UC2843AQD8RVS Texas Instruments In Stock
UC2843AQD8RVS is a current-mode PWM controller IC by Texas Instruments with 500 kHz max frequency, 1 A gate drive output, and 8-pin SOIC package for flyback, forward, and boost converter designs. Key specs: fixed-frequency current-mode control, 8 V to 30 V input, -40°C to +85°C. Available in stock worldwide.
- Manufacturer
- Texas Instruments
- Package
- —
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- N/A
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode PWM control architecture enabling inherent cycle-by-cycle current limiting for improved short-circuit protection
- Maximum oscillator frequency up to 500 kHz enabling compact transformer and inductor designs
- 1 A peak totem-pole gate drive output minimizing MOSFET switching losses at high frequencies
- Input voltage range of 8 V to 30 V covering wide-input offline and DC/DC converter supply rails
- Integrated leading-edge blanking and slope compensation reducing susceptibility to switching noise
- 8-pin SOIC package allowing dense PCB layouts in power supply modules and adapter designs
Applications
The UC2843AQD8RVS is widely used as the primary control IC in isolated flyback converters, forward converters, and non-isolated boost regulators for power supplies in industrial equipment, telecom DC/DC modules, and AC/DC adapters. Its current-mode control loop simplifies compensation network design and provides inherent over-current protection, making it a standard choice for designing SMPS circuits in the 5 W to 100 W range. The device is also popular in motor-drive auxiliary power supplies and battery-charger controllers where tight voltage regulation and fast transient response are required.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC2843AQD8RVS:
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO14
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
Frequently Asked Questions
What switching frequency does UC2843AQD8RVS support and how does that affect power supply transformer size?
The UC2843AQD8RVS supports oscillator frequencies up to 500 kHz, with the frequency set by an external resistor and capacitor on the RT/CT pins. Operating at higher frequencies such as 200 kHz to 500 kHz significantly reduces the required transformer and output inductor core volume compared to 50 kHz designs, enabling more compact SMPS form factors in AC/DC adapters and DC/DC converter modules where PCB space is limited.
How does current-mode control in UC2843AQD8RVS improve power supply reliability compared to voltage-mode controllers?
Current-mode control on the UC2843AQD8RVS terminates each PWM cycle as soon as the inductor current reaches the programmed threshold, providing automatic cycle-by-cycle current limiting that prevents transformer saturation and MOSFET over-stress during load transients or startup inrush. This inherent protection reduces the number of external over-current sensing components needed and improves overall converter reliability in applications such as telecom rectifiers and industrial DIN-rail power supplies that must handle frequent load steps.
What gate drive capability does UC2843AQD8RVS provide for driving power MOSFETs at high switching frequencies?
The UC2843AQD8RVS output stage delivers 1 A peak source and sink current through its totem-pole gate driver, sufficient to charge and discharge the gate capacitance of medium-power MOSFETs with gate charges up to 50 nC within 50 ns at 500 kHz. This strong gate drive minimizes crossover losses and reduces MOSFET die temperature in flyback converters operating in the 20 W to 80 W power range, where switching-loss reduction is critical to achieving 85% or higher efficiency.
Related Guides
1206 100 uF MLCC Design Guide for Compact Bulk Decoupling
Design guidance for applying CL31A107MQHNNNE and related 1206 MLCCs in compact bulk decoupling networks.
Jul 3, 2026
0402 10 nF MLCC Design Guide for High-Speed Decoupling
Practical design guidance for using CL05B103KB5NNNC and related 0402 MLCCs in high-speed decoupling networks.
Jul 3, 2026
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”