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UC3843D8 The Unitrode UC3843D8 is a current mode PWM controller designed for AC/DC and DC-to-DC converters. It operates at up to 500kHz with a 100% maximum duty cycle.
Mfr Part #:

UC3843D8

Available from 1 distributors
Mfr Name: Unitrode
Unitrode
The Unitrode UC3843D8 is a current mode PWM controller designed for AC/DC and DC-to-DC converters. It operates at up to 500kHz with a 100% maximum duty cycle.
✓ Total Stock: 13 pcs
$ Price Range: $1.92

UC3843D8 Available from 1 distributor

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✓ Non-Authorised
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UC3843D8 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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UC3843D8 Description

Short technical summary and product information.

The UC3843D8 from Unitrode is a versatile single-ended current mode PWM controller optimized for offline and DC-to-DC converters. It features a maximum switching frequency of 500kHz and a maximum duty cycle of 100%, making it suitable for a wide range of power supply designs.

 

Key electrical characteristics include peak current mode control, adjustable switching frequency, and pulse-by-pulse current limiting. It also incorporates features like undervoltage lockout with hysteresis, double-pulse suppression, and a high-current totem-pole output. The controller requires a low start-up current of less than 1mA and offers automatic feedforward compensation for enhanced performance.

 

Available in SOIC (D) and PDIP (P) packages, the UC3843D8 is designed for surface mount or through-hole applications. Its robust design and comprehensive feature set make it a reliable choice for power management solutions requiring efficient and stable voltage regulation.

UC3843D8 Quick Information

Product Type: Current Mode PWM Controller
Canonical Name: UC3843D8 Current Mode PWM Controller
Subcategory: PWM Controllers

UC3843D8 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

UC3843D8 Estimated Pricing

Qty Low High
1+ $1.92 $1.92

Estimated market price range - modelled values for guidance only, not live distributor offers.

UC3843D8 Features

  • Peak current mode PWM controller
  • Up to 500kHz switching frequency
  • 100% maximum duty cycle
  • Low start-up current (<1mA)
  • Available in SOIC and PDIP packages

UC3843D8 Applications

  • Optimized for DC-to-DC converters
  • Suitable for offline power supplies
  • Used in boost converter designs
  • Used in buck converter designs
  • Used in flyback converter designs

UC3843D8 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the maximum switching frequency of the UC3843D8?

The maximum switching frequency is 500kHz.

What is the maximum duty cycle for the UC3843D8?

The maximum duty cycle is 100%.

What control mode does the UC3843D8 use?

The UC3843D8 uses peak current mode control.

What are the undervoltage lockout (UVLO) levels for the UC3843D8?

The UVLO levels are 8.4V/7.6V.

What is the start-up current for the UC3843D8?

The start-up current is less than 1mA.

What power supply topologies can the UC3843D8 be used in?

The UC3843D8 can be used in Boost, Buck, Buck boost, Flyback, and Forward topologies.

What package types are available for the UC3843D8?

The UC3843D8 is available in SOIC (D) and PDIP (P) packages.

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