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The MC34025 series are high speed, fixed frequency, double-ended pulse width modulator controllers optimized for high frequency operation. They are specifically designed for Off-Line and DC-to-DC converter applications offering the designer a cost effective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high speed current sensing comparator, steering flip-flop, and dual high current totem pole outputs ideally suited for driving power MOSFETs.

Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering.

The flexibility of this series allows it to be easily configured for either current mode or voltage mode control.

Features
50 ns Propagation Delay to Outputs
Dual High Current Totem Pole Outputs
Wide Bandwidth Error Amplifier
Fully-Latched Logic with Double Pulse Suppression
Latching PWM for Cycle-By-Cycle Current Limiting
Soft-Start Control with Latched Overcurrent Reset
Input Undervoltage Lockout with Hysteresis
Low Start-Up Current (500 mA Typ)
Internally Trimmed Reference with Undervoltage Lockout
45% Maximum Duty Cycle (Externally Adjustable)
Precision Trimmed Oscillator
Voltage or Current Mode Operation to 1.0 MHz
Functionally Similar to the UC3825 Simplified
Pb-Free Packages are Available