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參數(shù)資料
| 型號(hào)： | TPS65170RHDT |
| 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, PQCC28 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-28 |
| 文件頁數(shù)： | 6/35頁 |
| 文件大?。?/td> | 4698K |
| 代理商： | TPS65170RHDT |
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IN
S
LIM
SW
V
D
I
=
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D
2
L
-
-
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S
IN
SW(PK)
SW
I
V
D
I
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D(AVG)
F
P = I
V
SLVSA27 – OCTOBER 2009
www.ti.com
Calculate Maximum Output Current (Boost Converter)
The maximum output current IS that the boost converter can supply can be calculated using Equation 3. The
minimum specified output current occurs at the maximum duty cycle (which occurs at minimum VIN) and
minimum frequency (600kHz).
(3)
Where ILIM is the minimum specified switch current limit (2.8A) and SW is the converter switching frequency.
Calculate Peak Switch Current (Boost Converter)
Equation 4 can be used to calculate the peak switch current occurring in a given application. The worst-case
(maximum) peak current occurs at the minimum input voltage and maximum duty cycle.
(4)
Inductor Selection (Boost Converter)
The boost converter is designed for use with inductors in the range 6.8H to 15H. A 10H inductor is typical.
Inductors should be capable of supporting at least 125% of the peak current calculated by Equation 4 without
saturating. This ensures sufficient margin to tolerate heavy load transients. Alternatively, a more conservative
approach can be used in which an inductor is selected whose saturation current is greater than the maximum
switch current limit (4.2A).
Another important parameter is DC resistance, which can significantly affect the overall converter efficiency.
Physically larger inductors tend to have lower DC resistance (DCR) because they can use thicker wire. The type
and core material of the inductor can also affect efficiency, sometimes by as much as 10%. Table 1 shows some
suitable inductors.
Table 1. Boost Converter Inductor Selection
PART NUMBER
INDUCTOR VALUE
COMPONENT SUPPLIER
SIZE (L×W×H mm)
ISAT / DCR
CDRH8D43
10 H
Sumida
8.3 × 8.3 × 4.5
4A / 29 m
Ω
CDRH8D38
10 H
Sumida
8.3 × 8.3 × 4
3A / 38 m
Ω
MSS 1048-103
10 H
Coilcraft
10.5 × 10.5 × 5.1
4.8A / 26 m
Ω
744066100
10 H
Wuerth
10 × 10 × 3.8
4A / 28 m
Ω
Rectifier Diode Selection (Boost Converter)
For highest efficiency, the rectifier diode should be a Schottky type. Its reverse voltage rating should be higher
than the maximum output voltage VS. The average rectified forward current through the diode is the same as the
output current.
(5)
A Shottky diode with 2A average rectified current rating is adequate for most applications. Smaller diodes can be
used in applications with lower output current, however, the diode must be able to handle the power dissipated in
it, which can be calculated using Equation 6. Table 2 lists some diodes suitable for use in typical applications.
(6)
Table 2. Boost Converter Rectifier Diode Selection
PART NUMBER
VR / IAVG
VF
RθJA
SIZE
COMPONENT SUPPLIER
MBRS320
20V / 3A
0.44V at 3A
46°C/W
SMC
International Rectifier
SL22
20V / 2A
0.44V at 2A
75°C/W
SMB
Vishay Semiconductor
SS22
20V / 2A
0.50V at 2A
75°C/W
SMB
Fairchild Semiconductor
14
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS65170
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