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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： | 2/26页 |
| 文件大小： | 755K |
| 代理商： | TPS61240YFFR |
V
=3.6V
I
=150mA
IN
OUT
V
=5V
OUT
EN=5V/div
I
=200mA/div
COIL
V
=2V/div
OUT
t-TimeBase-100
s/div
m
V
=3.6V
I
=150mA
IN
OUT
V
=5V
OUT
EN=5V/div
I
=200mA/div
COIL
V
=1V/div
OUT
V
=1V/div
IN
t-TimeBase-200
s/div
m
-
D
OUT
IN
OUT(CL)
VALLEY
L
OUT
V
1
V
D
I
= (1
D)
(I
+
I )
with I =
and D
2
L
f
V
SLVS806A – APRIL 2009 – REVISED MAY 2009
www.ti.com
Figure 15. Startup After Enable – With Load
Figure 16. Startup and Shutdown
DETAILED DESCRIPTION
OPERATION
The TPS6124x Boost Converter operates with typically 3.5MHz fixed frequency pulse width modulation (PWM) at
moderate to heavy load currents. At light load currents the converter will automatically enter Power Save Mode
and operates then in PFM (Pulse Frequency Modulation) mode. During PWM operation the converter uses a
unique fast response quasi-constant on-time valley current mode controller scheme which allows “Best in Class”
line and load regulation allowing the use of small ceramic input and output capacitors.
Based on the VIN/VOUT ratio, a simple circuit predicts the required on-time. At the beginning of the switching
cycle, the low-side N-MOS switch is turned-on and the inductor current ramps up to a defined peak current. In
the second phase, once the peak current is reached, the current comparator trips, the on-timer is reset turning off
the switch, and the current through the inductor then decays to an internally set valley current limit. Once this
occurs, the on-timer is set to turn the boost switch back on again and the cycle is repeated.
CURRENT LIMIT OPERATION
The current limit circuit employs a valley current sensing scheme. Current limit detection occurs during the off
time through sensing of the voltage drop across the synchronous rectifier.
The output voltage is reduced as the power stage of the device operates in a constant current mode. The
maximum continuous output current (IOUT(CL)), before entering current limit operation, can be defined by
Equation 1 as shown.
(1)
Figure 17 illustrates the inductor and rectifier current waveforms during current limit operation. The output
current, IOUT, is the average of the rectifier ripple current waveform. When the load current is increased such that
the lower peak is above the current limit threshold, the off time is lengthened to allow the current to decrease to
this threshold before the next on-time begins (so called frequency fold-back mechanism).
10
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS61240, TPS61241
相关PDF资料 |
PDF描述 |
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| TPS61260DRVR | 0.1 A SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO6 |
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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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