MAX5074

19-3312; Rev 0; 7/04 T AVAILABLE EVALUATION KI www.DataSheet4U.com Power IC with Integrated MOSFETs for Isolated IEEE 802.3af PD and Telecom Power-Supply Applications General Description The MAX5074 isolated PWM power IC features integrated switching power MOSFETs connected in a voltageclamped, two-transistor, power-circuit configuration. This device can be used in both forward and flyback configurations with a wide input voltage range from 11V to 76V and up to 15W of output power. The voltage-clamped power topology enables full recovery of stored magnetizing and leakage inductive energy for enhanced efficiency and reliability. A lookahead signal for driving secondary-side synchronous rectifiers can be used to increase efficiency. A wide array of protection features includes UVLO, overtemperature shutdown, and short-circuit protection with hiccup current limit for enhanced performance and reliability. Operation up to 500kHz allows smaller external magnetics and capacitors. The MAX5074 is rated for operation over the -40°C to +125°C temperature range and is available in a 20-pin TSSOP package. Warning: The MAX5074 is designed to work with high voltages. Exercise caution. ♦ No Reset Winding Required ♦ Up to 15W Output Power ♦ Bias Voltage Regulator with Automatic HighVoltage Supply Turn-Off ♦ 11V to 76V Wide Input Voltage Range ♦ Integrated High-Voltage 0.4Ω Power MOSFETs ♦ Feed-Forward Voltage-Mode Control For Fast Input Transient Rejection ♦ Programmable Brownout Undervolta...