- 您现在的位置：买卖IC网 > PDF目录69504 > TPS2420RSAR (TEXAS INSTRUMENTS INC) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 PDF资料下载
参数资料
| 型号： | TPS2420RSAR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封装： | 4 X 4 MM, PLASTIC, QFN-16 |
| 文件页数： | 27/29页 |
| 文件大小： | 1368K |
| 代理商： | TPS2420RSAR |
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页当前第27页第28页第29页
FAULT
CT
3
T
C
38.9 10
=
6
SD
CT
T
1.0
10
C
=
IFLT
FAULT
200k
R
I
W
=
IMAX
201k
R
I
W
=
www.ti.com
SLUS903C – JANUARY 2009 – REVISED AUGUST 2010
PIN DESCRIPTION
CT: Connect a capacitor form CT to GND to set the fault time. The fault timer starts when the fault current
threshold is exceeded, charging the capacitor with 36 mA from GND towards an upper threshold of 1.4 V. If the
capacitor reaches the upper threshold, the internal pass MOSFET is turned off. The MOSFET will stay off until
EN is cycled if a latching version is used. If an auto-retry version is used, the capacitor will discharge at 5 mA to
0.2 V and then re-enable the pass MOSFET. When the device is disabled, CT is pulled to GND through a
100-k
resistor.
The timer period must be chosen long enough to allow the external load capacitance to charge. The fault timer
period is selected using the following formula where TFAULT is the minimum timer period in seconds and CCT is in
Farads.
(1)
This equation does not account for component tolerances. In autoretry versions, the second and subsequent
retry timer periods will be approximately 85% as long as the first retry period.
In autoretry versions, the fault timer discharges the capacitor for a nominal TSD in seconds with CCT in Farads per
the following equation.
(2)
The nominal ratio of on to off times represents about a 3% duty cycle when a hard fault is present on the output
of an autoretry version device.
FLT: Open-drain output that pulls low on any condition that causes the output to open. These conditions are
either an overload with a fault time-out, or a thermal shutdown. FLT becomes operational before UV, when VIN is
greater than 1 volt.
GND: This is the most negative voltage in the circuit and is used as reference for all voltage measurements
unless otherwise specified.
IFLT: A resistor connected from this pin to ground sets the fault current threshold (IFAULT). Currents between the
fault current threshold and the current limit are permitted to flow unimpeded for the period set by the fault timer
programmed on CT. This permits loads to draw momentary surges while maintaining the protection provided by a
lower average-current limit.
The fault timer implemented by CT starts charging CT when current through VIN exceeds IFAULT. If the current
doesn’t drop below the IFAULT level before VCT reaches its upper threshold, the output will be shut off. The fault
current resistor is set by the following formula where IFAULT is in Amperes and RRFLT is in ohms.
(3)
IMAX: A resistor connected from this pin to ground sets IMAX. The TPS2420 will limit current to IMAX. If the current
does not drop below the IFAULT level before the timer times out then the output will be shut off. RMAX is set by the
formula:
(4)
IMAX must be set sufficiently larger than IFAULT to ensure that lMAX could never be less than IFAULT, even after
taking tolerances into account.
EN: When this pin is pulled low, the device is enabled. The input threshold is hysteretic, allowing the user to
program a startup delay with an external RC circuit. EN is pulled to VIN by a 10-M resistor, pulled to GND by
16.8 M
and is clamped to ground by a 7-V Zener diode. Because high impedance pullup/down resistors are
used to reduce current draw, any external FET controlling this pin should be low leakage.
Copyright 2009–2010, Texas Instruments Incorporated
7
Product Folder Link(s): TPS2420
相关PDF资料 |
PDF描述 |
|---|---|
| TPS2458RHBT | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| TPS2458RHBR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| TPS24720RGTT | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| TPS24720RGTR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| TPS2500DRCT | 6 A SWITCHING REGULATOR, 1075 kHz SWITCHING FREQ-MAX, PDSO10 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS2420RSAT | 功能描述:热插拔功率分布 Int FET 0-5A Dual Fault Threshold RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2420RSAT | 制造商:Texas Instruments 功能描述:Hot Swap Contoller IC |
| TPS2421-1DDA | 功能描述:热插拔功率分布 3-20V Integ FET 0-5A Hot Swap RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2421-1DDAR | 功能描述:热插拔功率分布 3-20V Integ FET 0-5A Hot Swap RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| TPS2421-1EVM-02 | 功能描述:电源管理IC开发工具 TPS2421-1 Hot Swap Controller 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。