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60V, No-Opto Isolated Flyback Controller

Compact, Cost-Effective, and Easy-to-Implement Isolated DC-DC Controller

Product Details

Key Features

Applications/Uses

Parametric specs for Powered Devices
Compliance IEEE 802.3af
IEEE 802.3at
IEEE 802.3bt
PWM Yes
Switching Frequency (kHz) 50-250
Package/Pins TQFN-CU/16
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
3.14
Parametric specs for Isolated Power Supplies
VIN (V) (min) 4.5
VIN (V) (max) 60
Topology Flyback
Application (VIN) Base Station (24V)
Industrial (24V)
Networking (48V)
Switch Type External
Control Loop Current Mode
Feedback Primary Side
Switching Frequency (kHz) 250
Duty Cycle (%) (max) 69
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
3.14
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Simplified Block Diagram

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Parameters

Parametric specs for Powered Devices
Compliance IEEE 802.3af
IEEE 802.3at
IEEE 802.3bt
PWM Yes
Switching Frequency (kHz) 50-250
Package/Pins TQFN-CU/16
Oper. Temp. (°C) -40 to +125
Budgetary
Price (See Notes)
3.14
Parametric specs for Isolated Power Supplies
VIN (V) (min) 4.5
VIN (V) (max) 60
Topology Flyback
Application (VIN) Base Station (24V)
Industrial (24V)
Networking (48V)
Switch Type External
Control Loop Current Mode
Feedback Primary Side
Switching Frequency (kHz) 250
Duty Cycle (%) (max) 69
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/16
Budgetary
Price (See Notes)
3.14

Key Features

  • 4.5V to 60V Input Voltage Range
  • No Optocoupler or Third Winding Required to Derive Feedback Signal Across Isolation Boundary
  • 2A/4A Peak Source/Sink Gate Drive Currents
  • 50kHz to 250kHz Programmable Switching Frequency
  • Input EN/UVLO Feature
  • Input Overvoltage Protection
  • Programmable Soft-Start
  • Hiccup-Mode Short-Circuit Protection
  • Thermal Shutdown Protection
  • -40°C to 125°C Operating Temperature Range
  • Space-Saving, 16-Pin 3 x 3 TQFN Package

Applications/Uses

  • Industrial and Telecom Applications
  • Isolated Flyback Converters
  • PLC I/O Modules
  • Wide-Range DC-Input Isolated Power Supplies

Description

MAX17690 Samples

The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed for the isolated flyback topology operating in Discontinuous Conduction Mode (DCM). The device senses the isolated output voltage directly from the primary-side flyback waveform during the off-time of the primary switch. No auxiliary winding or optocoupler is required for output voltage regulation.

The MAX17690 is designed to operate over a wide supply range from 4.5V to 60V. The switching frequency is programmable from 50kHz to 250kHz. A EN/UVLO pin allows the user to turn on/off the power supply precisely at the desired input voltage. The MAX17690 provides an input overvoltage protection through the OVI pin. The 7V internal LDO output of the MAX17690 makes it suitable for switching both logic-level and standard MOSFETs used in flyback converters. With 2A/4A source/sink currents, the MAX17690 is ideal for driving low RDS(ON) power MOSFETs with fast gate transition times. The MAX17690 provides an adjustable soft-start feature to limit the inrush current during startup.

The MAX17690 provides temperature compensation for the output diode forward voltage drop. The MAX17690 has robust hiccup-protection and thermal protection schemes, and is available in a space-saving 16-pin 3mm x 3mm TQFN package with a temperature range from -40°C to 125°C.


Get Started with No-Opto Flyback Technology and the MAX17690

Simplified Block Diagram

MAX17690: Application Circuit MAX17690: Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .