Maxim公司的MAX17595/MAX17596/MAX17597是峰值電流模式控制器,包括了設計寬輸入電壓范圍反激和升壓穩(wěn)壓電源所有的電路,開關頻率從100kHz到1MHz可編程,起動電流20uA,電流模式控制提供極好的瞬態(tài)響應,可編程的頻率抖動適合低EMI廣譜工作. MAX17595適合通用輸入AC/DC轉換器和36V-72V輸入通信DC/DC轉換器, MAX17596適合4.5V-36V輸入電壓的DC/DC轉換器.器件主要用在通用輸入離線AC/DC電源,寬范圍DC輸入反激/升壓電池充電器,以電池為能源的應用以及工業(yè),通信和汽車電子.本文介紹了MAX17595/MAX17596/MAX17597主要優(yōu)勢和特性,方框圖,以及通用離線隔離電源, DC/DC應用電源和異步升壓轉換器的應用電路圖.
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 internal 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 applications, the MAX17595/MAX17596/MAX17597 family incorporates 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 provided 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主要優(yōu)勢和特性:
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應用:
Universal Input Offline AC-DC Power Supplies
Wide-Range DC-Input Flyback/Boost Battery Chargers
Battery-Powered Applications
Industrial, Telecom, and Automotive Applications
圖1.MAX17595/MAX17596/MAX17597方框圖
圖2.MAX17595典型應用電路圖(通用離線隔離電源)
圖3.MAX17596典型應用電路圖(DC/DC應用電源)
圖4.MAX17597典型應用電路圖(異步升壓轉換器)
詳情請見:
http://datasheets.maxim-ic.com/en/ds/MAX17595-MAX17597.pdf
