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UC2841

Unitrode
Part Number UC2841
Manufacturer Unitrode
Description Programmable Off-Line PWM Controller
Published Oct 16, 2019
Detailed Description Programmable, Off-Line, PWM Controller UC1841 UC2841 UC3841 FEATURES • All Control, Driving, Monitoring, and Protectio...
Datasheet PDF File UC2841 PDF File

UC2841
UC2841

Overview
Programmable, Off-Line, PWM Controller UC1841 UC2841 UC3841 FEATURES • All Control, Driving, Monitoring, and Protection Functions Included DESCRIPTION The UC1841 family of PWM controllers has been designed to increase the level of versatility while retaining all of the performance features of • Low-current, Off-line Start Circuit • Voltage Feed Forward or Current Mode Control the earlier UC1840 devices.
While still optimized for highly-efficient bootstrapped 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 • Guaranteed Duty Cycle Clamp low-current starting circuit, linear feed-forward for constant volt-second operation, and compatibility with either voltage or current mode topologies.
• PWM Latch for Single Pulse per Period In addition to start-up and normal regulating PWM functions, these de- • Pulse-by-Pulse Current Limiting Plus vices include built in protection from over-voltage, under-voltage, and Shutdown for Over-Current Fault over-current fault conditions with the option for either latch-off or automat- • No Start-up or Shutdown Transients • Slow Turn-on Both Initially and After Fault Shutdown • Shutdown Upon Over- or Under-Voltage Sensing ic 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.
• Latch Off or Continuous Retry After Fault 2.
The External Stop input can be used for a fault delay to resist shutdown from short duration transients.
• PWM Output Switch Usable to 1A Peak Current 3.
The duty-cycle clamping function has been characterized and specified.
• 1% Reference Accuracy The UC1841 is characterized for -55°C to +125°C operation while the • 500k...


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