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| 型号： | TPS65167ARHARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4.9 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, QFN-40 |
| 文件页数： | 16/41页 |
| 文件大小： | 1270K |
| 代理商： | TPS65167ARHARG4 |
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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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|---|---|
| TPS65167EVM-277 | 功能描述:电源管理IC开发工具 TPS65167 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS65167RHAR | 功能描述:其他电源管理 Compact LCD Bias Supply RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| TPS65167RHARG4 | 功能描述:LCD 驱动器 12V/3.5A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| TPS65167RHAT | 功能描述:其他电源管理 Compact LCD Bias Supply RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| TPS65167RHATG4 | 功能描述:LCD 驱动器 12V/3.5A(I/O) 4-CH Multi-Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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