Introduces the UC28023 and UC28025, two fixed frequency PWM controllers optimized for high-frequency switched-mode power supply applications, including product features, application scenarios, and working principles
The UC28023 and UC28025 are fixed-frequency PWM controllers designed for high-frequency switched-mode power supply applications. The UC28023 is intended for single output PWM in single-ended topologies, while the UC28025 provides dual alternating outputs suitable for double-ended and full bridge topologies. These devices target cost-effective solutions with minimal external components, integrating an oscillator, temperature-compensated reference, wide bandwidth error amplifier, and high-speed current-sense comparator.
| Reference Voltage (Typ) | 5.1 V |
|---|---|
| Oscillator Frequency (Typ) | 400 kHz |
| Unity Gain Bandwidth | 3.0 to 5.5 MHz |
| Maximum Duty Cycle (UC28023) | 80% |
| Maximum Duty Cycle (UC28025) | 40% |
| Current Limit Threshold Voltage | 1.0 V |
| Operating Junction Temperature Range | -55 to 150 °C |
| Package Types | 16-pin SOICW (DW), 16-pin PDIP (N) |
The UC28023 is a single output PWM for single-ended topologies, while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.
The typical reference voltage is 5.1 V, with a range from 5.05 V to 5.15 V.
The maximum duty cycle for the UC28025 is 40%.