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Product details

Parameters

Topology Boost, Buck, Buck-Boost, Flyback, Forward Control method Peak Current Mode VCC (Min) (V) 8 VCC (Max) (V) 32 Duty cycle (Max) (%) 95 UVLO thresholds on/off (V) 8/7.8 Frequency (Max) (kHz) 500 Operating temperature range (C) -20 to 85 Gate drive (Typ) (A) 1 Features Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

PDIP (N) 18 211 mm² 22.48 x 9.4 SOIC (DW) 18 119 mm² 11.55 x 10.3 open-in-new Find other PWM controllers & resonant controllers

Features

  • All Control, Driving, Monitoring, and Protection Functions Included
  • Low-current, Off-line Start Circuit
  • Voltage Feed Forward or Current Mode Control
  • Guaranteed Duty Cycle Clamp
  • PWM Latch for Single Pulse per Period
  • Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fault
  • No Start-up or Shutdown Transients
  • Slow Turn-on Both Initially and After Fault Shutdown
  • Shutdown Upon Over- or Under-Voltage Sensing
  • Latch Off or Continuous Retry After Fault
  • PWM Output Switch Usable to 1A Peak Current
  • 1% Reference Accuracy
  • 500kHz Operation
  • 18 Pin DIL Package
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Description

The UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of the earlier UC1840 devices. While still optimized for highly-efficient boot-strapped primary-side operation in forward or flyback power converters, the UC1841 is equally adept in implementing both low and high voltage input DC to DC converters. Important performance features include a low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.

In addition to start-up and normal regulating PWM functions, these devices include built in protection from over-voltage, under-voltage, and over-current fault conditions with the option for either latch-off or automatic restart.

While pin compatible with the UC1840 in all respects except that the polarity of the External Stop has been reversed, the UC1841 offers the following improvements:

1. Fault latch reset is accomplished with slow start discharge rather than recycling the input voltage to the chip.

2. The External Stop input can be used for a fault delay to resist shutdown from short duration transients.

3. The duty-cycle clamping function has been characterized and specified.

The UC1841 is characterized for -55°C to +125°C operation while the UC2841 and UC3841 are designed for -25°C to +85°C and 0°to +70°C, respectively.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet Programmable, Off-Line, PWM Controller datasheet Sep. 05, 1999
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note DN-28 UC3840/UC3841/UC3851 PWM Controllers - Summary of Functions & Differences Sep. 05, 1999

Design & development

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CAD/CAE symbols

Package Pins Download
PDIP (N) 18 View options
SOIC (DW) 18 View options

Ordering & quality

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