The MAX15000AEUB+ from Maxim Integrated Products is a current-mode PWM controller with programmable switching frequency in 10 pin µMAX package. It contains an internal error amplifier that regulates the tertiary winding output voltage which is used in primary-side-regulated isolated power supplies. Primary-side regulation eliminates the need for an optocoupler. An input undervoltage lockout is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. An open-drain UVLO flag output with 210µs internal delay, allows the sequencing of a secondary-side controller. The input-supply start voltage is externally programmable with a voltage-divider. A UVLO/EN input is used to shutdown the MAX15000. The MAX15000 has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for start-up.
Universal offline input voltage range from 85VAC to 265VAC
Current mode control
Programmable switching frequency up to 625KHz
Internal error amplifier with 1.5% accurate reference
50µA (typ) start-up supply current
50% maximum duty-cycle limit
60ns cycle by cycle current-limit propagation delay
Switching frequency for the MAX15000 is programmable with an external resistor
