The MC34025 series are high speed, fixed frequency, double−ended pulse width modulator controllers optimized for high frequency operation. They are specificallydesigned 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 Startup Current (500 A 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
●•Pb−Free Packages are Available
