SWITCHING CONTROLLER The UC3843N is fixed frequency current-mode PWM controller. It is specially designed for Off-Line and DC to DC converter applications with minimum external components. Furthermore, Huge range of Semiconductors, Capacitors, Resistors and IcS in stock. Welcome RFQ.
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Feb 23, 2022
Lena Stella
SWITCHING CONTROLLER
The UC3843N is fixed frequency current-mode PWM controller. It is specially designed for Off-Line and DC to DC converter applications with minimum external components. Furthermore, Huge range of Semiconductors, Capacitors, Resistors and IcS in stock. Welcome RFQ.
UC3843N
The following figure is the diagram of UC3843N Pinout.
Pinout
The followings are UC3843N Symbol, Footprint and 3D Model.
PCB Symbol
PCB Footprint
3D Model
The UC3843N is fixed frequency current-mode PWM controller. It is specially designed for Off-Line and DC to DC converter applications with minimum 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 for driving a Power MOSFET. The UC3843 is 8.5V(on) and 7.9V (off). The UC3843 can operate within 100% duty cycle.
This article provides you with a basic overview of the UC3843N SMPS Controller, including its pin descriptions, features and specifications, etc., to help you quickly understand what UC3843N is.
● Low Start up Current
● Maximum Duty Clamp
● UVLO With Hysteresis
● Operating Frequency up to 500KHz
Rochester Electronics, LLC UC3843N technical specifications, attributes, parameters and parts with similar specifications to Rochester Electronics, LLC UC3843N.
| Product Attribute | Attribute Value | |
|---|---|---|
| Surface Mount | NO | |
| Package / Case | 8-DIP (0.300, 7.62mm) | |
| Mounting Type | Through Hole | |
| Packaging | Tube | |
| Operating Temperature | 0°C~70°C TA | |
| JESD-609 Code | e4 | |
| Pbfree Code | yes | |
| Part Status | Obsolete | |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | |
| Number of Terminations | 8Terminations | |
| Terminal Finish | NICKEL PALLADIUM GOLD | |
| Terminal Position | DUAL | |
| Peak Reflow Temperature (Cel) | 260 |
| Product Attribute | Attribute Value | |
|---|---|---|
| Terminal Pitch | 2.54mm | |
| JESD-30 Code | R-PDIP-T8 | |
| Function | Step-Up, Step-Up/Step-Down | |
| Number of Outputs | 1Output | |
| Output Voltage | 5V | |
| Output Type | Transistor Driver | |
| Input Voltage-Nom | 15V | |
| Analog IC - Other Type | SWITCHING CONTROLLER | |
| Output Configuration | Positive | |
| Voltage - Supply (Vcc/Vdd) | 7.6V~30V | |
| Control Features | Frequency Control | |
| Input Voltage (Min) | 8.2V | |
| Topology | Boost, Flyback |
| Product Attribute | Attribute Value | |
|---|---|---|
| Control Mode | CURRENT-MODE | |
| Output Current-Max | 1A | |
| Frequency - Switching | Up to 500kHz | |
| Input Voltage (Max) | 25V | |
| Control Technique | PULSE WIDTH MODULATION | |
| Synchronous Rectifier | No | |
| Switcher Configuration | SINGLE | |
| Duty Cycle (Max) | 97% | |
| Width | 7.62mm | |
| Height Seated (Max) | 5.08mm | |
| Length | 9.59mm | |
| RoHS Status | ROHS3 Compliant |
The following is the Internal Block Diagram of UC3843N.
Internal Block Diagram
| Model number | Manufacturer | Description |
| MIC38HC42-1YM | Microchip Technology Inc | IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,SOP,14PIN,PLASTIC |
| UC3844BVDR2G | Rochester Electronics LLC | 1 A SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PDSO14, ROHS COMPLIANT, SOIC-14 |
| CS3843BGN8 | ON Semiconductor | 1A SWITCHING CONTROLLER, PDIP8, 0.300 INCH, PLASTIC, MS-001, DIP-8 |
| LT1245IJ8 | Linear Technology | IC SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, CERAMIC, DIP-8, Switching Regulator or Controller |
| MIC38HC43-1YM | Microchip Technology Inc | IC,SMPS CONTROLLER,CURRENT-MODE,BICMOS,SOP,14PIN,PLASTIC |
| CS3845BGD8 | ON Semiconductor | 1A SWITCHING CONTROLLER, PDSO8, 0.150 INCH, MS-012, SO-8 |
| LT1241MJ8 | Linear Technology | IC 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8, 0.300 INCH, HERMETIC SEALED, CERDIP-8, Switching Regulator or Controller |
| TC38C43COE | Microchip Technology Inc | 1.2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| UC1844AL/883B | Unitrode Corporation | Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, CQCC20 |
| LT1244CS8#PBF | Analog Devices Inc | High Speed Current Mode Pulse Width Modulators |
The following diagrams show the UC3843N Package.
View A
View B
View C
Rochester Electronics is the largest continuing source manufacturer of semiconductors in the world. With product licensing from leading manufacturers such as Analog Devices, Altera, Cypress, Fairchild, Freescale, Infineon, Intel, NXP, Renesas and Texas Instruments, Rochester continues to manufacture and distribute mature products. For industrial, transportation and hi-reliability markets, this extension of product life is critical for long term production and maintenance. With over 100,000 products and 15 billion units in stock, no other company compares to our selection, capabilities or solutions.
Download datasheets and manufacturer documentation for UC3843N
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