资 源 简 介
The LM5025 PWM controller contains all of the featuresnecessary to implement power converters uTIlizing the AcTIveClamp / Reset technique. The device can be configured tocontrol either a P-Channel clamp switch or an N-Channelclamp switch. With the acTIve clamp technique, higher efficienciesand greater power densiTIes can be realized comparedto conventional catch winding or RDC clamp / resettechniques. Two control outputs are provided, the mainpower switch control (OUT_A) and the active clamp switchcontrol (OUT_B). The active clamp output can be configuredfor either a guaranteed overlap time (for P-Channel switchapplications) or a guaranteed deadtime (for N_Channel applications).The two internal compound gate drivers parallelboth MOS and Bipolar devices, providing superior gate drivecharacteristics. This controller is designed for high-speedoperation including an oscillator frequency range up to 1MHzand total PWM and current sense propagation delays lessthan 100ns. The LM5025 includes a high-voltage start-upregulator that operates over a wide input range of 13V to90V. Additional features include: Line Under Voltage Lockout(UVLO), softstart, oscillator UP/DOWN sync capability, precisionreference and thermal shutdown.
