www.DataSheet4U.com
19-3957; Rev 0; 1/06
Current-Mode PWM Controllers with Programmable Switching Frequency
General De...
www.DataSheet4U.com
19-3957; Rev 0; 1/06
Current-Mode PWM Controllers with Programmable Switching Frequency
General Description
The MAX15000/MAX15001 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-
voltage isolated and nonisolated power supplies. The MAX15000 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX15001 is well suited for low input
voltage (9.5VDC to 24VDC) power supplies. The MAX15000/MAX15001 contain 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 under
voltage lockout (UVLO) 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/ MAX15001. Internal digital soft-start eliminates output
voltage overshoot. The MAX15000 has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for startup. The MAX15001 does not have the internal bootstrap UVLO and can be biased directly from a minimum
voltage of 9.5V. The switching frequency for the MAX15000/MAX15001 is pro...