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.
The MC34023 series are integrated circuits optimized for high frequency operation in Off-Line and DC-to-DC converter applications. They feature an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, and a high speed current sensing comparator ideally suited for driving a power MOSFET.
| Reference Output Voltage (Typ) | 5.1 V |
|---|---|
| Maximum Duty Cycle | 90% |
| Operating Junction Temperature (MC34023) | +150 °C |
| Output Current, Source or Sink | 0.5 A |
It takes between 30 ns and 60 ns for the output voltage to rise or fall.
The typical start-up current is 5 mA at a supply voltage of 8.0 V.