LM5015 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – High Voltage Monolithic Two-Switch Forward DC-DC Regulator

December 10, 2007
LM5015
High Voltage Monolithic Two-Switch Forward DC-DC
Regulator
General Description
The LM5015 high voltage switch mode regulator features all
the functions necessary to implement efficient high voltage
Two-Switch Forward and Two-Switch Flyback regulators, us-
ing a minimum of external components. This easy to use
regulator integrates high side and low side 75 Volt N-Channel
MOSFETs with a minimum 1 Amp peak current limit. The
voltage across the MOSFETs employed in the two-switch
topology is clamped to the input voltage, allowing the input
voltage range to approach the rating of the MOSFETs. The
regulator control method is based on current mode control
providing inherent ease of loop compensation and line feed-
forward for superior rejection of input transients.
The operating frequency is set with a single resistor and is
programmable up to 750 kHz. The oscillator can also be syn-
chronized to an external clock. Additional protection features
include cycle-by-cycle current limiting, thermal shutdown, un-
der-voltage lockout and remote shutdown capability. The de-
vice is available in the TSSOP-14EP package featuring an
exposed die attach pad to enhance thermal dissipation.
Features
■ ^{Dual Integrated 75V N-Channel MOSFETs}
■ ^{Ultra-wide input voltage range: 4.25V to 75V}
■ ^{Integrated high voltage bias regulator}
■ ^{Adjustable output voltage}
■ ^{1.5% feedback reference accuracy}
■ ^{Current mode control with selectable compensation}
■ ^{Wide bandwidth error amplifier}
■ ^{Integrated current sensing and limiting}
■ ^{50% maximum duty cycle limit}
■ ^{Single resistor oscillator programming}
■ ^{Oscillator synchronization capability}
■ ^{Programmable soft-start}
■ ^{Enable / Under-voltage Lockout (UVLO) pin}
■ ^{Thermal shutdown}
Package
■ ^{TSSOP-14EP (Exposed Pad)}
Typical Application Schematic
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