TI TPS61170 1.2A 升压稳压器方案

TI 公司的TPS61170 是单片高压开关升压稳压器，它集成了1.2A  40V 功率 MOSFET，可以配置成多种标准稳压器，包括升压稳压器和SEPIC。TPS61170的输入电压3-18伏，输出电压可高达38伏，广泛用于5V到12V和24V,12V到 24V的升压转换以及ADSL调制解调器。本文介绍了TPS61170的主要性能，方框图以及各种典型应用电路图和评估板电路图与材料清单。

1.2A High Voltage Boost Converter in 2x2mm2 QFN Package



The TPS61170 is a monolithic high voltage switching regulator with integrated 1.2-A, 40-V power MOSFET. It can be configured in several standard switching-regulator topologies, including boost and SEPIC. The device has a wide input-voltage range to support applications with input voltage from multi-cell batteries or regulated 5-V, 12-V power rails.

The TPS61170 uses a 1.2-MHz switching frequency, allowing the use low-profile inductors and low-value ceramic input and output capacitors. The external loop compensation gives the user flexibility to optimize loop compensation and transient response. The device has built-in protection features, such as pulse-by-pulse overcurrent limit, soft start and thermal shutdown.

The feedback reference voltage of the FB pin is 1.229V. It can be lowered using a 1-wire digital interface (Easyscale protocol) through the CTRL pin. Alternatively, a pulsewidth-modulation (PWM) signal can be applied to the CTRL pin. The duty cycle of the signal reduces the feedback reference voltage proportionally.
The TPS61170 is available in a 6-pin 2 mm × 2 mm QFN package, allowing a compact power-supply solution.
主要性能：
3-V to 18-V Input Voltage Range
High Output Voltage: Up to 38 V
1.2-A integrated Switch
1.2-MHz Fixed Switching Frequency
12 V at 300 mA and 24 V at 150 mA from 5-V Input (Typical)
Up to 93% Efficiency
On-The-Fly Output Voltage Reprogramming
Skip-Switching Cycle for Output Regulation at Light Load
Built-in Soft Start
6-Pin, 2 mm × 2 mm QFN Package

应用：
5-V to 12-V and 24-V, 12-V to 24-V Boost Converter
Buck Boost Regulation Using SEPIC Topology
ADSL Modems



图1。TPS61170方框图



图2。TPS61170典型应用电路图



图2。12V 到 24V DC/DC电源转换



图3。带可编程反馈基准电压的5V 到12V DC/DC 电源转换



图4。12V SEPIC (升降压)转换器

TPS61170评估板特性：
The TPS61170 integrated circuit (IC) has a maximum input voltage of 18 V and can boost its input voltage up to 37 V. Changes to this EVMs operating input and output voltage range likely requires changing one or more of the following components: Schottky diode, input or output capacitors, inductor, feedback resistors, or error amplifier compensation components. Consult the data sheet and/or design tools for assistance in selecting these components for your application.

3 V to 18 V Input Voltage Range
High Output Voltage: Up to 38 V
1.2 A Integrated Switch
1.2 MHz Fixed Switching Frequency
Programmable reference voltage using PWM signal or Easyscale
Built-in Soft Start



图5。TPS61170EVM评估板电路图

下表为TPS61170EVM-280 材料清单