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UC28023

Texas Instruments
Part Number UC28023
Manufacturer Texas Instruments
Description Economy High-Speed PWM Controller
Published Apr 18, 2020
Detailed Description Product Folder Sample & Buy Technical Documents Tools & Software Support & Community UC28023, UC28025 SLUS557G – MA...
Datasheet PDF File UC28023 PDF File

UC28023
UC28023

Overview
Product Folder Sample & Buy Technical Documents Tools & Software Support & Community UC28023, UC28025 SLUS557G – MARCH 2003 – REVISED DECEMBER 2016 UC2802x Economy High-Speed PWM Controller 1 Features •1 Peak Current Mode, Average Current Mode, or Voltage Mode (With FeedForward) 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 • Wide Bandwidth Error Amplifier • Fully Latched Logic With Double Pulse Suppression • Pulse-by-Pulse Current Limiting • Programmable Maximum Duty Cycle Control • Undervoltage Lockout With Hysteresis • Trimmed 5.
1-V Reference With UVLO • Same Functionality as UC3823 and UC3825 2 Applications • Off-Line and DC-DC Power Supplies • Converters Using Voltage Mode, Peak Current Mode, or Average Current Mode Control Methods • Single-Ended or Two-Switch Topology Designs 3 Description 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.
Targeted for cost-effective solutions with minimal external components.
UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high-speed currentsense comparator, and high-current, active-high, totem-pole outputs to directly drive external MOSFETs.
Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles as a maximum duty-cycle clamp.
The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output.
An undervoltage lockout section with 800 mV of hysteresis assures low start-up current.
During undervoltage lockout, the outputs are high impedance.
Propagation delays through the comparators and l...


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