XL3843 – Current-Mode PWM Controller – Xinluda

The Xinluda XL3843 is a high-performance current-mode PWM controller in an 8-pin SOP-8 package, pin-compatible with the industry-standard UC3843 family for offline and DC-DC switching power supplies.

The Xinluda XL3843 is a high-performance, fixed-frequency current-mode PWM controller designed for offline AC-DC and DC-DC switching power converters. Housed in a compact 8-pin SOP-8 surface-mount package, it follows the well-established UC3843/3843-series architecture, making it a familiar and easy-to-design-in building block for cost-sensitive power supply designs. The XL3843 integrates the core control functions required for current-mode operation, including under-voltage lockout (UVLO) and cycle-by-cycle over-current protection (OCP).

Key Features

• High-performance current-mode PWM control topology
• 8-pin SOP-8 surface-mount package
• Supply (VCC) operating range of 12V to 28V
• Output drive current rated at 200mA for driving an external power MOSFET
• Nominal oscillator / switching frequency of 52kHz
• Under-Voltage Lockout (UVLO) with hysteresis for clean start-up and shutdown
• Cycle-by-cycle Over-Current Protection (OCP)
• Latching PWM for cycle-by-cycle current limiting
• Operating temperature range of -25°C to +80°C
• RoHS compliant

Applications

• Offline AC-DC switch-mode power supplies (SMPS)
• Flyback and forward converter power stages
• Isolated DC-DC converters
• Auxiliary and standby power supplies
• Adapters, chargers and LED driver power stages
• Industrial and consumer power modules

Why Source XL3843 from Pacific Component Xchange

The XL3843 is a regional, hard-to-find part with little to no authorized-distributor coverage outside of a small number of Asia-based catalog sellers. Pacific Component Xchange specializes in sourcing scarce, obsolete and allocation-constrained power-management ICs like the XL3843 for buyers who cannot find reliable stock through mainstream channels. We focus on authenticity, traceability and global logistics so your production line is not held up by a single difficult line item.

Submit a Request for Quote (RFQ) and our sourcing team will confirm available stock, lead time, packaging and pricing for the quantity you need. Whether you require a small prototype run or volume production support, Pacific Component Xchange can help you secure the XL3843 and ship it worldwide. Contact Pacific Component Xchange today to request a quote on the Xinluda XL3843.