UCC28720DR Texas Instruments (SOP) In Stock
UCC28720DR is a primary-side regulation flyback switching controller by Texas Instruments using constant-voltage constant-current control with frequency modulation. Key specs: 9 V to 450 V input range, current/voltage-mode control, 7-pin SOIC package. From stock, in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- —
- Pin Count
- 7
- Lifecycle
- ACTIVE
- Datasheet
- UCC28720DR Datasheet PDF
- Price
- From $0.5326(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 opto-coupler and secondary feedback components, reducing BOM cost and improving reliability in AC-DC flyback converters up to 450 V input
- Constant-voltage constant-current (CV/CC) control mode with frequency modulation enables tight output regulation for USB charger and adapter applications without secondary-side error amplifier
- Ultra-low standby power consumption below 30 mW at 230 VAC no-load meets Energy Star and EU CoC Tier 2 standby power standards in a compact 7-pin SOIC package
Applications
UCC28720DR is optimized for offline AC-DC flyback converters in USB chargers, AC adapters, and auxiliary power supplies where elimination of the opto-coupler simplifies design and reduces part count. Its primary-side regulation with CV/CC control supports USB Battery Charging 1.2 and USB Power Delivery adapters that require accurate 5 V output voltage and current limiting from 85 VAC to 265 VAC input. The 7-pin SOIC package and integrated high-voltage startup current source reduce external component count in cost-sensitive wall adapter and smart home device power supply designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT/VOLTAGE-MODE |
| Control Technique | FREQUENCY MODULATION |
| Input Voltage-Max | 450V |
| Input Voltage-Min | 9V |
| Input Voltage-Nom | 25V |
| JESD-30 Code | R-PDSO-G7 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 3A |
| Output Voltage-Max | 20V |
| Output Voltage-Min | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP7/8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 2.65mA |
| Supply Voltage-Nom (Vsup) | 25V |
| Surface Mount | YES |
| Switcher Configuration | BUCK-BOOST |
| Switching Frequency-Max | 80kHz |
| Technology | BICMOS |
| 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
Compatible alternatives and drop-in replacements for UCC28720DR:
Switching Controller, Current/voltage-mode, 3A, 80kHz Switching Freq-Max, BICMOS, PDSO7
Frequently Asked Questions
What input voltage range does UCC28720DR support for universal AC-DC adapter designs?
UCC28720DR supports 9 V to 450 V input voltage range, covering universal AC input from 85 VAC to 265 VAC after rectification. The 450 V maximum rating accommodates line voltage peaks and transients on a 265 VAC input, making it suitable for worldwide universal AC-DC flyback adapter designs without input voltage switching.
How does UCC28720DR's primary-side regulation eliminate the opto-coupler in a USB charger design?
UCC28720DR senses the output voltage and current indirectly from the primary flyback waveform during the off-time demagnetization period, without requiring a secondary-side TL431 and opto-coupler feedback path. This primary-side sensing approach reduces component count by 3 to 5 parts and eliminates the reliability concern of opto-coupler CTR degradation over 5 V adapter lifetime.
What standby power performance does UCC28720DR achieve and which efficiency standards does it meet?
UCC28720DR achieves below 30 mW no-load standby power consumption at 230 VAC input through its frequency modulation and burst-mode operation at light loads. This meets Energy Star 2.0, EU Code of Conduct Tier 2, and DoE Level VI efficiency standards for external power supplies, which require standby input power below 100 mW for adapters under 49 W.
Can UCC28720DR provide constant-current output for a 5 V 2 A USB charger without secondary feedback?
Yes. UCC28720DR implements primary-side CV/CC control that regulates both 5 V output voltage and 2 A constant current limit using only primary winding voltage sensing and a current sense resistor. The CC mode engages when the load current exceeds the programmed threshold, clamping output at 2 A without any secondary-side current sense or amplifier, simplifying the flyback transformer design.
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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+ | $1.2700 | $1.27 |
| 279+ | $1.0700 | $298.53 |
| 1000+ | $0.7130 | $713.00 |
| 10000+ | $0.6357 | $6357.00 |
| 100000+ | $0.5326 | $53260.00 |
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