LM5005

LM5005 High Voltage 2.5 Amp Buck Regulator March 2006 LM5005 High Voltage 2.5 Amp Buck Regulator General Description The LM5005 high voltage switching regulator features all of the functions necessary to implement an efficient high voltage buck regulator using a minimum of external components. This easy to use regulator includes a 75V N-Channel buck switch with an output current capability of 2.5 Amps. The regulator control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50kHz to 500kHz. An oscillator synchronization pin allows multiple LM5005 regulators to selfsynchronize or to be synchronized to an external clock. Additional protection features include: current limit, thermal shutdown and remote shutdown capability. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation. Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Integrated 75V, 2.5A N-Channel Buck Switch Ultra-wide input voltage range from 7V to 75V Internal high voltage bias regulator Adjustable output voltage from 1.225V 1.5% feedback reference accuracy Current mode contro...