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| 型号： | TPS61085PW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | GREEN, PLASTIC, TSSSOP-8 |
| 文件页数： | 24/25页 |
| 文件大小： | 781K |
| 代理商： | TPS61085PW |
DETAILED DESCRIPTION
COMP
FB
GM Amplifier
Vref
SW
GateDriverof
Power
Transistor
IN
SS
PWM
Generator
Currentlimit
and
SoftStart
ToffGenerator
Ton
PGND
BiasVref = 1.24 V
UVLO
ThermalShutdown
EN
FREQ
VIN
VS
SLVS859 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
Figure 11. Block Diagram
The boost converter is designed for output voltages up to 18.5 V with a switch peak current limit of 2.0 A
minimum. The device, which operates in a current mode scheme with quasi-constant frequency, is externally
compensated for maximum flexibility and stability. The switching frequency is selectable between 650 kHz and
1.2 MHz and the minimum input voltage is 2.3 V. To control the inrush current at start-up a soft-start pin is
available.
During the on-time, the voltage across the inductor causes the current in it to rise. When the current reaches a
threshold value set by the internal GM amplifier, the power transistor is turned off, the energy stored into the
inductor is then released and the current flows through the Schottky diode towards the output of the boost
converter. The off-time is fixed for a certain VIN and VS, and therefore maintains the same frequency when
varying these parameters.
However, for different output loads, the frequency may slightly change due to the voltage drop across the Rdson
of the power transistor which will have an effect on the voltage across the inductor and thus on tON (tOFF remains
fixed). Some slight frequency changes might also appear with a fixed output load due to the fact that the output
voltage VS is not sensed directly but via the SW Pin, which affects accuracy.
Because of the quasi-constant frequency behavior of the device, the TPS61085 eliminates the need for an
internal oscillator and slope compensation, which provides better stability for the system over a wide of input and
output voltages range, and more stable and accurate current limiting operation compared to boost converters
operating with a conventional PWM scheme. The TPS61085 topology has also the benefits of providing very
good load and line regulations, and excellent load transient response.
8
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS61085
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相关代理商/技术参数 |
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| TPS61085PWG4 | 功能描述:直流/直流开关调节器 650kHz 1.2MHz 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 |
| TPS61085PWR | 功能描述:直流/直流开关调节器 650kHz 1.2MHz 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 |
| TPS61085PWRG4 | 功能描述:直流/直流开关调节器 650kHz 1.2MHz 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 |
| TPS61085-Q1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:650-kHz/1.2-MHz 18.5-V STEP-UP DC-DC CONVERTER |
| TPS61085-Q1EVM | 功能描述:EVAIL MOD 制造商:texas instruments 系列:* 零件状态:在售 标准包装:1 |
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