UCC3818ANG4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The UCC3818ANG4 is a current-mode power factor pre-regulator controller IC from Texas Instruments, designed to achieve near-unity power factor in AC-DC offline power supplies operating at up to 115 kHz switching frequency. It operates from a 10.3 V to 15 V supply bias and provides PWM gate drive output for boost-stage MOSFET control, housed in a 16-pin PDIP package. Suitable for desktop PC power supplies, industrial AC-DC converters, and energy-efficient lighting drivers requiring IEC 61000-3-2 compliance.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- UCC3818ANG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UCC3818ANG4?
- Current-mode PWM control achieving power factor correction above 0.99 in boost PFC stages
- Operating frequency up to 115 kHz enabling compact magnetics design
- Integrated multiplier for line voltage feedforward shaping the inductor current waveform
- Under-voltage lockout activates at 10.3 V with hysteresis to ensure clean start-up
- Overvoltage protection comparator monitors boost output for safe shutdown above threshold
- 16-pin PDIP through-hole package for prototyping and low-to-medium volume production
What is UCC3818ANG4 used for?
The UCC3818ANG4 is used as the primary control IC in the boost power factor correction stage of desktop ATX power supplies, industrial 300 W to 1 kW AC-DC converters, and variable-speed motor drive front-ends where compliance with IEC 61000-3-2 harmonic limits is required. It also appears in electronic ballasts and LED driver power stages where high power factor and low total harmonic distortion (THD below 5%) are needed to meet energy efficiency regulations.
What are the specifications of UCC3818ANG4?
| YTEOL | 0 |
| Analog IC - Other Type | POWER FACTOR CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 15V |
| Input Voltage-Min | 10.3V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1.2A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Supply Current-Max (Isup) | 6mA |
| Surface Mount | NO |
| Switcher Configuration | BOOST |
| Switching Frequency-Max | 120kHz |
| Technology | BICMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the UCC3818ANG4 datasheet?
UCC3818ANG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for UCC3818ANG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What switching frequency does the UCC3818ANG4 support, and how does this affect the PFC inductor size?
The UCC3818ANG4 supports switching frequencies up to 115 kHz. At 100 kHz operation, the required boost inductor inductance for a 400 W PFC stage targeting 10% peak-to-peak ripple current is approximately 400 µH, compared to roughly 1.5 mH at 25 kHz. Higher switching frequency significantly reduces inductor size and weight, enabling more compact power supply designs.
How does the UCC3818ANG4 control the input current waveform to achieve high power factor?
The UCC3818ANG4 uses average current-mode control with an internal analog multiplier that generates a sinusoidal current reference proportional to the rectified line voltage. This reference forces the boost inductor average current to follow the input voltage waveform, resulting in a power factor typically above 0.99 and total harmonic distortion (THD) below 5% when properly compensated.
What supply voltage does the UCC3818ANG4 require, and how is the bias typically derived in a PFC stage?
The UCC3818ANG4 requires a VCC bias supply between 10.3 V and 15 V, with nominal operation at 12 V. In a typical offline PFC design, this bias is derived from an auxiliary winding on the boost inductor or from a small separate bias converter fed from the bulk DC rail. The IC's 10.3 V under-voltage lockout prevents gate drive output until the bias is stable, protecting the MOSFET from partial-voltage switching during power-up.
Does the UCC3818ANG4 include overvoltage protection for the PFC output rail?
Yes, the UCC3818ANG4 includes an overvoltage protection (OVP) comparator that monitors the PFC boost output voltage via a resistor divider. When the output exceeds the OVP threshold (set by resistor ratio to the 7.5 V reference), the controller shuts off the gate drive immediately. This protects the bulk capacitor and downstream converter from voltages that would otherwise destroy components rated for the nominal 400 V PFC output.
For a 500 W industrial AC-DC power supply, is the UCC3818ANG4 a suitable PFC controller, and are there pin-compatible alternatives?
The UCC3818ANG4 is suitable for PFC stages up to approximately 1 kW with appropriate MOSFET and inductor selection. For a 500 W design operating at 85 VAC to 265 VAC input, it provides sufficient loop bandwidth (typically 10 Hz to 20 Hz crossover) for stable operation. Pin-compatible alternatives include the UCC3818D (SOIC package for SMD assembly) and the L6562A from STMicroelectronics, which offer similar average current-mode PFC control in 16-pin packages.
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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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