NCP1282BDR2G

Product Summary

The NCP1282BDR2G is a voltage mode controller designed for ac-dc or dc-dc converters requiring high-efficiency and low parts count. This controller NCP1282BDR2G incorporates two in phase outputs with an overlap delay to prevent simultaneous conduction and facilitates soft switching. The main output is designed for driving a forward converter primary MOSFET. The secondary output is designed for driving an active clamp circuit MOSFET, a synchronous rectifier on the secondary side, or an asymmetric half bridge circuit. The typical applications of the NCP1282BDR2G include High Power Consumer Electronics, High Power AC-DC Converters and High Power DC-DC Converters and ATX Power Supplies.

Parametrics

NCP1282BDR2G absolute maximum ratings: (1)Line Voltage, Vin: 500 V; (2)Auxiliary Supply, OUT1, OUT2, VAUX, Voutx: 20 V; (3)All Other Inputs/Outputs Voltage, VIO: 10 V; (4)All Other Inputs/Outputs Current, IIO: 5.0 mA; (5)5.0 V Reference Output Current, IREF: 10 mA; (6)5.0 V Reference Output Voltage, VREF: -0.3 to 6.0 V; (7)OUT1 Peak Output Current (D = 2%), Iout1: 2.5 A; (8)OUT2 Peak Output Current (D = 2%), Iout2: 1.0 A; (9)Operating Junction Temperature, TJ: –40 to +125℃; (10)Storage Temperature Range, Tstg: –55 to +150℃; (11)Power Dissipation, PD: 0.95W; (12)Thermal Resistance, Junction to Ambient, RθJA: 120℃/W.

Features

NCP1282BDR2G features: (1)Dual Control Outputs with Adjustable Overlap Delay; (2)>2.0 A Output Drive Capability; (3)Soft-Stop Powers Down Converter in a Controlled Manner; (4)Cycle-by-Cycle Current Limit; (5)Cycle Skip Initiated if Continuous Current Limit Condition Exists; (6)Voltage Mode Operation with Input Voltage Feedforward; (7)Fixed Frequency Operation up to 1.0 MHz; (8)Bidirectional Frequency Synchronization; (9)Independent Line Undervoltage and Overvoltage Detectors; (10)Minimum Operating Voltage of 8.5 V Ensures Enough Voltage is Available for Driving High Voltage MOSFETs; (11)Accurate Programmable Maximum Duty Cycle Limit; (12)Programmable Maximum Volt-Second Product; (13)Programmable Soft-Start; (14)Internal 500 V Startup Circuit; (15)Precision 5.0 V Reference; (16)This is a Pb-Free Device.

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