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參數資料
| 型號： | TPS65167RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件頁數： | 13/41頁 |
| 文件大小： | 1270K |
| 代理商： | TPS65167RHAT |
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Inductor Selection (Boost Converter)
Output Capacitor Selection (Boost Converter)
Rectifier Diode Selection (Boost Converter)
(
)
avg
Vin
I
= 1 - D x Isw =
x 3.5 A
Vout
with Isw=minimum switch current of the TPS65167 (3.5 A)
P
D + Iavg
V
F + Isw
(1 * D)
V
F + Isw +
Vin
Vout
V
F with Isw = minimum switch current of 3.5 A
SLVS760C – APRIL 2007 – REVISED MARCH 2008
The peak switch current is the steady state peak switch current the integrated switch, inductor and external
Schottky diode has to be able to handle. The calculation must be done for the minimum input voltage where the
peak switch current is highest. Note that the maximum output power of the device is limited by the power
dissipation of the package.
The TPS65167 typically operates with a 10-
H inductor. Main parameter for the inductor selection is the
saturation current of the inductor which should be higher than the peak switch current as calculated above 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 minimum switch current limit of 3.5 A. The second
important parameter is the inductor dc resistance. The lower the dc resistance the higher the efficiency of the
converter. The converter efficiency can vary between 2% to 10% when choosing different inductors. Possible
inductors are shown in Table 4.
Table 4. Inductor Selection Boost Converter
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS in mm
Isat/DCR
10
H
Sumida CDRH8D43-100
8.3
× 8.3 × 4.5
4 A/29 m
10
H
Wuerth 744066100
10
× 10 × 3.8
4 A/25 m
10
H
Coilcraft DO3316P-103
12.95
× 9.4 × 5.5
3.9 A/38 m
For best output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low
ESR value and work best with the TPS65167. Three 22-
F or six 10-F ceramic output capacitors in parallel are
sufficient for most applications. More capacitors can be added to improve the load transient regulation. See
Table 5 for the selection of the output capacitor.
Table 5. Output Capacitor Selection
CAPACITOR
COMPONENT SUPPLIER
COMMENTS
6
× 10 F/25 V
Taiyo Yuden TMK316BJ106KL
3
× 22 F/25 V
TDK C4532X7R1E226M
Alternative solution
To achieve high efficiency, a Schottky diode should be used. The reverse voltage rating should be higher than
the maximum output voltage of the converter. The current rating for the Schottky diode is calculated as the off
time of the converter times the peak switch current of the application. The minimum switch current of the
converter can be used as a worst case calculation.
Usually a Schottky diode with 2 A maximum average rectified forward current rating is sufficient for most of the
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.
(worst case calculation)
Table 6. Rectifier Diode Selection (Boost Converter)
Avg.
Or
Vforward
RθJA
SIZE
COMPONENT SUPPLIER
3 A
20 V
0.36 at 3 A
46
°C/W
S.C.
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 at 2 A
75
°C/W
SMB
SS22, Fairchild Semiconductor
20
Copyright 2007–2008, Texas Instruments Incorporated
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