Peak-Current-Mode Controllers for Flyback and Boost Regulators

Description

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The MAX17595/MAX17596/MAX17597 is a family of peak-current-mode controllers for design of wide input-voltage flyback and boost regulators. The MAX17595 offers optimized input thresholds for universal input AC-DC converters and telecom DC-DC (36V to 72V input range) power supplies. The MAX17596/MAX17597 offer input thresholds suitable for low-voltage DC-DC applications (4.5V to 36V). The MAX17597 implements a boost converter. 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, eliminating the need for an external reference. The switching frequency is programmable from 100kHz to 1MHz with an accuracy of 8%, allowing optimization of magnetic and filter components, resulting in compact and cost-effective power conversion. For EMI-sensitive applications, the MAX17595/MAX17596/MAX17597 family incorporates a programmable frequency dithering scheme, enabling low-EMI spread-spectrum operation.

Users can start the power supply precisely at the desired input voltage, implement input overvoltage protection, and program soft-start time. A programmable slope compensation scheme is provided to ensuree 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.

Key Features

• Programmable Switching Frequency Allows Optimization of the Magnetic and Filter Components, Resulting in Compact, Cost-Effective, Efficient Isolated/Non-Isolated Power Supplies
  • 100kHz to 1MHz Programmable Switching Frequency with Optional Synchronization
  • Peak Current Mode Control Provides Excellent Transient Response
    • Offline (Universal Input AC) and Telecom (36V to 72V) Flyback Controller—MAX17595
    • DC-DC (4.5V to 36V) Flyback Controller—MAX17596
    • Nonsynchronous (4.5V to 36V) Boost PWM Controller—MAX17597
  • 3mm x 3mm TQFN Package
• Programmable Frequency Dithering Enables Low-EMI Spread-Spectrum Operation
• Integrated Protection Features Enhance System Reliability
  • 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
  • Input Overvoltage Protection

Applications/Uses

• Battery-Powered Applications
• Industrial and Telecom Applications
• Universal Input Offline AC-DC Power Supplies
• Wide-Range DC-Input Flyback/Boost Battery Chargers