UC3843BVD1R2G AC-DC Power Conversion by ON Semiconductor

High Performance Current Mode PWM Controller

Status: Active
Series: UC3843B
RoHS: Compliant
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The UC3842B, UC3843B series are high performance fixed frequency current mode controllers. They are specifically designed for Off-Line and dc-to-dc converter applications offering the designer a cost-effective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. These devices are available in an 8-pin dual-in-line and surface mount (SO-8) plastic package as well as the 14-pin plastic surface mount (SO-14). The SO-14 package has separate power and ground pins for the totem pole output stage. The UCX842B has UVLO thresholds of 16 V (on) and 10 V (off), ideally suited for off-line converters. The UCX843B is tailored for lower voltage applications having UVLO thresholds of 8.5 V (on) and 7.6 V (off).

Where to Buy

Prices starting from US$0.24

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Newark Electronics
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Future Electronics
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Avnet America
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Avnet Asia
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Trimmed Oscillator for Precise Frequency Control
Oscillator Frequency Guaranteed at 250 kHz
Current Mode Operation to 500 kHz
Automatic Feed Forward Compensation
Latching PWM for Cycle-By-Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
Pb-Free Packages are Available


Description UC3843B
Compliance Pb-free Halide free
Topology Flyback
Control Mode Current Mode
fsw Typ (kHz) 52
Stand-by Mode No
UVLO (V) Yes
Short Circuit Protection Yes
Latch No
Soft Start Yes
VCC Max (V) 30
Drive Cap. (mA) 200 / 200
Package Type SOIC-8

Alternative Descriptions

Controller, Current Mode, 500Khz, 8Soic | Newark Electronics
UC3843B Series 30 V 275 kHz High Performance Current Mode Controller - SOIC-8 | Future Electronics
Current Mode PWM Controller 1A 8-Pin SOIC N T/R | Avnet America

Frequently Asked Questions

Where can I find additional details, specifications and documents for a UC3843BVD1R2G?

Additional datasheets, footprints and schematics for UC3843BVD1R2G are listed on our Part Details page. You can also find images and similar parts to UC3843BVD1R2G on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for UC3843BVD1R2G on our Product Comparison page. Access via the 'View Pricing & Stock' button to view UC3843BVD1R2G price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does UC3843BVD1R2G fall under?

The UC3843BVD1R2G is listed under Power Management > AC-DC Power Conversion > Offline Controllers.

Can I view similar or alternative parts?

You can view similar parts to UC3843BVD1R2G when available in the Offline Controllers range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the UC3843BVD1R2G you can contact the distributor directly for product support, shipping queries etc.

Is the UC3843BVD1R2G RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by ON Semiconductor.

Which authorised distributors for UC3843BVD1R2G have stock available?

Authorised distributors including Newark Electronics, element14, Farnell, Future Electronics and Avnet America have stock available or on a lead time for UC3843BVD1R2G.

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