UC28025NG4

开关控制器 Regulating Pulse Width Modulator

DESCRIPON

The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power supply applications. 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.

FEATURES

Peak Current Mode, Average Current Mode, or Voltage Mode with Feed-Forward Control Methods

Practical Operation Up to 1 MHz

50-ns Propagation Delay to Output

±1.5-A Peak Totem Pole Outputs

9-V to 30-V Nominal Operational Voltage Range

Wide Bandwidth Error Amplifier

Fully Latched Logic with Double Pulse Suppression

Pulse-by-Pulse Current Limiting

Programmable Maximum Duty Cycle Control

Under--Voltage Lockout with Hysteresis

Trimmed 5.1-V Reference with UVLO

Same Functionality as UC3823 and UC3825