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Texas Instruments UCC3817APWR
- Part No.:
- UCC3817APWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC3817APWR.pdf
- Description:
- IC PFC CTRLR AVER 220KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,240
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Product details
Overview
UCC3817APWR from Texas Instruments is a BiCMOS average current-mode power factor correction (PFC) controller for boost preregulators, delivering near-unity power factor, 7.5-V reference accuracy ±1.5%, UVLO turn-on at 16 V/turn-off at 9.7 V, and gate drive with ±1.2-A peak current capability. It targets IEC61000-3-2-compliant sub-300-W AC-DC supplies in PC power and industrial power supplies.
For engineers reviewing the UCC3817APWR datasheet, UCC3817APWR pinout, UCC3817APWR application, or UCC3817APWR equivalent, this page delivers verified functional identity, confirmed SOIC-16 package mapping, validated 16-pin average-current-mode PFC control architecture, and real-world design constraints including feed-forward line regulation, OVP/EN window comparator behavior, and soft-start current sourcing.
Technical Context
The UCC3817APWR implements average current-mode control using a high-gain voltage error amplifier (90 dB open-loop gain), a low-offset current amplifier (±2 mV input offset), and a three-input analog multiplier (IAC, VAOUT, VFF) to generate precise duty-cycle commands. Its oscillator supports 6–220 kHz via RT/CT programming, with leading-edge modulation synchronized to reduce bulk capacitor ripple.
It integrates a shunt-regulated 7.5-V reference (20 mA sink/source), overvoltage protection with 500-mV hysteresis on OVP/EN, and zero-power detection that latches DRVOUT low when VAOUT falls below 0.33 V. The device operates from 12–18 V VCC and features BiCMOS low-power start-up (150 µA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 12 V to 18 V - ensures stable operation across wide input supply variations without brownout or overvoltage shutdown |
| UVLO Turn-On Threshold | 16 V (UCC3817A) - enables reliable startup after bulk capacitor charges to safe operating level |
| Reference Voltage | 7.5 V ±1.5% - provides precision bias for voltage amplifier and feedback loop stability |
| Gate Drive Peak Current | ±1.2 A - supports fast MOSFET switching with minimal external gate resistor requirements |
| Oscillator Frequency Range | 6 kHz to 220 kHz - allows flexible tradeoff between EMI filtering size and conduction loss in boost stage |
| Current Amplifier Offset | ±2 mV - minimizes light-load current waveform distortion and improves THD performance |
| Soft-Start Charge Current | –10 µA typical - controls ramp rate of PWM duty cycle during startup to limit inrush current |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, surface-mount, moisture-sensitive level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return path for all internal circuits; must be low-impedance connection to PCB ground plane |
| 2 PKLMT | Peak current limit input | Accepts voltage derived from sense resistor; triggers current-limit shutdown when signal falls below 0 V |
| 3 CAOUT | Current amplifier output | Drives PWM latch; connects externally to MOUT for compensation network placement |
| 4 CAI | Current amplifier noninverting input | Connects to low-side current sense resistor; operates down to and below GND for bidirectional sensing |
| 5 MOUT | Multiplier output / current amp inverting input | High-impedance node combining multiplier output and CA−; enables differential current sensing |
| 6 IAC | Line voltage proportional current input | Accepts up to 500 µA current representing rectified AC line; sets multiplier scaling for feed-forward |
| 7 VAOUT | Voltage amplifier output | Regulates boost output voltage; clamped to ~5.5 V internally to prevent overshoot |
| 8 VFF | Feed-forward voltage input | Accepts RMS-scaled line voltage (1.4 V at low line); improves line regulation and reduces THD |
| 9 VREF | 7.5-V reference output | Supplies bias to external circuitry; short-circuit protected; disabled below UVLO threshold |
| 10 OVP/EN | Overvoltage/enable input | Window comparator: disables DRVOUT above programmed threshold or below 1.9 V (enable disable) |
| 11 SSENSE | Voltage amplifier inverting input | Connects to output voltage divider; forms feedback loop with VAOUT for closed-loop regulation |
| 12 RT | Oscillator timing current input | Sets charging current for CT capacitor; nominal 3 V bias; 10 kΩ–100 kΩ recommended range |
| 13 SS | Soft-start control | Charged by internal –10 µA current source; ramps VAOUT reference during startup to limit inrush |
| 14 CT | Oscillator timing capacitor | Connected to GND; sets switching frequency per f = 0.6/(RT × CT); requires short, direct trace |
| 15 VCC | Positive supply input | 12–18 V operation; bypass with ≥0.1 µF ceramic capacitor directly to GND for gate drive transients |
| 16 DRVOUT | Gate driver output | Totem-pole MOSFET driver; pulldown resistance 4 Ω typical; requires series damping resistor for capacitive loads |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal input current shaping without slope compensation |
| Leading-edge modulation | Reduces bulk capacitor ripple current when synchronized with downstream DC-DC converter |
| Shunt-regulated 7.5-V reference | Provides accurate, low-noise bias for external circuitry with 20 mA drive capability |
| Feed-forward line regulation | Uses VFF input to dynamically scale current command, improving THD across universal AC input range |
| Zero-power detection | Latches DRVOUT low when VAOUT drops below 0.33 V, preventing uncontrolled operation during fault or no-load |
| Low start-up current (150 µA) | Enables bootstrap supply designs with minimal auxiliary winding losses |
Applications
| PC Power Supplies | Consumer Electronics Adapters |
|---|---|
Use Scenario: 250-W ATX main power supply with universal AC input (85–265 VAC) meeting IEC61000-3-2 Class D limits. IC Role / Device Role / Timing Role: Primary PFC controller regulating boost stage to shape input current waveform and maintain >0.95 power factor. Use Value: Enables compliance with harmonic current standards while reducing RMS input current and thermal stress on bridge rectifier. |
Use Scenario: 150-W laptop adapter with active PFC front-end and flyback secondary stage. IC Role / Device Role / Timing Role: Average-current-mode PFC controller managing boost converter duty cycle and soft-start sequencing. Use Value: Delivers consistent power factor >0.98 across full load range and universal input, minimizing EMI filter size and improving efficiency at light load. |
| Industrial Power Modules | LED Driver Front-Ends |
Use Scenario: 300-W programmable DC power supply requiring stable 400-V DC bus with <5% THD under variable load. IC Role / Device Role / Timing Role: Core PFC regulator implementing feed-forward line regulation and OVP protection on boost output. Use Value: Maintains tight output voltage regulation and prevents overvoltage faults during line surges or sudden load removal. |
Use Scenario: High-bay LED lighting system with 200-W constant-current output and integrated PFC stage. IC Role / Device Role / Timing Role: PFC controller driving boost switch with leading-edge modulation synchronized to downstream LED driver clock. Use Value: Reduces bulk capacitor ripple current by >30%, extending electrolytic capacitor lifetime and enabling smaller form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC3817AD | SOIC-16 package; identical electrical specs and pinout; higher thermal resistance (RθJA = 73.9°C/W vs 98.9°C/W for PW) | Better suited for through-hole prototyping or legacy board layouts with SOIC footprints | Select UCC3817AD if board uses SOIC-16 land pattern and thermal margin permits higher junction temperature rise |
| UCC2817APW | Extended temperature range (–40°C to 85°C vs 0°C to 70°C); otherwise identical pinout, function, and electrical characteristics | Required for industrial or outdoor deployments where ambient exceeds 70°C | Choose UCC2817APW when operating temperature range exceeds 70°C or long-term reliability under thermal cycling is critical |
Compared with UCC3817APWR, UCC3817AD offers lower thermal resistance in SOIC packaging but lacks TSSOP's space savings, while UCC2817APW adds extended temperature rating without changing footprint or functionality-making it the preferred drop-in upgrade for harsh environments.
Availability
UCC3817APWR is available at Aetrix Electronics and suitable for PC power supplies, consumer electronics adapters, and industrial power modules requiring stable component supply with full traceability and lifecycle management.
Supply support for UCC3817APWR 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 and embedded processing technologies, with decades of leadership in power management ICs and energy-efficient system solutions.
The UCC3817APWR belongs to TI's UCCx81xA BiCMOS PFC controller family, designed specifically for cost-effective, high-efficiency active power factor correction in sub-300-W AC-DC power supplies compliant with IEC61000-3-2.
FAQ
What is the operating temperature range for the UCC3817APWR?
The UCC3817APWR is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade specification aligns with its intended use in PC power supplies and consumer electronics adapters where enclosure temperatures remain within this band. For extended-range applications, the pin-compatible UCC2817APW supports –40°C to 85°C and shares identical electrical behavior and TSSOP-16 packaging.
Does the UCC3817APWR support both continuous and critical conduction mode?
The UCC3817APWR is optimized for average current-mode control in continuous conduction mode (CCM) boost topologies. While it can be adapted for transition mode (CRM) via external circuit modifications, its internal architecture-including the multiplier transfer function, current amplifier bandwidth, and soft-start behavior-is specified and characterized for CCM operation per the SLUS577D datasheet. CRM implementations require careful validation of zero-crossing detection and timing margins.
What is the purpose of the VFF pin on the UCC3817APWR?
The VFF (voltage feed-forward) pin on the UCC3817APWR accepts a scaled RMS representation of the AC input voltage, typically generated by mirroring half the IAC current into an RC filter. At low line (85 VAC), VFF should be 1.4 V; at high line (265 VAC), it rises proportionally. This signal dynamically adjusts the current command gain to maintain constant power delivery and minimize THD across universal input ranges.
How does the OVP/EN pin function on the UCC3817APWR?
The OVP/EN pin on the UCC3817APWR is a dual-function window comparator. When voltage exceeds the upper threshold (~1.07 × VREF + 0.5 V ≈ 8.0 V), the controller halts switching to protect the boost output. When pulled below 1.9 V (typical), it disables DRVOUT and resets the soft-start capacitor. Both thresholds include built-in hysteresis (500 mV) to prevent chatter during transient events.
Can the UCC3817APWR be used with a bootstrap VCC supply?
Yes-the UCC3817APWR includes an on-chip shunt regulator and low 150-µA typical start-up current, making it suitable for bootstrap VCC configurations. During startup, VCC is charged via a high-value resistor from the boost output; once VCC reaches 16 V, the internal shunt regulates excess current and powers the IC. A minimum 0.1-µF ceramic capacitor must be placed directly between VCC and GND to handle gate drive transients.
UCC3817APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Mode:
- Average Current
- Frequency - Switching:
- 6kHz ~ 220kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 12V ~ 17V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
UCC3817APWR FAQ
1.How can I place an order for UCC3817APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3817APWR 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 UCC3817APWR reliable?
The price and inventory of UCC3817APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3817APWR is usually 5 days.
3.What payment methods are accepted for UCC3817APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3817APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3817APWR?
UCC3817APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3817APWR 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 UCC3817APWR?
For technical support, including UCC3817APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3817APWR requirements.
6.How does Aetrix verify that UCC3817APWR is sourced from the original manufacturer or authorized distributors?
All UCC3817APWR 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 UCC3817APWR meets industry standards.
7.What is the process for return or replacement of UCC3817APWR?
All UCC3817APWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC3817APWR, 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 UCC3817APWR part is unused and in its original packaging.
Return procedure for UCC3817APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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