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Texas Instruments UCC2817AN
- Part No.:
- UCC2817AN
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC2817AN.pdf
- Description:
- IC PFC CTR AV CURR 220KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,431
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Product details
Overview
UCC2817AN from Texas Instruments is a BiCMOS average current-mode power factor correction (PFC) controller for boost preregulators, operating across –40°C to +85°C with 12–18 V VCC supply, 16 V UVLO turn-on threshold, and ±1.2 A peak gate drive output. It enables near-unity power factor in sub-300 W IEC61000-3-2-compliant AC/DC supplies used in PC power, lighting, and industrial systems.
For engineers reviewing the UCC2817AN datasheet, UCC2817AN pinout, UCC2817AN application, or UCC2817AN equivalent, key selection criteria include its extended temperature rating, average current mode control architecture, 7.5 V internal reference accuracy, OVP/EN dual-function pin behavior, and compatibility with 16-pin PDIP packaging for through-hole prototyping and legacy industrial designs.
Technical Context
The UCC2817AN implements average current mode control using a high-gain current amplifier (90 dB open-loop gain), a precision 7.5 V reference (±1.5% over temperature), and a multiplier stage that computes IAC × (VAOUT − 1)/(K × VFF²) to generate the current command signal. Its oscillator supports 6–220 kHz via RT/CT programming with ±15% total variation over line and temperature.
Functional blocks include a zero-power comparator (0.33 V threshold on VAOUT), leading-edge PWM modulation, overvoltage protection with 500 mV hysteresis at OVP/EN, and a robust totem-pole gate driver with 9 Ω pull-up and 4 Ω pull-down resistance-enabling direct drive of MOSFET gates without external buffers in medium-power PFC stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 12 V to 18 V - ensures stable operation across wide input supply variations in offline PFC front-ends |
| UVLO Turn-on Threshold | 15.4 V to 16.6 V - guarantees reliable startup after bulk capacitor charges above ~16 V |
| Reference Voltage | 7.5 V ±1.5% - provides precise, temperature-stable bias for voltage error amplifier and feedback networks |
| Gate Drive Peak Current | ±1.2 A - directly drives standard MOSFET gates without external buffer, reducing BOM count |
| Oscillator Frequency Range | 6 kHz to 220 kHz - supports optimized magnetics design across 50–60 Hz universal input applications |
| Current Amplifier Offset | –3.5 mV to +2.5 mV - minimizes line current distortion at light loads by preserving low-current accuracy |
| Operating Temperature | –40°C to +85°C - validated for industrial and extended-environment power supply deployments |
Pinout & Package
UCC2817AN is housed in a 16-pin plastic dual in-line package (PDIP-N), 19.30 mm × 6.35 mm body size, with through-hole mounting and industry-standard lead pitch (2.54 mm). Thermal resistance RθJA = 49.3°C/W enables natural convection cooling in compact PFC boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference ground | Common return for all analog and power circuits; must be low-impedance star point |
| 2 PKLMT | Peak current limit sense input | Accepts voltage-referenced current sense signal; triggers shutdown when below 0 V |
| 3 CAOUT | Current amplifier output | Drives PWM latch; connects to compensation network between CAOUT and MOUT |
| 4 CAI | Current amplifier noninverting input | Connects to low-side current sense resistor; operates down to below GND for bidirectional sensing |
| 5 MOUT | Multiplier output / current amp inverting input | High-impedance node carrying scaled IAC × (VAOUT−1)/VFF²; sets duty cycle command |
| 6 IAC | Line voltage proportional current input | Accepts up to 500 µA current representing rectified AC line; enables feed-forward regulation |
| 7 VAOUT | Voltage amplifier output | Regulates boost output voltage; clamped to ~5.5 V to prevent overshoot during transients |
| 8 VFF | Feed-forward voltage input | Receives RMS-scaled line voltage (1.4 V at low line); improves line regulation and reduces THD |
| 9 VREF | 7.5 V precision reference output | Supplies bias to external circuits; delivers up to 20 mA; disabled below UVLO threshold |
| 10 OVP/EN | Overvoltage protection / enable input | Window comparator: disables DRVOUT if >1.07×VREF or <1.9 V; resets soft-start on under-voltage |
| 11 SSENSE | Voltage amplifier inverting input | Connects to output voltage divider; forms feedback loop with VAOUT for output regulation |
| 12 RT | Oscillator timing current input | Sets charging current for CT capacitor; nominal 3 V bias; 10–100 kΩ recommended range |
| 13 SS | Soft-start control | Charges external capacitor with 10 µA current source; ramps duty cycle linearly at startup |
| 14 CT | Oscillator timing capacitor connection | Capacitor to GND sets switching frequency; requires short, low-inductance trace |
| 15 VCC | Positive supply input | 12–18 V supply; bypass with ≥0.1 µF ceramic capacitor directly to GND for noise immunity |
| 16 DRVOUT | Gate driver output | Totem-pole MOSFET driver; ±1.2 A peak; series gate resistor recommended to damp ringing |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Stable, low-distortion sinusoidal line current shaping with inherent noise immunity and no right-half-plane zero |
| Leading-edge PWM modulation | Reduces ripple current in bulk output capacitor when synchronized with downstream DC-DC stage |
| On-chip 7.5 V reference | ±1.5% accuracy over –40°C to +85°C; supplies external circuitry and enables single-supply biasing |
| Zero-power detection | Comparator monitors VAOUT at 0.33 V threshold to disable gate drive during no-load or standby conditions |
| Overvoltage protection with hysteresis | 500 mV hysteresis at OVP/EN prevents oscillation during marginal overvoltage events |
| Low start-up current | 150 µA typical - enables bootstrap startup from auxiliary winding without dedicated bias supply |
Applications
| PC Power Supply | LED Driver Front-End |
|---|---|
|
Use Scenario: 250 W ATX-compatible power supply meeting IEC61000-3-2 Class D harmonic limits. IC Role / Device Role / Timing Role: Primary PFC controller regulating boost converter to shape 115/230 VAC input current waveform. Use Value: Achieves >0.99 power factor at full load and <5% THD, enabling compliance without passive filtering. |
Use Scenario: Constant-power LED driver for commercial lighting with universal AC input and dimmable output. IC Role / Device Role / Timing Role: Active PFC stage preceding LLC resonant converter; maintains stable bus voltage under phase-cut dimming. Use Value: Enables smooth dimming down to 1% while sustaining >0.95 PF and avoiding audible transformer buzz. |
| Industrial AC/DC Module | Consumer Audio Power Supply |
|
Use Scenario: Encapsulated 300 W industrial power module operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: PFC controller in sealed, convection-cooled enclosure requiring extended temperature reliability. Use Value: –40°C to +85°C rating ensures startup and regulation stability without derating or forced air. |
Use Scenario: High-fidelity AV receiver with multi-rail power supply and low-noise audio amplifiers. IC Role / Device Role / Timing Role: Low-EMI PFC stage minimizing conducted noise coupling into analog signal paths. Use Value: Average current mode + leading-edge modulation reduces high-frequency ripple, lowering EMI filter cost by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power factor correction controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2818AN | 10.2 V UVLO turn-on threshold vs 16 V; designed for fixed VCC supply rather than bootstrap startup | Preferred in designs with dedicated 12–15 V bias rail; unsuitable for bootstrap-fed PFC where VCC ramps from zero | Select UCC2818AN only when VCC is pre-regulated and stable before main AC input is applied |
| UCC3817AN | Same pinout and function but rated for 0°C to +70°C only; higher UVLO hysteresis (6.3 V vs 5.8 V) | Valid for commercial-temperature consumer products; not qualified for industrial or outdoor deployments | Choose UCC3817AN only for cost-sensitive, non-extended-temp applications where thermal margin is sufficient |
Compared with UCC2818AN and UCC3817AN, the UCC2817AN uniquely combines extended temperature operation (–40°C to +85°C) with 16 V UVLO for reliable bootstrap startup-making it the sole choice for ruggedized, universal-input PFC designs requiring both environmental robustness and self-powered initialization.
Availability
UCC2817AN is available at Aetrix Electronics and suitable for PC power supplies, LED driver front-ends, industrial AC/DC modules, and consumer audio power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UCC2817AN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management ICs, with decades of leadership in power conversion and energy-efficient system solutions.
The UCC2817AN belongs to TI's UCCx81xA BiCMOS PFC controller family, engineered specifically for high-efficiency, near-unity power factor boost preregulators in sub-300 W applications compliant with IEC61000-3-2.
FAQ
What is the operating temperature range of the UCC2817AN?
The UCC2817AN is specified for continuous operation from –40°C to +85°C ambient temperature. This extended range is confirmed in the device comparison tables and electrical characteristics section of the SLUS577D datasheet, distinguishing it from the UCC3817AN (0°C to +70°C) and enabling use in industrial and outdoor-rated power supplies where thermal margins are critical.
Does the UCC2817AN support bootstrap startup?
Yes, the UCC2817AN supports bootstrap startup due to its 16 V UVLO turn-on threshold and low 150 µA typical start-up current. When used with a high-impedance resistive divider or auxiliary winding, the internal shunt regulator allows VCC to ramp from zero, enabling self-powered initialization without an external bias supply-confirmed in the "Description" and "Device Functional Modes" sections of the datasheet.
What package type is the UCC2817AN supplied in?
The UCC2817AN is supplied exclusively in the 16-pin plastic dual in-line package (PDIP-N), with body dimensions of 19.30 mm × 6.35 mm and standard 2.54 mm lead pitch. This is explicitly listed in the "Device Information" table and "Orderable Addendum" of the SLUS577D datasheet, and differs from SOIC (D) or TSSOP (PW) variants offered for other members of the family.
How does the OVP/EN pin function on the UCC2817AN?
The OVP/EN pin on the UCC2817AN serves dual functions: it disables the DRVOUT gate driver when the boost output exceeds 1.07×VREF (≈8.03 V), and forces soft-start reset when pulled below 1.9 V. The 500 mV hysteresis prevents chatter during marginal overvoltage events, and this behavior is verified in the "Electrical Characteristics" table under "Over Voltage Protection and Enable Section" of the datasheet.
Is the UCC2817AN pin-compatible with other UCCx81xA devices?
Yes, the UCC2817AN is pin-compatible with UCC2818AN, UCC3817AN, and UCC3818AN in the same PDIP package. The "Device Comparison Tables" confirm identical pin configurations across all four variants, and the "Description (Continued)" section states they are "directly pin for pin compatible"-though functional differences (e.g., UVLO thresholds, temperature grade) require careful schematic review.
UCC2817AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Mode:
- Average Current
- Frequency - Switching:
- 6kHz ~ 220kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 12V ~ 17V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UCC2817AN FAQ
1.How can I place an order for UCC2817AN through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2817AN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UCC2817AN reliable?
The price and inventory of UCC2817AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2817AN is usually 5 days.
3.What payment methods are accepted for UCC2817AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2817AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2817AN?
UCC2817AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2817AN order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UCC2817AN?
For technical support, including UCC2817AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2817AN requirements.
6.How does Aetrix verify that UCC2817AN is sourced from the original manufacturer or authorized distributors?
All UCC2817AN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UCC2817AN meets industry standards.
7.What is the process for return or replacement of UCC2817AN?
All UCC2817AN units undergo pre-shipment inspection (PSI). If there is an issue with UCC2817AN, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UCC2817AN part is unused and in its original packaging.
Return procedure for UCC2817AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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