PUCC28742DBVR Texas Instruments Integrated Circuit (SOT23 (6-Pin)) In Stock
PUCC28742DBVR is a Texas Instruments high-efficiency flyback controller with optocoupler feedback for isolated AC-DC and DC-DC power supplies. It integrates primary-side regulation and valley switching for optimized efficiency across light and full load. Available in SOT-23 6-pin package with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- SOT23 (6-Pin)
- Pin Count
- 6
- Lifecycle
- OBSOLETE
- Datasheet
- PUCC28742DBVR Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Primary-side controller with optocoupler feedback for isolated flyback power supply designs up to tens of watts
- Valley switching technique minimizes switching losses and reduces EMI across the full load range
- Integrated startup, soft-start, and protection features reduce external component count in flyback designs
- SOT-23 6-pin package delivers ultra-compact footprint for space-constrained charger and adapter PCBs
Applications
PUCC28742DBVR is used in isolated flyback converters for USB chargers, AC adapter power supplies, and auxiliary power rails in industrial equipment requiring galvanic isolation between primary and secondary circuits. Its valley-switching control enables high efficiency at light loads, making it suitable for Energy Star-compliant standby power supplies in consumer electronics. The optocoupler feedback architecture provides stable closed-loop regulation with tight output voltage accuracy across wide input voltage and load variations.
Specifications
| Date Of Intro | 2018-04-14 |
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Package | SOT23 (6-Pin) |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for PUCC28742DBVR:
Frequently Asked Questions
What control technique does PUCC28742DBVR use to achieve high efficiency in flyback converter designs?
PUCC28742DBVR uses valley switching, which initiates the MOSFET turn-on at the lowest point of the drain voltage resonant ringing, reducing switching losses by up to 50% compared to fixed-frequency hard-switching controllers, significantly improving efficiency especially at light loads below 20% of rated power.
How does PUCC28742DBVR's optocoupler feedback architecture maintain output voltage regulation in an isolated flyback supply?
PUCC28742DBVR receives secondary-side output voltage error signals through an optocoupler, closing the feedback loop while maintaining 3 kV or greater galvanic isolation between primary and secondary grounds, enabling accurate output voltage regulation within ±1% or better across line and load variations.
For a 5 V / 2 A USB charger design, what advantages does PUCC28742DBVR offer over a non-isolated buck converter?
PUCC28742DBVR provides mandatory galvanic isolation required by safety standards such as IEC 60950-1 and IEC 62368-1 for mains-connected chargers. Its flyback topology generates 5 V output from 85 V to 265 V AC input with the SOT-23 controller keeping secondary PCB area under 10 cm².
What built-in protection features does PUCC28742DBVR include to improve reliability in production charger designs?
PUCC28742DBVR integrates overcurrent protection with cycle-by-cycle current limiting, overvoltage protection, thermal shutdown at approximately 150°C, and a soft-start function that limits inrush current during startup, reducing external protection component count and simplifying UL and CE certification for isolated flyback power supplies.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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