Isat/DCR
10
H
Coilcraft DO3316P-103
12.95 × 9.4 × 5.51
3.9 A / 38 m
10
H
Sumida CDRH8D43-100
8.3 × 8.3 × 4.5
4.0 A / 29 m
10
H
Wuerth Elektronik 744066100
10 × 10 × 3.8
4.0 A / 25 m
Output Capacitor
For best output-voltage filtering, a low-ESR output capacitor is recommended. Ceramic capacitors have a low
ESR value and work best with the TPS65162. One 10-
F ceramic output capacitor before the input-to-output
isolation switch, SWI, and six 10-
F or three 22-F ceramic output capacitors in parallel after the input-to-output
isolation switch, SWO, are sufficient for most applications. To improve the load transient regulation, add more
capacitors after the input-to-output isolation switch. Refer to Table 3 for the selection of the output capacitor.
Table 3. Output Capacitor Selection
CAPACITOR
COMPONENT SUPPLIER
COMMENTS
10
F/25 V
Taiyo Yuden TMK316BJ106KL
22
F/25 V
TDK C4532X7R1E226M
Alternative solution
Copyright 2007–2008, Texas Instruments Incorporated
19
Product Folder Link(s): TPS65162
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