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| 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： | 3/26页 |
| 文件大小： | 755K |
| 代理商： | TPS61240YFFR |
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L
V
I
IN
L
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I
=I
VALLEY
LIM
IL
f
IPEAK
Rectifier
Current
IOUT(DC)
Inductorr
Current
Increased
LoadCurrent
IIN(DC)
CurrentLimit
Threshold
IOUT(CL)
DIL
PFMmodeatlightload
PWMmodeatheavyload
Output
Voltage
PFMrippleabout0.015xVOUT
1.006xVOUT NOM.
VOUT NOM.
www.ti.com
SLVS806A – APRIL 2009 – REVISED MAY 2009
Figure 17. Inductor/Rectifier Currents in Current Limit Operation
POWER-SAVE MODE
The TPS6124x family of devices integrates a power save mode to improve efficiency at light load. In power save
mode the converter only operates when the output voltage trips below a set threshold voltage. It ramps up the
output voltage with several pulses and goes into power save mode once the output voltage exceeds the set
threshold voltage.
The PFM mode is left and PWM mode entered in case the output current can not longer be supported in PFM
mode.
UNDER-VOLTAGE LOCKOUT
The under voltage lockout circuit prevents the device from malfunctioning at low input voltages and from
excessive discharge of the battery. It disables the output stage of the converter once the falling VIN trips the
under-voltage lockout threshold VUVLO. The under-voltage lockout threshold VUVLO for falling VIN is typically 2.0V.
The device starts operation once the rising VIN trips under-voltage lockout threshold VUVLO again at typ. 2.1V.
INPUT OVER-VOLTAGE PROTECTION
In the event of an overvoltage condition appearing on the input rail, the output voltage will also experience the
overvoltage due to being in dropout condition. A input overvoltage protection feature has been implemented into
the TPS6124x which has an input overvoltage threshold of 6.0V. Once this level is triggered, the device will go
into a shutdown mode to protect itself. If the voltage drops to 5.9V or below, the device will startup once more
into normal operation.
Copyright 2009, Texas Instruments Incorporated
11
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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