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 MAX15000AEUB+ has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for start-up.
Feature
- 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
- Operating temperature range from -40°C to 85°C
Applications
- 1/2, 1/4, and 1/8th Brick Power Modules
- 12V Boost and SEPIC Regulators
- High-Efficiency, Isolated Telecom Power Supplies
- Industrial Power Conversion
- Isolated and Nonisolated High-Brightness LED Power Supplies
- Isolated Keep-Alive Power Supplies
- Networking/Server
