Product Description
The MC34023 series are high speed, fixed frequency, single-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, and a high current totem pole output ideally suited for driving a power MOSFET.
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.
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Features |
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50 ns Propagation Delay to Output
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High Current Totem Pole Output
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Wide Bandwidth Error Amplifier
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Fully-Latched Logic with Double Pulse Suppression
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Latching PWM for Cycle-By-Cycle Current Limiting
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Soft-Start Control with Latched Overcurrent Reset
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Input Undervoltage Lockout with Hysteresis
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Low Start-Up Current (500 µA Typ)
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Internally Trimmed Reference with Undervoltage Lockout
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90% Maximum Duty Cycle (Externally Adjustable)
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Precision Trimmed Oscillator
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Voltage or Current Mode Operation to 1.0 MHz
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Functionally Similar to the UC3823
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Pb-Free Packages are Available
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