- 您现在的位置：买卖IC网 > PDF目录297614 > TPS65250RHAR (TEXAS INSTRUMENTS INC) 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40 PDF资料下载
参数资料
| 型号： | TPS65250RHAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件页数： | 10/38页 |
| 文件大小： | 1782K |
| 代理商： | TPS65250RHAR |
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页当前第10页第11页第12页第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
T ms
V
ss
REF
(
) =
( )
(C nF
ss(
)
-
I
A
ss(
)
0.8
2
1
0.8
O
V
R
V
=
×
÷
-
è
FB
0.8V
Vo
+
-
TPS65250
R1
R2
SLVSAA3B – JUNE 2010 – REVISED JANUARY 2011
www.ti.com
Out-of-Phase Operation
Buck 1 has a low conduction resistance compared to Buck 2 and 3. Normally buck 1 is used to drive higher
system loads. Buck 2 and 3 are used to drive some peripheral loads like I/O and line drivers . The combination of
buck 2 and 3’s loads may be on par with Buck 1’s. In order to reduce input ripple current, buck 2 operates in
phase with buck 3; buck 1 and buck 2 operate 180 degrees out-of-phase. This enables the system, having less
input ripple, to lower component cost, save board space and reduce EMI.
Delayed Start-Up
If a delayed start-up is required on any of the buck converters fit a ceramic capacitor to the ENx pins. The delay
added is ~1.67 ms per nF connected to the pin. Note that the EN pins have a weak 1-M
pull-up to the 3V3 rail.
Soft Start Time
The device has an internal pull-up current source of 5 A that charges an external slow start capacitor to
implement a slow start time. Equation 2 shows how to select a slow start capacitor based on an expected slow
start time. The voltage reference (VREF) is 0.8 V and the slow start charge current (Iss) is 5 A. The soft start
circuit requires 1 nF per 200 S to be connected at the SS pin. A 1-ms soft-start time is implemented for all
converters fitting 4.7 nF to the relevant pins.
(2)
Adjusting the Output Voltage
The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to use 1%
tolerance or better divider resistors. In order to improve efficiency at light load, start with 40.2 k
for the R1
resistor and use the Equation 3 to calculate R2.
(3)
Figure 31. Voltage Divider Circuit
Error Amplifier
The device has a transconductance error amplifier. The transconductance of the error amplifier is 130 A/V
during normal operation. The frequency compensation network is connected between the COMP pin and ground.
Loop Compensation
TPS65250 is a current mode control dc/dc converter. The error amplifier is a 130-A/V transconductance
amplifier. A type-II compensation circuit is adequate for the converter to have a phase margin between 60 and 90
degrees.
18
Copyright 2010–2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65250
相关PDF资料 |
PDF描述 |
|---|---|
| TPSD336K020R0200 | KONDENSATOR TANTAL SMD 33UF 20V |
| TPSD336K035R0300 | KONDENSATOR TANTAL SMD 33UF 35V |
| TPSD476K016R0150 | KONDENSATOR TANTAL SMD 47UF 16V |
| TPSD476K025R0250 | KONDENSATOR TANTAL SMD 47UF 25V |
| TPSD686K016R0150 | KONDENSATOR TANTAL SMD 68UF 16V |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS65250RHAT | 功能描述:PMIC 解决方案 PMU w/3 DC/DC Cnvrtr & Charge & Pump RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| TPS652510EVM | 功能描述:电源管理IC开发工具 TPS652510 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 |
| TPS652510RHAR | 功能描述:PMIC 解决方案 3 DC-DC Converters RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| TPS652510RHAT | 功能描述:PMIC 解决方案 3 DC-DC Converters RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| TPS65251-1RHAT | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.8V 3 Output 3A, 2A 40-VFQFN Exposed Pad 制造商:texas instruments 系列:- 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:3 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:18V 电压 - 输出（最小值/固定）:0.8V 电压 - 输出（最大值）:17V 电流 - 输出:3A，2A 频率 - 开关:300kHz ~ 2.2MHz 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:40-VFQFN 裸露焊盘 供应商器件封装:40-VQFN（6x6） 标准包装:1 |
发布紧急采购，3分钟左右您将得到回复。