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| 型号： | TPS40131RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | GREEN, PLASTIC, QFN-32 |
| 文件页数： | 11/40页 |
| 文件大小： | 940K |
| 代理商： | TPS40131RHBR |
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DESIGN EXAMPLE
Two Phase Single Output Configuration from 12 V to 1.5 V DC/DC Converter Using a TPS40131
Setp 1: Inductor Selection
IN(max)
OUT
RIPPLE
IN(max)
SW
V
1
L
I
V
f
-
=
(15)
Step 2: Output Capacitor Slection
(
)
(
)
2
TRAN(max)
OUT(min)
IN(min)
OUT
UNDER
1
I
L
2
C
V
=
-
(16)
(
)
(
)
2
TRAN(max)
OUT(min)
OUT
OVER
1
I
L
2
C
V
=
(17)
OUT
1
2
D
2
D
I
(D)
1
2
D
1
-
-
D
=
-
+
(18)
SLVS635 – FEBRUARY 2007
The following example illustrates the design process and component selection for a two phase single output
synchronous buck converter using TPS40131. The design goal parameters are given in the table below.
Design Goal Parameters
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VIN
Input voltage
10.8
12.0
13.2
V
VOUT
Output voltage
1.5
VRIPPLE
Output ripple
IOUT = 40 A
30
mV
IOUT
Output current
40
A
fSW
Switching frequency
350
kHz
The inductor is determined by the desired ripple current. The required inductor is calculated using Equation 15.
Typically the peak-to-peak inductor current IRIPPLE is selected to be around 20% of the rated output current. In
this design, IRIPPLE is targeted at 23% of IPHASE. The calculated inductor is 0.815 μH and in practical a 0.82-μH,
30-A inductor with 2-m
DCR from Vishay is selected. The real inductor ripple current is 4.63 A.
The output capacitor is typically selected by the output load transient response requirement. Equation 16
estimates the minimum capacitor to reach the undervoltage requirement with load step up. Equation 17
estimates the minimum capacitor for overvoltage requirement with load step down. When VIN(min) < 2×VOUT, the
minimum output capacitance can be calculated using Equation 16. Otherwise, Equation 17 is used.
In this design, VIN(min) is much larger than 2 × VOUT, so Equation 17 is used to determine the minimum
capacitance. Based on a 15-A load transient with a maximum of 80-mV deviation, a minimum 1-mF output
capacitor is required. In the design, six 180-
μF, 6.3-V SP capacitors are selected to meet this requirement. Each
capacitor has an ESR of 5 m
.
Due to the interleaving of channels, the total output ripple current is smaller than the ripple current from a single
phase. The ripple cancellation factor is expressed in Equation 18.
where
D is the duty cycle for a single phase
The maximum output ripple current is calculated in Equation 19.
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40131RHBRG4 | 功能描述:DC/DC 开关控制器 Two-Phase Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40131RHBT | 功能描述:DC/DC 开关控制器 2-Ph Synch Buck Cntr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40131RHBT | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, QFN-32 |
| TPS40131RHBTG4 | 功能描述:DC/DC 开关控制器 Two-Phase Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40132 | 制造商:TI 制造商全称:Texas Instruments 功能描述:TWO-PHASE, SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED MOSFET DRIVERS |
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