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參數(shù)資料
| 型號(hào)： | TPS65161PWPRG4 |
| 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, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數(shù)： | 10/34頁 |
| 文件大小： | 847K |
| 代理商： | TPS65161PWPRG4 |
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D + 1 *
Vin
h
Vout
Iavg + (1 * D)
lsw +
Vin
Vout
2.8 A with lsw + minimum switch current of the TPS65161 (2.8 A).
I
swpeak +
Vin
D
2
s
L
)
Iout
1 * D
SLVS617D – APRIL 2006 – REVISED SEPTEMBER 2009 ............................................................................................................................................... www.ti.com
Table 1. Input Capacitor Selection
CAPACITOR
VOLTAGE RATING
COMPONENT SUPPLIER
COMMENTS
22
μF/1210
16 V
Taiyo Yuden EMK325BY226MM
CIN (VINB)
1
μF/1206
16 V
Taiyo Yuden EMK316BJ106KL
CIN (AVIN)
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. A simple approach is to use 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%.
1. Duty Cycle:
2. Maximum output current:
3. Peak switch current:
With
Isw = converter switch current (minimum switch current limit = 2.8 A)
fs = converter switching frequency (typical 500 kHz/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 (Boost Converter)
The TPS65161 operates typically with a 10-
μH inductor. Other possible inductor values are 6.8-μH or 22-μH. The
main parameter for the inductor selection is the saturation current of the inductor, which should be higher than
the peak switch current as previously calculated, with additional margin to cover for heavy load transients. The
alternative, more conservative approach, is to choose the inductor with saturation current at least as high as the
typical switch current limit of 3.5 A. The second important parameter is the inductor dc resistance. Usually, the
lower the dc resistance the higher the efficiency. The efficiency difference between different inductors can vary
between 2% to 10%. Possible inductors are shown in Table 2.
Table 2. Inductor Selection (Boost Converter)
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS in mm
Isat/DCR
22
μH
Coilcraft MSS1038-103NX
10,2 × 10,2 × 3,6
2.9 A/73 m
22
μH
Coilcraft DO3316-103
12,85 × 9,4 × 5,21
3.8 A/38 m
10
μH
Sumida CDRH8D43-100
8,3 × 8,3 × 4,5
4.0 A/29 m
10
μH
Sumida CDH74-100
7,3 × 8,0 × 5,2
2.75 A/43 m
10
μH
Coilcraft MSS1038-103NX
10,2 × 10,2 × 3,6
4.4 A/35 m
6.8
μH
Wuerth Elektronik 7447789006
7,3 × 7,3 × 3,2
2.5 A/44 m
Output Capacitor Selection (Boost Converter)
For best output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low
ESR value and work best with the TPS65161. Usually, three 22-
μF ceramic output capacitors in parallel are
sufficient for most applications. If a lower voltage drop during load transients is required, more output
capacitance can be added. See Table 3 for the selection of the output capacitor.
18
Copyright 2006–2009, Texas Instruments Incorporated
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