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參數(shù)資料
| 型號： | TPS65167RHAT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)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(shù)： | 16/41頁 |
| 文件大小： | 1270K |
| 代理商： | TPS65167RHAT |
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Selecting the Feed-forward Capacitor (step-down converter)
1
C17 =
=
= 468 pF = 470 pF
2 x
x 170kHz x R9
2 x
x 170kHz x 2k
p
(8)
Inductor Selection (step-down converter)
DIL + Vout
1 *
Vout
Vin
L
I
Lmax + Ioutmax )
DIL
2
(9)
Rectifier Diode Selection (step-down converter)
D +
Vout
Vin
(10)
Iavg + (1 * D)
Isw + 1 *
Vout
Vin
2.8 A
with Isw = minimum switch current of the TPS65167 (2.8 A)
P
D + Iavg
V
F + Isw
(1 * D)
V
F with Isw = minimum switch current of the TPS65167 (2.8 A)
SLVS760C – APRIL 2007 – REVISED MARCH 2008
The feed-forward capacitor across the upper feedback resistor divider form a zero around 170 kHz and is
calculated as:
The capacitor value closest to the calculated value is selected.
The TPS65167 operates typically with a 10-
H inductor value. For high efficiencies, the inductor should have a
low dc resistance to minimize conduction losses. This needs to be considered when selecting the appropriate
inductor. To avoid saturation of the inductor, the inductor should be rated at least for the maximum output current
of the converter plus the inductor ripple current that will be calculated as:
With:
f = Switching Frequency (750 kHz)
L = Inductor Value (typically 10
H)
ΔIL= Peak to Peak inductor ripple current
ILax = Maximum Inductor current
The highest inductor current occurs at maximum Vin. A more conservative approach is to select the inductor
current rating just for the minimum switch current limit of 2.8 A.
Table 8. Inductor Selection (Step down converter)
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS in mm
Sat/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 × 5.51
3.9 A/38 m
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 that the Schottky
diode must be rated is calculated as the off time of the step-down converter times the minimum switch current of
the TPS65167:
A Schottky diode with 2 A maximum average rectified forward current rating is sufficient for most of the
applications. 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.
Table 9. Rectifier Diode Selection step-down Converter
CURRENT RATING Avg.
Or
Vforward
RθJA
SIZE
COMPONENT SUPPLIER
3A
20V
0.36 at 3A
46
°C/W
S.C.
MBRS320, International Rectifier
2A
20V
0.44V at 2A
75
°C/W
SMB
SL22, Vishay Semiconductor
2A
20V
0.5 at 2A
75
°C/W
SMB
SS22, Fairchild Semiconductor
Copyright 2007–2008, Texas Instruments Incorporated
23
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