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| 型号： | TPS54240DGQ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | GREEN, PLASTIC, MSOP-10 |
| 文件页数： | 29/48页 |
| 文件大小： | 1759K |
| 代理商： | TPS54240DGQ |
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Ioutmax
p mod =
2 ×
× Vout × Cout
p
1
z mod =
2
Resr × Cout
p
p
z
f
=
co
mod
2
sw
p
f
=
co
mod
2
f
gmps
gmea
p
=
÷
÷
è
è
co
out
ref
C
V
R4
V
p
1
C5
2
R4
mod
=
f
p
Re
=
o
C
sr
C8
R4
1
sw
f
p
=
C8
R4
Vout = 50 mv / div (ac coupled)
Output Current = 1 A / div (Load Step 1.5 A to 2.5 A)
Time = 200 usec / div
Vin = 10 V / div
Vout = 2 V / div
EN = 2 V / div
SS/TR = 2 V / div
Time = 5 msec / div
www.ti.com
SLVSAA6 – APRIL 2010
(41)
(42)
(43)
(44)
To determine the compensation resistor, R4, use Equation 45. Assume the power stage transconductance,
gmps, is 10.5A/V. The output voltage, Vo, reference voltage, VREF, and amplifier transconductance, gmea, are
3.3V, 0.8V and 310 mA/V, respectively. R4 is calculated to be 20.2 k, use the nearest standard value of 20.0
k
. Use Equation 46 to set the compensation zero to the modulator pole frequency. Equation 46 yields 4740 pF
for compensating capacitor C5, a 4700 pF is used for this design.
(45)
(46)
A compensation pole can be implemented if desired using an additional capacitor C8 in parallel with the series
combination of R4 and C5. Use the larger value of Equation 47 and Equation 48 to calculate the C8, to set the
compensation pole. C8 is not used for this design example.
(47)
(48)
Discontinuous Mode and Eco Mode Boundary
With an input voltage of 12 V, the power supply enters discontinuous mode when the output current is less than
337 mA. The power supply enters EcoMode when the output current is lower than 5 mA.
The input current draw at no load is 392 mA.
APPLICATION CURVES
Figure 50. Load Transient
Figure 51. Startup With VIN
Copyright 2010, Texas Instruments Incorporated
35
Product Folder Link(s): TPS54240
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相关代理商/技术参数 |
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| TPS54240DGQ | 制造商:Texas Instruments 功能描述:IC STEP-DOWN DC/DC CONVERTER MSOP-10 |
| TPS54240DGQR | 功能描述:直流/直流开关转换器 3.5-42V Inp,2.5A,2.5 MHz SWIFT 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 |
| TPS54240DRCR | 功能描述:直流/直流开关调节器 3.5-42Vin,2.5A SD 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 |
| TPS54240DRCT | 功能描述:直流/直流开关调节器 3.5-42Vin,2.5A SD 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 |
| TPS54240EVM-605 | 功能描述:电源管理IC开发工具 2.5A SWIFT Converter 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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