XD494 – PWM Controller – Xinluda

The Xinluda XD494 is a fixed-frequency, dual error-amplifier PWM control IC in a DIP-16 package, pin-compatible with the industry-standard TL494, for push-pull and single-ended switch-mode power supplies.

The Xinluda XD494 is a complete pulse-width-modulation (PWM) control circuit integrated on a single monolithic chip, supplied in a through-hole DIP-16 package. Functionally and pin-for-pin compatible with the classic TL494, the XD494 combines two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, an internal 5V precision reference, and two uncommitted output transistors. This integration makes the XD494 a cost-effective core controller for a wide range of switch-mode and AC-DC power supply designs.

The device supports both push-pull and single-ended (common-emitter or emitter-follower) output operation, selectable via the output-control pin. During push-pull operation, the internal pulse-steering logic structurally prevents double-pulse output. The dead-time control comparator includes a fixed offset that provides approximately 5% dead time, and the common-mode input range of the error amplifiers spans -0.3V to (Vcc – 2V).

Key Features

• Complete single-chip PWM control circuit (TL494-equivalent)
• Two on-chip error amplifiers with common-mode range -0.3V to Vcc-2V
• On-chip adjustable oscillator; operation up to 300 kHz
• Internal 5V (+/-5%) precision reference / regulator
• Two uncommitted output transistors rated up to 200 mA (source or sink)
• Selectable push-pull or single-ended output operation
• Dead-time control comparator with ~5% fixed dead time; pulse-steering prevents double-pulse output
• Supply voltage operation up to 40V
• Operating temperature range 0 C to 70 C
• DIP-16 through-hole package; RoHS compliant

Applications

• Push-pull and single-ended switch-mode power supplies (SMPS)
• AC-DC converters and offline power adapters
• DC-DC converters and inverters
• Battery chargers and industrial power modules
• LED driver and lighting power stages
• Motor drive and general PWM control circuits

Why Source XD494 from Pacific Component Xchange

The Xinluda XD494 is a hard-to-find PWM controller with limited authorized-distributor availability, and stock at mainstream catalog distributors is frequently depleted. Pacific Component Xchange is an independent distributor specializing in scarce and obsolete power-management ICs. We help engineers and buyers secure the XD494 and TL494-family equivalents when standard supply channels come up empty.

Every order is backed by our authenticity and quality-assurance commitment, with inspection and counterfeit-avoidance procedures to protect your build. We offer global shipping and responsive sourcing for both prototype quantities and production runs. Request a quote (RFQ) today for current pricing, lead time, and available stock on the XD494 from Pacific Component Xchange.