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參數資料
| 型號： | TPS65161PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 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： | 14/34頁 |
| 文件大?。?/td> | 847K |
| 代理商： | TPS65161PWPRG4 |
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Vout
D =
Vin
withIsw=minimumswitchcurrentofthe TPS65161(2.5 A)
(
)
Vout
I
=
I
Vin
1 - D x
= 1 -
x 2.5 A
avg
sw
÷
è
www.ti.com ............................................................................................................................................... SLVS617D – APRIL 2006 – REVISED SEPTEMBER 2009
Rectifier Diode Selection (Step-Down Converter)
To achieve high efficiency, a Schottky diode should be used. The reverse voltage rating should be higher than
the maximum output voltage of the step-down converter. The averaged rectified forward current at which the
Schottky diode needs to be rated is calculated as the off-time of the step-down converter times the maximum
switch current of the TPS65161:
Usually, a Schottky diode with 1.5-A or 2-A maximum average rectified forward current rating is sufficient for
most applications. Secondly, the Schottky rectifier has to be able to dissipate the power. The dissipated power is
the average rectified forward current times the diode forward voltage.
PD = Iavg × VF = Isw × (1 – D) × VF with Isw = minimum switch current of the TPS65161 (2.5 A).
Table 6. Rectifier Diode Selection (Step-Down Converter)
CURRENT RATING
Vr
Vforward
RθJA
SIZE
COMPONENT SUPPLIER
Iavg
3 A
20 V
0.36 V at 3 A
46°C/W
SMC
MBRS320, International Rectifier
2 A
20 V
0.44 V at 2 A
75°C/W
SMB
SL22, Vishay Semiconductor
2 A
20 V
0.5 V at 2 A
75°C/W
SMB
SS22, Fairchild Semiconductor
1.5 A
20 V
0.445 V at 1 A
88°C/W
SMA
SL12, Vishay Semiconductor
Output Capacitor Selection (Step-Down Converter)
The device is designed to work with ceramic output capacitors. When using a 15-
μH inductor, two 22-μF ceramic
output capacitors are recommended. More capacitance can be added to improve the load transient response.
Table 7. Output Selection (Step-Down Converter)
CAPACITOR
VOLTAGE RATING
COMPONENT SUPPLIER
22
μF/0805
6.3 V
Taiyo Yuden JMK212BJ226MG
Copyright 2006–2009, Texas Instruments Incorporated
21
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