XL3526 – PWM Controller (Regulating Pulse Width Modulator) – Xinluda

The Xinluda XL3526 is a fixed-frequency regulating pulse width modulator (PWM) switching controller in an SOP-18 package, rated for a 7-35V supply and functionally aligned with the industry-standard SG3526 architecture for push-pull and single-ended switching power supplies.

The Xinluda XL3526 is a monolithic regulating pulse width modulator (PWM) switching controller designed for fixed-frequency switching power supplies. Supplied in an 18-pin SOP-18 package, it follows the architecture of the long-established SG3526 regulating PWM controller family, integrating a temperature-compensated voltage reference, sawtooth oscillator, error amplifier, pulse-width modulator, steering logic, and dual output drivers on a single device.

According to Xinluda’s published data, the XL3526 operates from a 7 V to 35 V supply, switches at frequencies up to 600 kHz, provides an output drive current of approximately 0.2 A, and is specified for a maximum duty cycle of 50%, making it well suited to push-pull as well as single-ended topologies. It supports a broad range of converter configurations including buck, boost, flyback, forward, half-bridge, full-bridge, and push-pull.

The XL3526 is intended for engineers building or maintaining single-ended and push-pull switching regulators in both transformerless and transformer-coupled topologies. As a part that follows the SG3526 architecture, it is frequently considered as an alternative for legacy designs and cost-sensitive production runs. Always verify the pinout and full electrical parameters against the device datasheet before substituting it into an existing SG3526-based design.

Key Features

• Regulating pulse width modulator (PWM) / switching-regulator controller IC
• Operating supply voltage range: 7 V to 35 V (per Xinluda data)
• Switching frequency up to 600 kHz
• Output drive current approximately 0.2 A
• Maximum duty cycle of 50% for push-pull operation
• Dual output drivers for push-pull and single-ended topologies
• On-chip temperature-compensated voltage reference
• Sawtooth oscillator with programmable frequency and deadtime
• Integrated error amplifier and pulse-width modulator
• Soft-start and undervoltage lockout (per SG3526 architecture)
• Supports buck, boost, flyback, forward, half-bridge, full-bridge, and push-pull converters
• SOP-18 surface-mount package

Applications

• Single-ended and push-pull switching power supplies
• DC-DC converters (transformerless and transformer-coupled)
• Off-line and on-board switch-mode regulators
• Industrial and instrumentation power modules
• Legacy SG3526-architecture design replacement and maintenance

Why Source XL3526 from Pacific Component Xchange

The XL3526 is a hard-to-find, request-for-quote part with little to no authorized-distributor stock. Pacific Component Xchange specializes in sourcing scarce, obsolete, and end-of-life power-management ICs and switching controllers like the XL3526. We support buyers who need to keep legacy switching-supply designs in production or fulfill spot shortages without redesigning around a different controller.

Every order is backed by our authenticity and inspection process to protect against counterfeit and non-conforming product, and we ship worldwide to support both prototype and volume requirements. Submit an RFQ today for current availability, lead time, and pricing on the Xinluda XL3526 and SG3526-architecture alternatives.