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参数资料
| 型号： | TPS61240YFFR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, 3500 kHz SWITCHING FREQ-MAX, BGA6 |
| 封装： | 0.40 MM PITCH, GREEN, DSBGA-6 |
| 文件页数： | 4/26页 |
| 文件大小： | 755K |
| 代理商： | TPS61240YFFR |
SLVS806A – APRIL 2009 – REVISED MAY 2009
www.ti.com
ENABLE
The device is enabled setting EN pin to high. At first, the internal reference is activated and the internal analog
circuits are settled. Afterwards, the soft start is activated and the output voltage is ramped up. The output
voltages reaches its nominal value in typically 250 ms after the device has been enabled.
The EN input can be used to control power sequencing in a system with various DC/DC converters. The EN pin
can be connected to the output of another converter, to drive the EN pin high and getting a sequencing of supply
rails. With EN = GND, the device enters shutdown mode.
SOFT START
The TPS6124x has an internal soft start circuit that controls the ramp up of the output voltage. The output
voltages reaches its nominal value within tStart of typically 250ms after EN pin has been pulled to high level. The
output voltage ramps up from 5% to its nominal value within tRAMP of typ. 300ms.
This limits the inrush current in the converter during start up and prevents possible input voltage drops when a
battery or high impedance power source is used.
During soft start, the switch current limit is reduced to 300mA until the output voltage reaches VIN. Once the
output voltage trips this threshold, the device operates with its nominal current limit ILIMF.
LOAD DISCONNECT
Load disconnect electrically removes the output from the input of the power supply when the supply is disabled.
This is especially important during shutdown. In shutdown of a boost converter, the load is still connected to the
input through the inductor and catch diode. Since the input voltage is still connected to the output, a small current
continues to flow, even when the supply is disabled. Even small leakage currents significantly reduce battery life
during extended periods of off time.
The benefit of this implemented feature for the system design engineer is that the battery is not depleted during
shutdown of the converter. No additional components must be added to the design to make sure that the battery
is disconnected from the output of the converter.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds 140°C (typical) the device goes into thermal shutdown. In this
mode, the High Side and Low Side MOSFETs are turned-off. When the junction temperature falls below the
thermal shutdown hysteresis, the device continuous operation.
12
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS61240, TPS61241
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS61240YFFT | 功能描述:直流/直流开关调节器 5V, 400mA, 4MHz Step Up DC/DC 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 |
| TPS61240YFFT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| TPS61241 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5-MHz High Efficiency Step-Up Converter |
| TPS61241YFF | 制造商:TI 制造商全称:Texas Instruments 功能描述:3.5-MHz High Efficiency Step-Up Converter |
| TPS61241YFFR | 功能描述:直流/直流开关调节器 5V 500mA 4MHz Step- Up DC/DC Cnvrtr 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 |
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