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| 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： | 10/29页 |
| 文件大小： | 859K |
| 代理商： | TPS62242DRV |
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DIL + Vout
1 *
Vout
Vin
L
(1)
I
Lmax + Ioutmax )
DIL
2
(2)
Output Capacitor Selection
I
RMSCout + Vout
1 *
Vout
Vin
L
1
2
3
(3)
DVout + Vout
1 *
Vout
Vin
L
1
8
Cout
)
ESR
(4)
TPS62240, TPS62242, TPS62243
SLVS762B – JUNE 2007 – REVISED SEPTEMBER 2007
With:
f = Switching Frequency (2.25 MHz typical)
L = Inductor Value
ΔIL = Peak to Peak inductor ripple current
ILmax = Maximum Inductor current
A more conservative approach is to select the inductor current rating just for the maximum switch current limit
ILIMF of the converter.
Accepting larger values of ripple current allows the use of low inductance values, but results in higher output
voltage ripple, greater core losses, and lower output current capability.
The total losses of the coil have a strong impact on the efficiency of the dc/dc conversion and consist of both the
losses in the dc resistance (R(DC)) and the following frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
Table 1. List of Inductors
DIMENSIONS [mm3]
Inductance
μH
INDUCTOR TYPE
SUPPLIER
2.5
× 2.0 × 1.0
2.0
MIPS2520D2R2
FDK
2.5
× 2.0 × 1.2
2.0
MIPSA2520D2R2
FDK
2.5x2.0x1.0
2.2
KSLI-252010AG2R2
Hitachi Metals
2.5x2.0x1.2
2.2
LQM2HPN2R2MJ0L
Murata
3
× 3 × 1.4
2.2
LPS3015
Coilcraft
The advanced fast-response voltage mode control scheme of the TPS62240 allows the use of tiny ceramic
capacitors. Ceramic capacitors with low ESR values have the lowest output voltage ripple and are
recommended. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric capacitors,
aside from their wide variation in capacitance over temperature, become resistive at high frequencies.
At nominal load current, the device operates in PWM mode and the RMS ripple current is calculated as:
At nominal load current, the device operates in PWM mode and the overall output voltage ripple is the sum of the
voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and discharging the
output capacitor:
At light load currents, the converter operates in Power Save Mode and the output voltage ripple is dependent on
the output capacitor and inductor value. Larger output capacitor and inductor values minimize the voltage ripple
in PFM mode and tighten dc output accuracy in PFM mode.
18
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Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS62240 TPS62242 TPS62243
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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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