MAX17690 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – 4.5V to 60V Input Voltage Range

MAX17690
EVALUATION KIT AVAILABLE
60V, No-Opto Isolated Flyback Controller
General Description
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 R_DS(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.
Application Circuit
Benefits and 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
●● Isolated Flyback Converters
●● Wide-Range DC-Input Isolated Power Supplies
●● Industrial and Telecom Applications
●● PLC I/O modules
Ordering Information appears at end of data sheet.
19-7970; Rev 1; 12/16