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参数资料
| 型号： | TPS62242DRV |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
| 中文描述： | 2.25兆赫300毫安降压转换器2x2SON/TSOT23包 |
| 文件页数： | 9/29页 |
| 文件大小： | 859K |
| 代理商： | TPS62242DRV |
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VIN
GND
EN
FB
SW
TPS62243DRV
L1
2.2 H
CIN
4.7 F
COUT
10 F
VOUT 1.8V
Upto300mA
MODE
VIN 2.0V to 6V
OUTPUT VOLTAGE SETTING
V
OUT + VREF
1 )
R
1
R
2
with an internal reference voltage VREF typical 0.6 V.
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
Inductor Selection
TPS62240, TPS62242, TPS62243
SLVS762B – JUNE 2007 – REVISED SEPTEMBER 2007
Figure 30. TPS62243 Fixed 1.8 V
The output voltage can be calculated to:
To minimize the current through the feedback divider network, R2 should be 180 k or 360 k. The sum of R1
and R2 should not exceed ~1M, to keep the network robust against noise.
An external feed forward capacitor C1 is required for optimum load transient response. The value of C1 should be
in the range between 22pF and 33pF.
Route the FB line away from noise sources, such as the inductor or the SW line.
The TPS62240 is designed to operate with inductors in the range of 1.5
μH to 4.7μH and with output capacitors in
the range of 4.7
μF to 22μF. The part is optimized for operation with a 2.2μH inductor and 10μF output capacitor.
Larger or smaller inductor values can be used to optimize the performance of the device for specific operation
conditions. For stable operation, the L and C values of the output filter may not fall below 1
μH effective
Inductance and 3.5
μF effective capacitance. Selecting larger capacitors is less critical because the corner
frequency of the L-C filter moves to lower frequencies with fewer stability problems.
The inductor value has a direct effect on the ripple current. The selected inductor has to be rated for its dc
resistance and saturation current. The inductor ripple current (
ΔIL) decreases with higher inductance and
increases with higher VI or VO.
The inductor selection has also impact on the output voltage ripple in PFM mode. Higher inductor values will lead
to lower output voltage ripple and higher PFM frequency, lower inductor values will lead to a higher output
voltage ripple but lower PFM frequency.
Equation 1 calculates the maximum inductor current in PWM mode under static load conditions. The saturation
current of the inductor should be rated higher than the maximum inductor current as calculated with Equation 2.
This is recommended because during heavy load transient the inductor current will rise above the calculated
value.
Copyright 2007, Texas Instruments Incorporated
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Product Folder Link(s): TPS62240 TPS62242 TPS62243
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| TPS62243DRV | 2.25 MHz 300 mA Step Down Converter in 2x2SON/TSOT23 Package |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62242DRVR | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242DRVRG4 | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242DRVT | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242DRVTG4 | 功能描述:直流/直流开关调节器 2.25MHz 300mA Step- Down Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS62242QDDCRQ1 | 功能描述:开关变换器、稳压器与控制器 AC 2.25MHz 300mA SD Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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