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UC3843A The STMicroelectronics UC3843A is a current mode PWM controller designed for off-line and DC-DC converters. It operates up to 500kHz with a 1A output current and 30V output voltage.
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UC3843A

Available from 1 distributors
Mfr Name: STMicroelectronics
STMicroelectronics
The STMicroelectronics UC3843A is a current mode PWM controller designed for off-line and DC-DC converters. It operates up to 500kHz with a 1A output current and 30V output voltage.
✓ Total Stock: 50 pcs
$ Price Range: $1.92

UC3843A Available from 1 distributor

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Hybrid Electronics ✓
Non-Authorised Inventory information
50 pcs
On Request
50 pcs On Request 1 On Request On Request 98 On Request On Request
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UC3843A Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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Automotive Grade
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Industrial Grade
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UC3843A Description

Short technical summary and product information.

The UC3843A from STMicroelectronics is a high-performance current mode PWM controller optimized for off-line and DC-DC converter applications. It features an adjustable switching frequency up to 500kHz and a maximum duty cycle of 100%.

 

Key electrical characteristics include a 30V output voltage capability and 1A output current. The device incorporates features such as current limiting, dead time control, and an error amplifier for precise regulation. It also includes undervoltage lockout (UVLO) with hysteresis, ensuring reliable operation.

 

Designed for ease of use, the UC3843A offers low start-up current (< 0.5mA) and a trimmed oscillator discharge current. It is available in PDIP and SOIC packages, suitable for through-hole mounting.

 

This PWM controller is well-suited for various power supply designs requiring efficient and stable voltage regulation.

UC3843A Quick Information

Product Type: Current Mode PWM Controller
Series: UCx84xA
Canonical Name: UC3843A Current Mode PWM Controller
Subcategory: PWM Controller

UC3843A Compliance

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

UC3843A Estimated Pricing

Qty Low High
1+ $1.92 $1.92

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

UC3843A Features

  • Current mode PWM controller
  • Up to 500kHz switching frequency
  • 1A output current, 30V output voltage
  • 100% maximum duty cycle
  • Low start-up current < 0.5mA

UC3843A Applications

  • Optimized for off-line converters
  • Suitable for DC-DC converters
  • Used in power supply designs
  • Enables efficient voltage regulation

UC3843A FAQs

5 frequently asked questions generated from this part’s specifications.
What is the maximum switching frequency of the UC3843A?

The UC3843A has a maximum switching frequency of 500kHz.

What is the maximum duty cycle for the UC3843A?

The maximum duty cycle for the UC3843A is 100%.

What are the undervoltage lockout (UVLO) levels for the UC3843A?

The undervoltage lockout (UVLO) levels for the UC3843A are 8.4V and 7.6V.

What is the operating temperature range for the UC3843A?

The operating temperature range for the UC3843A is 0°C to 70°C.

What package types are available for the UC3843A?

The UC3843A is available in PDIP (P) and SOIC (D) package types.

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