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Product Detailed Parameters
- Description：IC LED DRV OFFL TRIAC TO92-3
- Series：-
- Mfr：Microchip Technology
- Package：Bag
- Type：AC DC Offline Switcher
- Topology：Step-Down (Buck)
- Internal Switch(s)：Yes
- Number of Outputs：1
- Voltage - Supply (Min)：20V
- Voltage - Supply (Max)：400V
- Voltage - Output：-
- Current - Output / Channel：20mA
- Frequency：-
- Dimming：Triac
- Applications：Lighting
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Through Hole
- Package / Case：TO-226-3, TO-92-3 (TO-226AA)
- Supplier Device Package：TO-92-3
- Grade：-
- Qualification：-
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Overview
The HV9921N3-G is a single-channel, switch-mode LED lamp driver IC manufactured by Microchip Technology. It utilizes a buck topology to regulate constant current for LED loads. The device operates within an input voltage range of 20 V to 400 V and supports an output current of 20 mA. It functions at a switching frequency of 170 kHz with adjustable output voltage capabilities. The component is housed in a TO-92-3 package designed for through-hole mounting. It operates reliably across a temperature range from -40°C to +85°C, with a maximum power dissipation of 740 mW and a maximum supply current of 350 µA.
Feature Summary
- Provides constant current regulation for LED applications
- Supports PWM dimming functionality
- Designed for AC/DC offline switcher step-down (buck) topologies
Applications
- LED lamp drivers
- General lighting systems
- AC/DC offline power supplies
Procurement Notes
Verify the specific suffix 'N3-G' against official Microchip documentation to confirm RoHS compliance and lead-free status. Ensure the TO-92-3 through-hole package matches your PCB footprint requirements. Confirm that the 20 mA output current rating aligns with your LED string design. Check for any recent Product Change Notifications (PCNs) or End-of-Life (EOL) notices directly from the manufacturer before finalizing procurement.
Selection Notes
Select this component when a low-pin-count, through-hole solution is required for high-voltage AC/DC LED driving. The fixed 20 mA output current limits its use to specific low-power LED configurations. Consider alternative packages like SOIC-8 if surface-mount assembly is preferred. Verify that the 170 kHz switching frequency fits within your electromagnetic interference (EMI) constraints.
Part Context
This part belongs to the HV9921 family of 3-pin switch-mode LED lamp driver ICs. It is distinct from similar models such as the HV9925SG-G, which offers higher output current and surface-mount packaging. The HV9921 series is specifically engineered for cost-sensitive, high-volume lighting applications requiring simple external component counts.
Replacement Considerations
Direct substitutes may include other parts within the HV9921 family, provided pinouts and electrical characteristics match. Cross-referencing with datasheets is essential to ensure compatibility regarding input voltage ranges and thermal performance.
