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MAXREFDES1187: 7.5W 5V Offline Flyback Converter Using the MAX17595

MAXREFDES1187

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Description

The MAX17595 is a peak-current-mode controller for designing wide input-voltage flyback regulators. The MAX17595 offers optimized input thresholds for universal input AC-DC converters and telecom DC-DC (36V to 72V input range) power supplies. It contains a built-in gate driver for an external n-channel MOSFET. The MAX17595 houses 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 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 ensure 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.

Features

  • Programmable Switching Frequency Allows Optimization of the Magnetic and Filter Components, Resulting in Compact, Cost-Effective, Efficient Isolated/ Nonisolated 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
  • 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

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Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.

 

Parametrics

Input Type Vin(Min) Vin(Max) Iout(Max) Single/Multiple Output Vout(V) Pout(W) Isolated/Non-Isolated Topology
AC 176 284 1.5 - 5 7.5 Isolated Flyback

Parametrics

Input Type AC
Vin(Min) 176
Vin(Max) 284
Iout(Max) 1.5
Single/Multiple Output -
Vout(V) 5
Pout(W) 7.5
Isolated/Non-Isolated Isolated
Topology Flyback

Maxim Devices (2)

Part Number Name Product Family Order Design kits and evaluation modules
MAX17595 Peak-Current-Mode Controllers for Flyback and Boost Regulators Isolated Power Buy Now Design Kits
MAX17606 Secondary-Side Synchronous MOSFET Driver for Flyback Converters Isolated Power Buy Now Design Kits

Maxim Devices (2)

Part Number Product Family
Isolated Power
Peak-Current-Mode Controllers for Flyback and Boost Regulators
Isolated Power
Secondary-Side Synchronous MOSFET Driver for Flyback Converters

Design Files (4)

Title Type Size Date
maxrefdes1187_bom PDF 114KB 2019-07-09
maxrefdes1187_schematic PDF 70KB 2019-07-09
MAXREFDES1187 - 7.5W 5V Offline Flyback Converter Using the MAX17595 PDF 541KB 2019-07-09
maxrefdes1187_pcb PDF 1MB 2019-07-09
Date Type
2019-07-09

maxrefdes1187_bom

(PDF, 114KB)

2019-07-09

maxrefdes1187_schematic

(PDF, 70KB)

2019-07-09

MAXREFDES1187 - 7.5W 5V Offline Flyback Converter Using the MAX17595

(PDF, 541KB)

2019-07-09

maxrefdes1187_pcb

(PDF, 1MB)

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