UC3843BNG AC-DC Power Conversion by ON Semiconductor

High Performance Current Mode PWM Controller

Status: Active
Series: UC3843B
RoHS: Compliant
View Datasheet Manufacturer Site View Pricing & Stock

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).

Prices starting from US$0.38


Distributor Starting From Stock
Logo for Future Electronics Future Electronics US$0.38
2,620
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Logo for Transfer Multisort Elektronik Transfer Multisort Elektronik US$0.51
77
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Logo for Newark Electronics Newark Electronics US$0.52
30
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Logo for element14 element14 US$0.45
22
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Logo for Avnet America Avnet America US$0.40
-
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Logo for Avnet Asia Avnet Asia US$0.40
-
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Logo for Farnell Farnell US$0.43
-
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Features

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

Specifications

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 No
VCC Max (V) 30
Drive Cap. (mA) 200 / 200
Package Type PDIP-8

Alternative Descriptions

UC3843B Series 30 V 275 kHz High Performance Current Mode Controller - PDIP-8 | Future Electronics
Current mode PWM controller,UC3843BN 5V | RS
IC: PMIC | Transfer Multisort Elektronik
Pwm Ctrl, Current Mode, 30V, 1A, Dip-8 | Newark Electronics
PWM CTRL, CURRENT MODE, 30V, 1A, DIP-8 | element14
Current Mode PWM Controller 1A 8-Pin PDIP Rail | Avnet America


Frequently Asked Questions

Where can I find additional details, specifications and documents for a UC3843BNG?

Additional datasheets, footprints and schematics for UC3843BNG are listed on our Part Details page. You can also find images and similar parts to UC3843BNG on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for UC3843BNG on our Product Comparison page. Access via the 'View Pricing & Stock' button to view UC3843BNG price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does UC3843BNG fall under?

The UC3843BNG is listed under Power Management > AC-DC Power Conversion > Offline Controllers.

Can I view similar or alternative parts?

You can view similar parts to UC3843BNG 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 UC3843BNG you can contact the distributor directly for product support, shipping queries etc.

Is the UC3843BNG RoHS compliant?

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

Which authorised distributors for UC3843BNG have stock available?

Authorised distributors including Future Electronics, RS, Transfer Multisort Elektronik, Newark Electronics and element14 have stock available or on a lead time for UC3843BNG.

How do I check stock and lead times for all distributors?

Stock availability and lead times will be displayed for UC3843BNG often in real-time on the comparison pages.

What if I can't find stock of UC3843BNG?

You can fill out our help required form which you can use to request a quote for UC3843BNG from some of our verified obsolescence suppliers. Alternatively, contact us via our web chat in the bottom left of your screen and one of our team will try to help.

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