- 您现在的位置：买卖IC网 > PDF目录69510 > TPS54240DGQ (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 PDF资料下载
参数资料
| 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： | 18/48页 |
| 文件大小： | 1759K |
| 代理商： | TPS54240DGQ |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
VSENSE
COMP
VO
R1
R3
C1
C2
R2
CO
RO
gmea
310 A/V
m
0.8V
PowerStage
gm
10.5 A/V
ps
PH
RESR
COUT
RL
b
a
c
www.ti.com
SLVSAA6 – APRIL 2010
DETAILED DESCRIPTION (continued)
Figure 45. Small Signal Model for Loop Response
Simple Small Signal Model for Peak Current Mode Control
Figure 46 describes a simple small signal model that can be used to understand how to design the frequency
compensation. The TPS54240 power stage can be approximated to a voltage-controlled current source (duty
cycle modulator) supplying current to the output capacitor and load resistor. The control to output transfer
function is shown in Equation 14 and consists of a dc gain, one dominant pole, and one ESR zero. The quotient
of the change in switch current and the change in COMP pin voltage (node c in Figure 45) is the power stage
transconductance. The gmPS for the TPS54240 is 10.5 A/V. The low-frequency gain of the power stage
frequency response is the product of the transconductance and the load resistance as shown in Equation 15.
As the load current increases and decreases, the low-frequency gain decreases and increases, respectively. This
variation with the load may seem problematic at first glance, but fortunately the dominant pole moves with the
load current (see Equation 16). The combined effect is highlighted by the dashed line in the right half of
Figure 46. As the load current decreases, the gain increases and the pole frequency lowers, keeping the 0-dB
crossover frequency the same for the varying load conditions which makes it easier to design the frequency
compensation. The type of output capacitor chosen determines whether the ESR zero has a profound effect on
the frequency compensation design. Using high ESR aluminum electrolytic capacitors may reduce the number
frequency compensation components needed to stabilize the overall loop because the phase margin increases
from the ESR zero at the lower frequencies (see Equation 17).
Copyright 2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS54240
相关PDF资料 |
PDF描述 |
|---|---|
| TPS54262QPWPRQ1 | SWITCHING REGULATOR, PDSO20 |
| TPS54286PWPG4 | 3.6 A DUAL SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO14 |
| TPS54283PWPR | 3.6 A DUAL SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO14 |
| TPS54286PWPRG4 | 3.6 A DUAL SWITCHING CONTROLLER, 750 kHz SWITCHING FREQ-MAX, PDSO14 |
| TPS54290PWP | 4.6 A DUAL SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。