XL3844 – PWM Controller – Xinluda

The Xinluda XL3844 is a fixed-frequency, current-mode PWM controller from the industry-standard 384x family, used in off-line and DC-DC switching power supplies. Available in SOP-8 for RFQ sourcing through Pacific Component Xchange.

The XL3844 from Xinluda is a fixed-frequency, current-mode PWM (pulse-width modulation) controller designed for off-line and DC-to-DC switching power supply applications. It belongs to the well-established 384x controller family and is a functional equivalent of the industry-standard UC3844, allowing it to serve as a cost-effective alternative in existing designs. The XL3844 integrates a trimmed oscillator, a temperature-compensated reference with under-voltage lockout, a high-gain error amplifier, a current-sensing comparator, and a high-current totem-pole output stage capable of directly driving a power MOSFET.

Key Features

• Fixed-frequency current-mode PWM control topology
• Member of the standard 384x controller family; functional equivalent of UC3844
• Under-voltage lockout (UVLO) thresholds of 16 V (turn-on) / 10 V (turn-off), suited to off-line operation
• Maximum duty cycle limited to under 50% via an internal toggle (divide-by-two) flip-flop, distinguishing the “3844” suffix from the “3842” variant
• Oscillator frequency guaranteed to 250 kHz
• Latched, cycle-by-cycle current limiting via an integrated current-sense comparator
• Internally trimmed reference with UVLO and hysteresis
• High-current totem-pole output for direct power-MOSFET gate drive
• Available in a space-saving SOP-8 package

Applications

• Off-line AC-DC switching power supplies
• Flyback and forward converters
• Isolated DC-DC converters
• Adapter and charger power stages
• Auxiliary and standby power supplies

Why Source XL3844 from Pacific Component Xchange

The XL3844 is a hard-to-find part with little to no authorized-distributor stock through mainstream channels. As an independent distributor specializing in power-management ICs and optocouplers, Pacific Component Xchange helps engineers and buyers secure obsolete, allocated, and hard-to-source components like the XL3844 with confidence. Our team focuses on authenticity and quality verification, supported by global shipping and responsive RFQ handling.

Need the XL3844 or a qualified equivalent? Request a quote (RFQ) from Pacific Component Xchange today and our sourcing specialists will respond with current availability, lead time, and pricing.