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| 型号： | TPS62230EVM-574 |
| 厂商： | Texas Instruments |
| 文件页数： | 24/35页 |
| 文件大小： | 0K |
| 描述： | EVAL MODULE FOR TPS62230-574 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 3，非绝缘，（3电路） |
| 输出电压： | 1.2V，1.8V，2.5V |
| 电流 - 输出： | 500mA |
| 输入电压： | 2.05 ~ 6 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 3MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | TPS62230，TPS62231，TPS62232 |
| 其它名称： | 296-31251 TPS62230EVM-574-ND |
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TPS62230, TPS62231, TPS62232, TPS62233, TPS62234, TPS62235, TPS62236
TPS62237, TPS62238, TPS62239, TPS622310, TPS622311, TPS622312
TPS622313, TPS622314, TPS622315, TPS622316, TPS622317, TPS622318
SLVS941E – APRIL 2009 – REVISED DECEMBER 2010
In high-frequency converter applications, the efficiency is essentially affected by the inductor AC resistance (i.e.,
quality factor) and to a smaller extent by the inductor DCR value. To achieve high efficiency operation, care
should be taken in selecting inductors featuring a quality factor above 25 at the switching frequency. Increasing
the inductor value produces lower RMS currents, but degrades transient response. For a given physical inductor
size, increased inductance usually results in an inductor with lower saturation current.
The total losses of the coil 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
The following inductor series from different suppliers have been used with the TPS6223X converters.
Table 1. List of inductors
INDUCTANCE
[ μ H]
1.0/2.2
2.2
1.0/2.2
1.0/2.2
1.0/2.2
DIMENSIONS
[mm3]
2.5 × 2.0 × 1.2
2.0 × 1.2 × 0.55
2.0 × 1.2 × 1.0
2.0 × 2.5 × 1.2
2.0 × 1.2 × 1.0
INDUCTOR TYPE
LQM2HPN1R0MJ0
LQM21PN2R2
MIPSZ2012
MIPSA2520
KSLI2012 series
SUPPLIER
Murata
Murata
FDK
FDK
Hitachi Metal
OUTPUT CAPACITOR SELECTION
The unique hysteretic PWM control scheme of the TPS62230 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 light load currents the converter operate in Power Save Mode and the output voltage ripple is dependent on
the output capacitor value and the PFM peak inductor current. Higher output capacitor values minimize the
voltage ripple in PFM Mode and tighten DC output accuracy in PFM Mode.
INPUT CAPACITOR SELECTION
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. For most applications a 2.2 μ F to 4.7 μ F ceramic capacitor is recommended. The input capacitor
can be increased without any limit for better input voltage filtering. Because ceramic capacitor loses up to 80% of
its initial capacitance at 5V, it is recommended to use 4.7 μ F input capacitors for input voltages > 4.5V.
Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input and the
power is being supplied through long wires, such as from a wall adapter, a load step at the output or V IN step on
the input can induce ringing at the VIN pin. This ringing can couple to the output and be mistaken as loop
instability or could even damage the part by exceeding the maximum ratings.
Table 2. List of Capacitor
24
CAPACITANCE [ μ F]
2.2
4.7
4.7
4.7
4.7
SIZE
0402
0402
0402
0402
0603
CAPACITOR TYPE
GRM155R60J225
AMK105BJ475MV
GRM155R60J475
CL05A475MQ5NRNC
GRM188R60J475
SUPPLIER
Murata
Taiyo Yuden
Murata
Samsung
Murata
Copyright ? 2009–2010, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS622310DRYR | 功能描述:直流/直流开关转换器 3MHz 500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS622310DRYT | 功能描述:直流/直流开关转换器 3MHz 500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS622311DRYR | 功能描述:直流/直流开关调节器 3MHz,500mA 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 |
| TPS622311DRYT | 功能描述:直流/直流开关调节器 3MHz,500mA 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 |
| TPS622312DRYR | 功能描述:直流/直流开关转换器 3MHz,500mA Step- Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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