MC34023P

The MC34023P from ON Semiconductor is a high-speed, fixed-frequency, single-ended pulse width modulator (PWM) controller. It is optimized for high-frequency operation and is suitable for off-line and DC-to-DC converter applications, offering a cost-effective solution with minimal external components.

Key electrical specifications include an operating supply voltage range of 8.4V to 30V, a nominal frequency of 1MHz, and a maximum duty cycle of 90%. It features a wide bandwidth error amplifier, a high-speed current sensing comparator, and a high current totem pole output. Protective features include input and reference undervoltage lockouts, cycle-by-cycle current limiting, and a latch for single pulse metering. The device can be configured for either current mode or voltage mode control.

This controller is housed in a 16-DIP (0.300", 7.62mm) through-hole package and operates within an ambient temperature range of 0°C to 70°C. It is designed for applications requiring precise control and protection, such as AC/DC adaptors and chargers for various electronic devices.

Additional features include soft-start control with latched overcurrent reset, internally trimmed reference with undervoltage lockout, and a low startup current. The device is functionally similar to the UC3823.