UC3843A

ACTIVE

30-V, 1A, 500KHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle 0°C to 70°C

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Product details

Parameters

Topology Boost, Buck, Flyback, Forward Control method Current VCC (Min) (V) 8.4 VCC (Max) (V) 28 Duty cycle (Max) (%) 100 UVLO thresholds on/off (V) 8.4/7.6 Frequency (Max) (kHz) 500 Operating temperature range (C) 0 to 70 Gate drive (Typ) (A) 1 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 14 52 mm² 8.65 x 6 SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new Find other PWM controllers & resonant controllers

Features

  • Optimized for Off-Line and DC-DC Converters
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feedforward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout With Hysteresis
  • Double Pulse Suppression
  • High-Current Totem Pole Output
  • Internally-Trimmed Bandgap Reference
  • Up to 500-kHz Operation
  • Create a Custom Design Using the UCx84xA With the WEBENCH® Power Designer

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Description

The UCx84xA family of control devices is a pin-for-pin compatible improved version of the UCx84x family. Providing the necessary features to control current-mode or switched-mode power supplies, this family of devices has many improved features: startup current is less than 0.5 mA, oscillator discharge is trimmed to 8.3 mA, and during UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SLUM033.ZIP (101 KB) - PSpice Model
SIMULATION MODELS Download
SLUM521.ZIP (4 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
PDIP (P) 8 View options
SOIC (D) 14 View options
SOIC (D) 8 View options

Ordering & quality

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