UC28025

ACTIVE

Double ended economy high speed PWM controller

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Product details

Parameters

Topology Boost, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Control method Current, Feedforward, Voltage VCC (Min) (V) 9.2 VCC (Max) (V) 12 Duty cycle (Max) (%) 45 UVLO thresholds on/off (V) 9.2/8.4 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 105 Gate drive (Typ) (A) 1.5 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Multi-topology, Programmable Max Duty Cycle, Soft Start, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other PWM controllers & resonant controllers

Features

  • 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
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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 current-sense 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 logic circuitry have been minimized while maximizing bandwidth and slew rate of the error amplifier.

Devices are available in the industrial temperature range of –40°C to 105°C. Package offerings are 16-pin SOIC (DW), or 16-pin PDIP (N) packages.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 3
Type Title Date
* Datasheet UC2802x Economy High-Speed PWM Controller datasheet (Rev. G) Dec. 09, 2016
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application notes U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply Sep. 05, 1999

Design & development

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Design tools & simulation

SIMULATION MODELS Download
SLUM131.ZIP (93 KB) - PSpice Model
SIMULATION MODELS Download
SLUM259.TSC (1635 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLUM260.ZIP (15 KB) - TINA-TI Spice Model
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CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SOIC (DW) 16 View options

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