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| 型号： | TPS62260DRVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.2 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 2 MM, 0.80 MM HEIGHT, GREEN, PLASTIC, SON-6 |
| 文件页数： | 11/32页 |
| 文件大小： | 1061K |
| 代理商： | TPS62260DRVT |
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V
IN
GND
EN
FB
SW
L1
2.2 H
m
MODE
V
=2Vto6V
IN
TPS62261DRV
V
1.8V
Upto600mA
OUT
C
4.7 F
IN
m
C
10 F
OUT
m
V
OUT + VREF
1 )
R
1
R
2
DIL + VOUT
1 *
V
OUT
V
IN
L
f
I
L max + Iout max )
DIL
2
SLVS763D
– JUNE 2007 – REVISED FEBRUARY 2011
Figure 38. TPS62261 Fixed 1.8-V Output
OUTPUT VOLTAGE SETTING
The output voltage can be calculated to:
with an internal reference voltage VREF typical 0.6V.
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.
OUTPUT FILTER DESIGN (INDUCTOR AND OUTPUT CAPACITOR)
The TPS62260 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.
Inductor Selection
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.
(1)
(2)
2007–2011, Texas Instruments Incorporated
19
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS62260DRVT | 制造商:Texas Instruments 功能描述:IC STEP-DOWN CONVERTER SON-6 制造商:Texas Instruments 功能描述:IC, STEP-DOWN CONVERTER, SON-6 |
| TPS62260DRVTG4 | 功能描述:直流/直流开关调节器 2.25MHz 600mA 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 |
| TPS62260EVM-229 | 功能描述:电源管理IC开发工具 TPS62260 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS62260IDRVRQ1 | 功能描述:直流/直流开关转换器 AC 2.25MHz 600mA 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 |
| TPS62260LED-338 | 功能描述:电源管理IC开发工具 TPS62260LED-338 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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