Analog Devices MAX17690

Description

The MAX17690 is a peak current mode, fixed-frequencyswitching controller specifically designed for the isolatedflyback topology operating in Discontinuous ConductionMode (DCM). The device senses the isolated outputvoltage directly from the primary-side flyback waveformduring the off-time of the primary switch. No auxiliary windingor optocoupler is required for output voltage regulation.The MAX17690 is designed to operate over a widesupply range from 4.5V to 60V. The switching frequency isprogrammable from 50kHz to 250kHz. A EN/UVLO pinallows the user to turn on/off the power supply precisely atthe desired input voltage. The MAX17690 provides an inputovervoltage protection through the OVI pin. The 7V internalLDO output of the MAX17690 makes it suitable for switchingboth logic-level and standard MOSFETs used in flybackconverters. With 2A/4A source/sink currents, the MAX17690is ideal for driving low RDS(ON) power MOSFETs with fastgate transition times. The MAX17690 provides an adjustablesoft-start feature to limit the inrush current during startup.The MAX17690 provides temperature compensation forthe output diode forward voltage drop. The MAX17690 hasrobust hiccup-protection and thermal protection schemes,and is available in a space-saving 16-pin 3mm x 3mmTQFN package with a temperature range from -40°C to 125°C.

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

Typical applications

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

More information

• Datasheet
• IC product information