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Product Detailed Parameters
- Description：PRIMARY-SIDE-REGULATION PWM CONT
- Series：*
- Mfr：onsemi
- Package：Bulk
- Type：-
- Topology：-
- Internal Switch(s)：-
- Number of Outputs：-
- Voltage - Supply (Min)：-
- Voltage - Supply (Max)：-
- Voltage - Output：-
- Current - Output / Channel：-
- Frequency：-
- Dimming：-
- Applications：-
- Operating Temperature：-
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：-
- Qualification：-
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Overview
The FL663MX is a single-stage primary-side-regulation PWM controller manufactured by onsemi. It integrates power switching and control functions to simplify power supply designs. The device operates as a primary-side regulated controller, eliminating the need for optocouplers and secondary-side feedback components. This architecture reduces component count and improves reliability in low-power applications.
Feature Summary
- Integrates power switch and PWM controller for single-stage design
- Enables primary-side regulation without optocouplers
- Simplifies circuit topology by reducing external component count
Applications
- Low-power AC-DC adapters
- Standby power supplies
- LED drivers requiring primary-side regulation
Procurement Notes
Verify the exact suffix MX against the official onsemi datasheet to confirm pinout and thermal characteristics. Ensure the source document explicitly identifies the manufacturer as onsemi or its predecessor Fairchild Semiconductor, as part numbers may have been transferred during corporate acquisitions. Cross-reference the package type with the specific datasheet revision to avoid compatibility issues with existing PCB footprints.
Selection Notes
Select this component for designs prioritizing simplicity and cost reduction in low-power isolated converters. The primary-side regulation approach is suitable where tight output voltage tolerance is not critical. Evaluate thermal performance requirements based on the integrated power switch capabilities defined in the electrical specifications section of the datasheet.
Part Context
The FL663MX belongs to the FL663 series of single-stage controllers. It is functionally related to the FL6630 and FL6632 variants, which share similar primary-side regulation architectures. These devices are designed for high integration levels in consumer electronics power stages.
Replacement Considerations
The FL6630MX is a closely related variant within the same product family. Verify functional equivalence and pin compatibility before substitution. Other primary-side regulators from different manufacturers require full schematic and thermal re-evaluation.
