UCC3813DTR-4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UCC3813DTR-4 is a current-mode PWM switching controller IC with a 9.3 V to 11 V input range, designed for low-power offline flyback and forward converter designs, available in a compact SO-8 package for space-constrained power supply applications.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UCC3813DTR-4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.0978(MOQ 100)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Peak current-mode PWM control with programmable oscillator frequency up to 1 MHz enables fast transient response in compact flyback converter designs
- Integrated leading-edge blanking and slope compensation simplify cycle-by-cycle current sensing without additional discrete filter networks
- SO-8 (PDSO-G8) package with low quiescent current suits cost-sensitive low-power charger and auxiliary power supply applications up to 125°C
Applications
The UCC3813DTR-4 is used as the primary controller in low-power offline flyback converters for AC-DC adapters, auxiliary power supplies, and standby power stages in consumer electronics and industrial equipment. Its current-mode architecture with programmable frequency enables designers to optimize transformer size and loop bandwidth in isolated 5 W to 30 W power supplies operating from rectified mains voltages.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 11V |
| Input Voltage-Min | 9.3V |
| Input Voltage-Nom | 10V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Output Voltage-Max | 5.075V |
| Output Voltage-Min | 4.925V |
| Output Voltage-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 30mA |
| Supply Voltage-Max (Vsup) | 12V |
| Supply Voltage-Nom (Vsup) | 10V |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 1000kHz |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| 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 |
| Package | Small Outline Packages |
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 | Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UCC3813DTR-4:
Switching Controller, Current-mode, 1A, 1000kHz Switching Freq-Max, BICMOS, PDSO8
Frequently Asked Questions
What control mode does UCC3813DTR-4 use, and how does it improve transient response in a flyback converter?
UCC3813DTR-4 uses peak current-mode control, which regulates the switch peak current on a cycle-by-cycle basis rather than averaging duty cycle. This provides inherent single-pole response, faster load-step recovery typically within 50 µs, and automatic pulse-by-pulse overcurrent limiting, simplifying compensation network design compared to voltage-mode PWM controllers in 5 W to 30 W flyback power supplies.
What operating voltage range is required to power UCC3813DTR-4 and what does this mean for startup circuit design?
The UCC3813DTR-4 requires a 9.3 V to 11 V bias supply (nominal 10 V) on its VCC pin. In a flyback design this means the auxiliary winding must regulate to approximately 10 V before the controller enables the gate drive output, so the startup resistor and VCC capacitor must be sized to supply enough charge during the startup interval until the self-supply winding takes over, typically within 20 ms to 100 ms from AC mains application.
For a 10 W USB charger design, how does the SO-8 package of UCC3813DTR-4 benefit PCB layout versus a DIP-8 alternative?
The SO-8 SMD package occupies approximately 5 mm × 4 mm versus 10 mm × 6.5 mm for DIP-8, saving roughly 50 mm² of PCB real estate. In a compact 10 W USB charger measuring 30 mm × 30 mm, this space saving allows closer placement of the current-sense resistor and bypass capacitors within the high-frequency switching loop, reducing parasitic inductance and improving EMI performance without increasing PCB layer count.
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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 |
|---|---|---|
| 100+ | $1.3316 | $133.16 |
| 250+ | $1.2561 | $314.02 |
| 500+ | $1.2164 | $608.18 |
| 1000+ | $1.1200 | $1120.00 |
| 5000+ | $1.1000 | $5500.00 |
| 7500+ | $1.0978 | $8233.43 |
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