illustrate

The UC28023 and UC28025 are optimized controllers for PWM high-frequency switch-mode power supply applications with fixed frequency. The UC28023 is a single-ended topology UC28025 while providing dual alternating double-ended outputs and a single output in a full-bridge topology.

Designed as a cost-effective solution with minimal external components, the UC2802x includes an oscillator, temperature compensation reference, wide-band width error amplifier, a high-speed current-sense comparator and high-current high-efficiency totem pole output, directly driving an external MOSFET.

The protection circuitry includes a threshold current limit comparator with 1 - V, compatible with TTL shut-off ports, and a soft-start pin that will double the maximum duty cycle clamp.

characteristic

• Peak current mode, average current mode, or voltage mode
  (with feedforward) control method
• Actual operation up to 1 MHz
• 50 - ns propagation delay to the output
• ± 1.5 peak totem pole output
• 9 V to 30 V rated operating voltage range
• Wideband error amplifier
• Fully locked logic dual-pulse suppression
• The pulse is limited by the pulse current
• Programmable maximum duty cycle control
• Undervoltage lockout and hysteresis
• Edge 5.1 - V with UVLO reference
• Same features as UC3823 and UC3825
• apply
  • Offline and DC/DC power supplies
  • The converter adopts voltage mode, peak current mode,
    or average current mode control method
  • Single-ended or double-switch topology design