Maxim MAX17595峰值电流模式反激和升压电源解决方案

发布时间:2012-2-20 20:44    发布者:1770309616
关键词: MAX17595 , Maxim , 电源 , 峰值电流模式反激 , 升压
Maxim公司的MAX17595/MAX17596/MAX17597是峰值电流模式控制器,包括了设计宽输入电压范围反激和升压稳压电源所有的电路,开关频率从100kHz到1MHz可编程,起动电流20uA,电流模式控制提供极好的瞬态响应,可编程的频率抖动适合低EMI广谱工作. MAX17595适合通用输入AC/DC转换器和36V-72V输入通信DC/DC转换器, MAX17596适合4.5V-36V输入电压的DC/DC转换器.器件主要用在通用输入离线AC/DC电源,宽范围DC输入反激/升压电池充电器,以电池为能源的应用以及工业,通信和汽车电子.本文介绍了MAX17595/MAX17596/MAX17597主要优势和特性,方框图,以及通用离线隔离电源, DC/DC应用电源和异步升压转换器的应用电路图.

The MAX17595/MAX17596/MAX17597 is a family of peak-current-mode controllers which contain all the circuitry required for the design of wide input-voltage flyback and boost regulators. The MAX17595 offers optimized input rising and falling thresholds for universal input AC-DC converters and telecom DC-DC (36V–72V input range) power supplies. The MAX17596 offers input rising and falling thresholds suitable for low-voltage DC-DC applications (4.5V–36V input range). The MAX17597 offers all circuitry needed to implement a boost converter controller. All three controllers contain a built-in gate driver for external n-channel MOSFETs.

The MAX17595/MAX17596/MAX17597 house an inter nal error amplifier with 1% accurate reference, useful in implementations without the need for an external reference. The switching frequency is programmable from 100kHz to 1MHz with an accuracy of 8% using an external resistor, allowing optimization of magnetic and filter components, resulting in compact and cost-effective power conversion solutions. For EMI sensitive applica tions, the MAX17595/MAX17596/MAX17597 family incor porates a programmable-frequency dithering scheme, enabling low-EMI spread-spectrum operation.

An EN/UVLO input allows the user to start the power supply precisely at the desired input voltage, while also functioning as an on/off pin. The OVI pin enables implementation of an input overvoltage protection scheme, ensuring that the converter shuts down when the DC input voltage exceeds a set maximum value. The SS pin allows programmable soft-start time for the power converter, and helps limit inrush current during startup. The MAX17595/MAX17596/MAX17597 family also allows the designer to choose between voltage soft-start and current soft-start modes, useful in optoisolated designs. A programmable slope compensation scheme is pro vided to enhance the stability of the peak-current-mode control scheme.Hiccup-mode overcurrent protection and thermal shutdown are provided to minimize dissipation in overcurrent and overtemperature fault conditions. The IC is available in a space-saving 16-pin, 3mm x 3mm TQFN package with 0.5mm lead spacing.

MAX17595/MAX17596/MAX17597主要优势和特性:

Peak Current Mode Offline (Universal Input AC) and Telecom (36V–72V) Flyback Controller (MAX17595)

Peak-Current-Mode DC-DC Flyback Controller (4.5V–36V Input Range) (MAX17596)

Peak-Current-Mode Nonsynchronous Boost PWM Controller (4.5V–36V Input Range) (MAX17597)

Current Mode Control Provides Excellent Transient Response

Low 20μA Startup Supply Current

100kHz to 1MHz Programmable Switching Frequency

Programmable Frequency Dithering for Low-EMI Spread-Spectrum Operation

Switching Frequency Synchronization

Adjustable Current Limit with External Current- Sense Resistor

Fast Cycle-By-Cycle Peak Current Limiting

Hiccup-Mode Short-Circuit Protection

Overtemperature Protection

Programmable Soft-Start and Slope Compensation

Programmable Voltage or Current Soft-Start Schemes

Input Overvoltage Protection

Space-Saving, 3mm x 3mm TQFN Package

MAX17595/MAX17596/MAX17597应用:

Universal Input Offline AC-DC Power Supplies

Wide-Range DC-Input Flyback/Boost Battery Chargers

Battery-Powered Applications

Industrial, Telecom, and Automotive Applications
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图1.MAX17595/MAX17596/MAX17597方框图
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图2.MAX17595典型应用电路图(通用离线隔离电源)
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图3.MAX17596典型应用电路图(DC/DC应用电源)
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图4.MAX17597典型应用电路图(异步升压转换器)
详情请见:
MAX17595-MAX17597.pdf (2.43 MB)

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