●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
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● 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
