UCC28712DR Texas Instruments (SOP) In Stock
UCC28712DR is a primary-side regulation flyback switching controller by Texas Instruments with frequency and amplitude modulation control. Key specs: 9 V to 35 V input range, current/voltage-mode control, 7-pin SOIC package. In stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Pin Count
- 7
- Lifecycle
- ACTIVE
- Datasheet
- UCC28712DR Datasheet PDF
- Price
- From $0.5600(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Primary-side regulation eliminates optocoupler and secondary-side feedback components, reducing BOM count by up to 5 parts in isolated flyback supplies
- Dual-mode frequency and amplitude modulation control improves light-load efficiency, enabling power supplies to meet Energy Star and EU CoC Tier 2 standby standards
- 9 V to 35 V input voltage range with 25 V nominal covers universal AC adapter and DC-DC converter applications from 5 W to 15 W output
Applications
The UCC28712DR is designed for cost-sensitive isolated flyback power supplies used in USB chargers, home appliances, lighting drivers, and smart metering equipment. Its primary-side regulation eliminates the need for an optocoupler and TL431 reference on the secondary side, reducing total component count and improving reliability in sealed enclosures. The device's frequency modulation and amplitude modulation control deliver high efficiency across load conditions, meeting global energy efficiency standards for standby power.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | ALSO OPERATES IN AMPLITUTDE MODULATION CONTROL TECHNIIQUE |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT/VOLTAGE-MODE |
| Control Technique | FREQUENCY MODULATION |
| Input Voltage-Max | 35V |
| Input Voltage-Min | 9V |
| Input Voltage-Nom | 25V |
| JESD-30 Code | R-PDSO-G7 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Supply Voltage-Nom (Vsup) | 25V |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 100kHz |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does the UCC28712DR support, and what output power range is it designed for in flyback converters?
The UCC28712DR operates with input voltages from 9 V to 35 V with a 25 V nominal rail, making it compatible with rectified universal AC inputs after a bulk capacitor stage. It is optimized for output power levels between 5 W and 15 W, suitable for USB chargers, set-top box adapters, and low-power appliance supplies that need isolated regulation without secondary feedback components.
How does the UCC28712DR achieve high light-load efficiency compared to fixed-frequency flyback controllers?
The UCC28712DR uses both frequency modulation (FM) and amplitude modulation (AM) control techniques. At light loads, switching frequency decreases, reducing switching losses, while amplitude modulation lowers peak currents, cutting core and conduction losses. Together, these techniques help achieve no-load standby power below 30 mW and efficiency improvements of 3% to 5% at 10% load compared to conventional fixed-frequency PWM controllers.
Which package does the UCC28712DR use, and how does it benefit PCB layout in a compact charger design?
The UCC28712DR comes in a 7-pin SOIC (SO-7) package with a 1.27 mm pin pitch and a body measuring approximately 3.9 mm x 4.9 mm. This small footprint allows the controller to be placed close to the flyback transformer primary on a compact AC adapter PCB. The 7-pin configuration provides dedicated pins for gate drive, current sense, and VCC, simplifying layout and reducing parasitic inductance in the switching loop.
Can the UCC28712DR replace an optocoupler-based secondary feedback design, and what components does it eliminate?
Yes. The UCC28712DR uses primary-side regulation (PSR), sampling the output voltage reflected through the transformer during switch-off time. This eliminates the optocoupler, TL431 shunt reference, and associated biasing resistors typically found on the secondary side—removing at least 4 to 5 components from the BOM. The result is a lower-cost, higher-reliability design suitable for sealed enclosures where optocoupler aging would otherwise reduce long-term stability.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.3300 | $1.33 |
| 1000+ | $0.7497 | $749.70 |
| 2500+ | $0.6940 | $1735.00 |
| 5000+ | $0.6900 | $3450.00 |
| 10000+ | $0.6684 | $6684.00 |
| 100000+ | $0.5600 | $56000.00 |
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