Output voltage regulation of ±8% can be attained without the use of an opto-coupler. When an opto-coupler is used, ±1.5% regulation can be realised. A programmable volt-second clamp provides a safeguard for transformer reset that prevents saturation and protects the MOSFET. This function optimises the transformer and MOSFET, reducing solution size.
The LT8310 computes the duty cycle required to create a constant VOUT in open loop applications, thereby simplifying the design. In closed loop applications, the LT8310 limits maximum VOUT if the opto-coupler path breaks open.
Features include programmable overcurrent protection, adjustable input undervoltage, overvoltage lockout and built-in thermal shutdown. The LT8310 has a programmable 100 kHz to 500 kHz operating switching frequency and can be synchronised to an external clock, enabling the use of a wide range of output inductor values and transformer sizes.
It comes in a TSSOP-20 package with several pins removed for high voltage spacing, in E- and I-grade (-40°C to 125°C junction temperature), H grade (-40°C to 150°C) and MP grade (-55°C to 150°C). Pricing starts at $2.99 (1000).
Linear Technology; www.linear.com/product/LT8310