- 您现在的位置：买卖IC网 > PDF目录98283 > TPS57040QDGQRQ1 (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 PDF资料下载
参数资料
| 型号： | TPS57040QDGQRQ1 |
| 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： | 13/51页 |
| 文件大小： | 1871K |
| 代理商： | TPS57040QDGQRQ1 |
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页当前第13页第14页第15页第16页第17页第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页第49页第50页第51页
SS/TR
TPS57040-Q1
EN
PWRGD
SS/ TR
EN
PWRGD
VOUT 1
VOUT 2
R 1
R 2
R3
R 4
TPS57040-Q1
Vout2 + deltaV
Vssoffset
R1 =
VREF
Iss
VREF
R1
R2 =
Vout2 + deltaV
VREF
-
deltaV = Vout1
Vout2
-
R1 > 2800
Vout1
180
deltaV
-
SLVSAP4A
– DECEMBER 2010 – REVISED APRIL 2011
DETAILED DESCRIPTION (continued)
Figure 35. Schematic for Ratiometric and Simultaneous Start-Up Sequence
Ratio-metric and simultaneous power supply sequencing can be implemented by connecting the resistor network
of R1 and R2 shown in Figure 35 to the output of the power supply that needs to be tracked or another voltage
reference source. Using Equation 7 and Equation 8, the tracking resistors can be calculated to initiate the Vout2
slightly before, after or at the same time as Vout1. Equation 9 is the voltage difference between Vout1 and Vout2
at the 95% of nominal output regulation.
The deltaV variable is zero volts for simultaneous sequencing. To minimize the effect of the inherent SS/TR to
VSENSE offset (Vssoffset) in the slow start circuit and the offset created by the pullup current source (Iss) and
tracking resistors, the Vssoffset and Iss are included as variables in the equations.
To design a ratio-metric start up in which the Vout2 voltage is slightly greater than the Vout1 voltage when Vout2
reaches regulation, use a negative number in Equation 7 through Equation 9 for deltaV. Equation 9 will result in a
positive number for applications which the Vout2 is slightly lower than Vout1 when Vout2 regulation is achieved.
Since the SS/TR pin must be pulled below 40mV before starting after an EN, UVLO or thermal shutdown fault,
careful selection of the tracking resistors is needed to ensure the device will restart after a fault. Make sure the
calculated R1 value from Equation 7 is greater than the value calculated in Equation 10 to ensure the device can
recover from a fault.
As the SS/TR voltage becomes more than 85% of the nominal reference voltage the Vssoffset becomes larger
as the slow start circuits gradually handoff the regulation reference to the internal voltage reference. The SS/TR
pin voltage needs to be greater than 1.3V for a complete handoff to the internal voltage reference as shown in
(7)
(8)
(9)
(10)
20
Copyright
2010–2011, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| TPS57114QRTERQ1 | SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PQCC16 |
| TPS60100PWP | 0.2 A SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60101PWPG4 | SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60101PWPRG4 | 0.1 A SWITCHED CAPACITOR REGULATOR, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| TPS60230RGTTG4 | 0.2 A SWITCHED CAPACITOR REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PQCC16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS57040QDRCRQ1 | 功能描述:直流/直流开关转换器 3.5-42Vin,0.5A Step Down SWIFT Cnvrtr 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 |
| TPS57060QDGQRQ1 | 功能描述:直流/直流开关转换器 3.5-60Vin,0.5A,2.5 MHz Step Down Cnvrtr 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 |
| TPS57060QDRCRQ1 | 功能描述:直流/直流开关转换器 3.5-60Vin,0.5A,2.5 MHz Step Down Cnvrtr 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 |
| TPS57112QRTERQ1 | 功能描述:直流/直流开关转换器 2.95-6Vin,2A,2MHz Sync St Down Cnvrtr 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 |
| TPS57114EVM | 制造商:Texas Instruments 功能描述:TPS57114EVM - Boxed Product (Development Kits) |
发布紧急采购，3分钟左右您将得到回复。