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| 型号： | TPS622317DRYR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.22 A SWITCHING REGULATOR, 3800 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1 X 1.50 MM, 0.60 MM HEIGHT, GREEN, PLASTIC, MO-287UFAD, SON-6 |
| 文件页数： | 16/32页 |
| 文件大小： | 1073K |
| 代理商： | TPS622317DRYR |
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TPS62231, TPS62230, TPS62232, TPS62233, TPS62234, TPS62235
TPS62236, TPS62237, TPS62238, TPS62239, TPS622310, TPS622311
TPS622312, TPS622313, TPS622314, TPS622315, TPS622316, TPS622317
www.ti.com
SLVS941D – APRIL 2009 – REVISED AUGUST 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
DIMENSIONS
INDUCTOR TYPE
SUPPLIER
[mH]
[mm3]
1.0/2.2
2.5 × 2.0 × 1.2
LQM2HPN1R0MJ0
Murata
2.2
2.0 × 1.2 × 0.55
LQM21PN2R2
Murata
1.0/2.2
2.0 × 1.2 × 1.0
MIPSZ2012
FDK
1.0/2.2
2.0 × 2.5 × 1.2
MIPSA2520
FDK
1.0/2.2
2.0 × 1.2 × 1.0
KSLI2012 series
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 2.2mF to 4.7mF 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 4.7mF 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 VIN 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 shows a list of tested input/output capacitors.
Table 2. List of Capacitor
CAPACITANCE [mF]
SIZE
CAPACITOR TYPE
SUPPLIER
2.2
0402
GRM155R60J225
Murata
4.7
0402
AMK105BJ475MV
Taiyo Yuden
4.7
0402
GRM155R60J475
Murata
4.7
0402
CL05A475MQ5NRNC
Samsung
4.7
0603
GRM188R60J475
Murata
Copyright 2009–2010, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS622317DRYT | 功能描述:直流/直流开关调节器 3MHz Ultra Small 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 |
| TPS622318DRYR | 功能描述:直流/直流开关转换器 3MHz Ultra Sm 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 |
| TPS622318DRYT | 功能描述:直流/直流开关转换器 3MHz Ultra Sm 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 |
| TPS622319DRYT | 功能描述:IC REG BUCK FIXED 500MA 6SON 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:在售 功能:降压 输出配置:正 拓扑:降压 输出类型:固定 输出数:1 电压 - 输入（最小值）:2.05V 电压 - 输入（最大值）:6V 电压 - 输出（最小值/固定）:1.2V 电压 - 输出（最大值）:- 电流 - 输出:500mA 频率 - 开关:2MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:6-UFDFN 供应商器件封装:6-SON（1.45x1） 标准包装:1 |
| TPS62231DRYR | 功能描述:直流/直流开关转换器 3 MHz Ultra Small 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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