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Texas Instruments UCC2817AD
- Part No.:
- UCC2817AD
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2817AD.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,673
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Product details
Overview
UCC2817AD from Texas Instruments is a BiCMOS average current-mode power factor correction (PFC) controller for boost preregulators, operating across –40°C to +85°C, supporting 12–18 V VCC supply, 6–220 kHz adjustable switching frequency, and delivering ±1.2 A peak gate drive for MOSFETs in IEC 61000-3-2-compliant sub-300 W AC/DC supplies.
For engineers reviewing the UCC2817AD datasheet, UCC2817AD pinout, UCC2817AD application, or UCC2817AD equivalent, this page delivers verified technical context, exact pin functions, real-world PFC design constraints (e.g., 7.5 V VSENSE threshold, 0.33 V zero-power comparator trip), and validated alternative options for industrial and consumer power supply development.
Technical Context
The UCC2817AD implements average current-mode control with a high-gain (90 dB) current amplifier and a precision 7.5 V reference (±1.5% over temperature), enabling low-distortion sinusoidal line current shaping. Its multiplier accepts IAC, VFF, and VAOUT inputs to generate MOUT current proportional to line voltage × error signal, supporting feed-forward line regulation and leading-edge PWM modulation.
It integrates UVLO with 16 V turn-on / 9.7 V turn-off hysteresis, overvoltage protection triggered at VREF + 0.5 V (≈8.0 V) with 500 mV hysteresis, and a zero-power detection block that latches DRVOUT low when VAOUT falls below 0.33 V - all optimized for stable, noise-immune operation in universal-input offline converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 12 V to 18 V - supports bootstrap or auxiliary winding-derived bias without external LDO |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade power supply environments |
| Switching Freq | 6 kHz to 220 kHz - set via RT/CT; enables optimization of EMI, magnetics size, and efficiency |
| Gate Drive | ±1.2 A peak - drives MOSFET gates directly with low Rpullup (9 Ω typ) and Rpulldown (4 Ω typ) |
| VREF Output | 7.5 V ±1.5% - powers external circuitry and serves as precision reference for PKLMT and OVP thresholds |
| VSENSE Threshold | 7.5 V - defines maximum regulated output voltage for boost stage (e.g., 385 V DC with 51:1 divider) |
| Zero-Power Trip | 0.33 V on VAOUT - disables switching when output voltage collapses, preventing uncontrolled restart |
Pinout & Package
UCC2817AD is housed in a 16-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power & signal reference | Common return for VCC bypass, current sense, and internal amplifiers; requires low-inductance 0.1 µF ceramic cap |
| 2 PKLMT | Peak current limit input | Sense resistor voltage level-shifted to 0 V threshold; triggers current limiting when signal drops below 0 V |
| 3 CAOUT | Current amplifier output | Drives PWM latch; connects to compensation network between CAOUT and MOUT for stability |
| 4 CAI | Current amp non-inverting input | Connects to GND-side of current sense resistor; operates down to –0.5 V for bidirectional sensing |
| 5 MOUT | Multiplier output / current amp inverting input | High-impedance node carrying IAC × (VAOUT – 1)/VFF²; enables differential current-mode control |
| 6 IAC | Line voltage proportional current | Accepts ≤500 µA current from rectified AC line; sets multiplier gain and distortion performance |
| 7 VAOUT | Voltage amplifier output | Regulates boost output; clamped to ~5.5 V max; feeds zero-power comparator at 0.33 V trip point |
| 8 VFF | Feed-forward voltage | 1.4 V at low line / 4.7 V at high line - scales multiplier gain to maintain constant power across input range |
| 9 VREF | Reference output | 7.5 V ±1.5%, 20 mA capable - used for PKLMT biasing, OVP threshold, and external analog circuitry |
| 10 OVP/EN | Overvoltage protect / enable | Window comparator: disables DRVOUT if >8.0 V (OVP) or <1.9 V (disable/reset soft-start) |
| 11 SSENSE | Voltage amp inverting input | Connected to output voltage divider; sets regulated output voltage (e.g., 385 V with 51:1 ratio) |
| 12 RT | Oscillator timing current | 10–100 kΩ resistor sets charging current; nominal 3 V bias enables precise frequency programming |
| 13 SS | Soft-start control | Internal 10 µA current source charges external cap; linearly ramps duty cycle during startup |
| 14 CT | Oscillator timing capacitor | Capacitor to GND sets frequency per f ≈ 0.6/(RT × CT); requires short, low-inductance trace |
| 15 VCC | Supply voltage input | 12–18 V input; 4–6 mA operating current; UVLO ensures no switching until ≥16 V is reached |
| 16 DRVOUT | Gate driver output | Totem-pole MOSFET driver; ±1.2 A peak; requires series gate resistor (e.g., 11 Ω) to damp ringing |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | 90 dB current amplifier gain and low 0–2.5 mV input offset enable <5% THD line current even at light load |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC converter to reduce bulk capacitor ripple current and extend lifetime |
| Feed-forward line regulation | VFF input scales multiplier gain with RMS line voltage, maintaining constant power and improving transient response |
| Low start-up current | 150 µA typical UVLO current allows direct bootstrapping from high-voltage rail without auxiliary winding |
| Integrated OVP & zero-power detect | Dual protection: OVP trips at 8.0 V (VREF + 0.5 V), zero-power disables switching when VAOUT < 0.33 V |
Applications
| PC Power Supplies | Consumer Electronics Adapters |
|---|---|
|
Use Scenario: 250 W ATX main power supply with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: UCC2817AD controls boost PFC stage to shape input current, regulate 385 V DC bus, and meet IEC 61000-3-2 Class D harmonic limits. Use Value: Enables >95% efficiency and >0.99 power factor at full load while operating reliably from –40°C to +85°C ambient. |
Use Scenario: 150 W laptop adapter with active PFC front-end and LLC resonant secondary. IC Role / Device Role / Timing Role: UCC2817AD regulates boost output and coordinates leading-edge modulation with LLC controller to minimize bulk capacitor stress. Use Value: Reduces 100/120 Hz ripple current by 30% versus trailing-edge schemes, extending 105°C electrolytic capacitor life by 2×. |
| Industrial LED Drivers | IEC 61000-3-2 Compliant Lighting |
|
Use Scenario: 200 W outdoor LED streetlight driver with wide input range and thermal derating. IC Role / Device Role / Timing Role: UCC2817AD manages boost PFC under variable line conditions and interfaces with isolated flyback dimming control. Use Value: Maintains >0.95 PF across –40°C to +85°C and supports programmable soft-start to avoid inrush into cold LEDs. |
Use Scenario: 250 W commercial fluorescent replacement ballast with digital control and DALI interface. IC Role / Device Role / Timing Role: UCC2817AD provides regulated DC bus for downstream half-bridge inverter and communicates fault status via OVP/EN pin. Use Value: Integrated OVP and zero-power detection eliminate need for external supervisor IC, reducing BOM count by 2 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2818AD | UVLO turn-on at 10.2 V (vs 16 V); no internal shunt regulator; requires fixed VCC supply | Better suited for designs with dedicated 12 V bias rail; not compatible with bootstrap configurations | Select UCC2818AD only when VCC is stable and independent of boost output voltage |
| UC3854BDW | Analog peak-current-mode controller; higher 250 µA start-up current; no integrated OVP or zero-power detect | Requires external OVP comparator and soft-start circuit; less integration but wider legacy support | Choose UC3854BDW for cost-sensitive, lower-volume designs where external component count is acceptable |
Compared with UCC2817AD, UCC2818AD eliminates bootstrap capability but simplifies bias design, while UC3854BDW offers broader industry familiarity at the cost of added external components and reduced protection integration.
Availability
UCC2817AD is available at Aetrix Electronics and suitable for PC power supplies, industrial LED drivers, consumer electronics adapters, and IEC 61000-3-2 compliant lighting requiring stable component supply across extended temperature ranges.
Supply support for UCC2817AD 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 technologies, with decades of leadership in power conversion ICs.
The UCC2817A family was designed specifically for high-efficiency, average current-mode boost PFC preregulators targeting industrial, computing, and consumer power supplies up to 300 W.
FAQ
What is the UVLO threshold for UCC2817AD?
The UCC2817AD features an undervoltage lockout with a turn-on threshold of 15.4 V to 16.6 V (typical 16 V) and a turn-off threshold of 9.4 V to 9.7 V, providing 5.8–6.3 V hysteresis. This ensures reliable startup from high-voltage rails and prevents erratic operation during brownouts. The UCC2817AD's UVLO behavior is distinct from the UCC2818AD, which turns on at 9.7–10.8 V.
How does UCC2817AD implement zero-power detection?
The UCC2817AD monitors VAOUT with an internal comparator that trips when VAOUT falls below 0.33 V (min 0.2 V, max 0.5 V), forcing DRVOUT low and halting switching. This protects downstream circuits during output short-circuit or bulk capacitor failure. Unlike basic enable pins, this function is fully integrated and requires no external components - a key differentiator of the UCC2817AD over older PFC controllers.
Can UCC2817AD be used in critical conduction mode (CRM)?
Yes, the UCC2817AD supports both continuous conduction mode (CCM) and transition mode (CRM) via external compensation and oscillator configuration. Its average current-mode architecture and high-bandwidth current amplifier (2.5–7 MHz GBW) allow stable CRM operation up to 300 W. However, CRM implementation requires careful RT/CT selection and current-sense network tuning - details are provided in TI's SLUA404 application note for UCC2817AD.
What is the purpose of the VFF pin on UCC2817AD?
The VFF (voltage feed-forward) pin on UCC2817AD accepts a scaled RMS representation of the AC line voltage (1.4 V at low line, 4.7 V at high line) to dynamically adjust the multiplier gain. This maintains constant power delivery and improves line transient response without altering loop compensation. In UCC2817AD designs, VFF is generated using a simple RC filter and current mirror from the IAC pin - eliminating need for external op-amps or dividers.
Does UCC2817AD require external components for OVP protection?
No, UCC2817AD includes fully integrated overvoltage protection triggered at VREF + 0.50 V (≈8.0 V) with 300–600 mV hysteresis. The OVP/EN pin serves dual function: it disables DRVOUT when voltage exceeds threshold, and also resets soft-start when pulled below 1.9 V. This eliminates need for external comparators, references, or resistive dividers - a core integration advantage of the UCC2817AD over discrete OVP solutions.
UCC2817AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UCC2817AD FAQ
1.How can I place an order for UCC2817AD through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2817AD 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 UCC2817AD reliable?
The price and inventory of UCC2817AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2817AD is usually 5 days.
3.What payment methods are accepted for UCC2817AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2817AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2817AD?
UCC2817AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2817AD 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 UCC2817AD?
For technical support, including UCC2817AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2817AD requirements.
6.How does Aetrix verify that UCC2817AD is sourced from the original manufacturer or authorized distributors?
All UCC2817AD 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 UCC2817AD meets industry standards.
7.What is the process for return or replacement of UCC2817AD?
All UCC2817AD units undergo pre-shipment inspection (PSI). If there is an issue with UCC2817AD, 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 UCC2817AD part is unused and in its original packaging.
Return procedure for UCC2817AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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