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| 型号： | TPS2012APWPG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO14 |
| 封装： | PLASTIC, HTSSOP-14 |
| 文件页数： | 10/28页 |
| 文件大小： | 1282K |
| 代理商： | TPS2012APWPG4 |
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APPLICATION INFORMATION
POWER-SUPPLY CONSIDERATIONS
OVERCURRENT
POWER DISSIPATION AND JUNCTION TEMPERATURE
P
D +
r
DS(on)
I2
(1)
T
J +
P
D
R
q
JA )
T
A
(2)
SLVS189C – DECEMBER 1998 – REVISED SEPTEMBER 2007
Figure 35. Typical Application
A 0.01-
μF to 0.1-μF ceramic bypass capacitor between IN and GND, close to the device, is recommended.
Placing a high-value electrolytic capacitor on the output and input pins is recommended when the output load is
heavy. This precaution reduces power supply transients that may cause ringing on the input. Additionally,
bypassing the output with a 0.01-
μF to 0.1-μF ceramic capacitor improves the immunity of the device to
short-circuit transients.
A sense FET checks for overcurrent conditions. Unlike current-sense resistors, sense FETs do not increase the
series resistance of the current path. When an overcurrent condition is detected, the device maintains a constant
output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault is present
long enough to activate thermal limiting.
Three possible overload conditions can occur. In the first condition, the output has been shorted before the
device is enabled or before VI(IN) has been applied (see Figure 6). The TPS201xA senses the short and
immediately switches into a constant-current output.
In the second condition, the excessive load occurs while the device is enabled. At the instant the excessive load
occurs, very high currents may flow for a short time before the current-limit circuit can react (see
Figure 12–Figure 19). After the current-limit circuit has tripped (reached the overcurrent trip threshold) the device
switches into constant-current mode.
In the third condition, the load has been gradually increased beyond the recommended operating current. The
current is permitted to rise until the current-limit threshold is reached or until the thermal limit of the device is
exceeded (see Figures Figure 77–Figure 10). The TPS201xA is capable of delivering current up to the
current-limit threshold without damaging the device. Once the threshold has been reached, the device switches
into its constant-current mode.
The low on-resistance on the n-channel MOSFET allows small surface-mount packages, such as SOIC, to pass
large currents. The thermal resistance of these packages are high compared to those of power packages; it is
good design practice to check power dissipation and junction temperature. The first step is to find rDS(on) at the
input voltage and operating temperature. As an initial estimate, use the highest operating ambient temperature of
interest and read rDS(on) from SLVS1892074Figure 30–Figure 33 . Next, calculate the power dissipation using:
Finally, calculate the junction temperature:
18
Copyright 1998–2007, Texas Instruments Incorporated
Product Folder Link(s): TPS2010A, TPS2011A TPS2012A, TPS2013A
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相关代理商/技术参数 |
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| TPS2012APWPR | 功能描述:电源开关 IC - 配电 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| TPS2012APWPRG4 | 功能描述:电源开关 IC - 配电 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| TPS2012B | 功能描述:台式示波器 Digital ColorDisplay 100MHz 1GS/s 2-Ch RoHS:否 制造商:Teledyne LeCroy 通道:4 带宽:1 GHz 采样比:2.5 GS/s 显示器类型:Color TFT, LCD 输入电压:100 VAC to 240 VAC 设备类型:Digital Oscilloscopes 电缆类型:Global Power Cord Sets Included |
| TPS2012D | 功能描述:电源开关 IC - 配电 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| TPS2012DG4 | 功能描述:电源开关 IC - 配电 2.0A 2.7-5.5V Single Hi-Side MOSFET RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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