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TL3843
  • TL3843
  • TL3843
  • TL3843

TL3843

ACTIVE

Economy single ended 500KHz current mode PWM controller with 8.4V/7.6V UVLO 100% duty cycle, 0-70C

Texas Instruments TL3843 Product Info

1 April 2026 0

Parameters

Topology

Boost, Flyback

Control mode

Current

Features

Adjustable switching frequency, Current limiting, Error amplifier, Fixed frequency, Multi-topology

Duty cycle (max) (%)

100

Package

PDIP (P)-8-92.5083 mm² 9.81 x 9.43

Features

  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feed-forward 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
  • 500kHz operation
  • Error amplifier with low output resistance
  • Designed to be interchangeable with UC2842 and UC3842 series
  • Optimized for off-line and DC-to-DC converters
  • Low start-up current (< 1mA)
  • Automatic feed-forward 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
  • 500kHz operation
  • Error amplifier with low output resistance
  • Designed to be interchangeable with UC2842 and UC3842 series

Description

The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.

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