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Texas Instruments UCC3817DW
- Part No.:
- UCC3817DW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC3817DW.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,321
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Product details
Overview
UCC3817DW from Texas Instruments is a BiCMOS active power factor correction (PFC) controller for boost preregulators, implementing average current-mode control to achieve near-unity power factor and low line current distortion. It features a 7.5-V reference, 16-V UVLO turn-on threshold, leading-edge PWM modulation, and integrated gate driver delivering up to 1.2-A peak sink current - used in IEC61000-3-2-compliant sub-300-W AC/DC supplies.
For engineers reviewing the UCC3817DW datasheet, UCC3817DW pinout, UCC3817DW application, or UCC3817DW equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative options, and supply-chain support for industrial and computing power designs.
Technical Context
The UCC3817DW uses an analog multiplier with three inputs - VAOUT (voltage error signal), IAC (line-voltage-proportional current), and VFF (feed-forward RMS voltage) - to generate a current-mode command signal at MOUT. Its average current-mode architecture maintains stable sinusoidal input current even under wide line and load variations.
It integrates a 7.5-V precision reference (±1.5% over temperature), a zero-power comparator with 0.33-V threshold on VAOUT, and a totem-pole gate driver with 5–12-Ω pullup/pulldown resistance. UVLO operates at 16 V turn-on / 9.7 V turn-off with 6.3-V hysteresis, supporting reliable startup across global AC mains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-On | 16 V - ensures reliable startup only after sufficient bulk capacitor charge; prevents erratic operation during brownout |
| Reference Voltage | 7.5 V ±1.5% - provides stable bias for feedback networks and external circuitry; supports 20-mA load capability |
| Oscillator Frequency Range | 6 kHz to 220 kHz - programmable via RT/CT; enables optimization of EMI, efficiency, and magnetics size |
| Gate Drive Sink Current | 1.2 A - directly drives medium-power MOSFET gates without external buffers; reduces BOM count |
| Current Amplifier Offset | ±2 mV - minimizes light-load current-sense error, preserving THD performance below 20% load |
| Operating Temperature | 0°C to 70°C - specified commercial-grade range; distinct from UCC2817's –40°C to 85°C industrial rating |
| Multiplier Gain Constant K | 1/V - enables accurate feed-forward scaling of line voltage to maintain constant power limit across input range |
Pinout & Package
UCC3817DW is housed in a 16-pin SOIC (DW) package measuring 7.5 mm × 10.3 mm, optimized for surface-mount assembly and thermal dissipation in compact power stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference | Common return for all internal circuits; requires direct 0.1-μF ceramic bypass to minimize noise coupling |
| PKLMT (2) | Peak current limit input | Accepts level-shifted current-sense signal; triggers shutdown when voltage falls below 0 V |
| CAOUT (3) | Current amplifier output | Drives compensation network between CAOUT and MOUT; sets PFC duty cycle based on sensed line current |
| CAI (4) | Current amplifier noninverting input | Connects to ground side of sense resistor; operates down to –0.5 V for bidirectional sensing capability |
| MOUT (5) | Multiplier output & current amp inverting input | High-impedance node combining multiplier current and amp feedback; enables differential configuration for noise immunity |
| IAC (6) | Line voltage proportional current input | Accepts up to 500 μA current derived from rectified AC line; core input for feed-forward distortion reduction |
| VAOUT (7) | Voltage error amplifier output | Regulates boost output voltage; clamped at ~5.5 V to prevent overshoot during transients |
| VFF (8) | Feed-forward RMS voltage | Generated by mirroring half of IAC; 1.4 V at low line ensures proper power scaling and THD control |
| VREF (9) | 7.5-V precision reference output | Stable bias source for external circuits; disabled below UVLO; requires 0.1-μF ceramic bypass |
| OVP/EN (10) | Overvoltage protection & enable input | Window comparator: disables driver above programmed OVP threshold or forces reset if pulled below 1.9 V |
| VSENSE (11) | Voltage amplifier inverting input | Connected to output divider; forms feedback loop with VAOUT to regulate DC bus voltage |
| RT (12) | Oscillator timing resistor connection | Programs charging current; 10–100 kΩ recommended; nominal 3-V bias enables frequency stability |
| SS (13) | Soft-start control | Charges external capacitor to ramp duty cycle; discharges rapidly during VCC dropout to prevent fault propagation |
| CT (14) | Oscillator timing capacitor connection | Defines switching frequency per f ≈ 0.6/(RT × CT); short GND trace required for jitter reduction |
| VCC (15) | Supply voltage input | 10–17 V operating range; powers internal logic and gate driver; must deliver ≥20 mA with local 0.1-μF bypass |
| DRVOUT (16) | Integrated MOSFET gate driver output | Totem-pole output driving boost switch; 25-ns rise/10-ns fall time into 1-nF load; requires series gate resistor |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal line current across universal AC input (85–265 VAC) without slope compensation |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC stage to reduce bulk capacitor ripple current, extending electrolytic lifetime |
| 7.5-V reference with ±2-mV offset amplifier | Supports high-accuracy voltage regulation and precise current limiting; maintains <5% THD at light loads |
| Integrated 1.2-A gate driver | Eliminates need for external driver IC or discrete buffer transistors; reduces layout complexity and component count |
| Worldwide line operation support | UVLO and feed-forward architecture allow seamless operation from 85 VAC to 265 VAC without hardware changes |
| Overvoltage protection with hysteresis | 500-mV OVP hysteresis prevents oscillation during transient overvoltage events; protects downstream converters |
Applications
| PC Power Supply | Industrial AC/DC Converter |
|---|---|
|
Use Scenario: 200–300 W ATX-compatible power supply complying with IEC61000-3-2 Class D limits. IC Role / Device Role / Timing Role: Primary PFC controller shaping input current to match AC voltage waveform using average current-mode control. Use Value: Achieves <5% THD at full load and >0.99 power factor across 85–265 VAC, meeting regulatory requirements without auxiliary filtering. |
Use Scenario: DIN-rail mounted 240 W industrial power module requiring robust operation from –20°C to +60°C ambient. IC Role / Device Role / Timing Role: Boost-stage PFC controller with UVLO hysteresis and feed-forward line regulation for stable output under fluctuating grid conditions. Use Value: Maintains regulated 380-V DC bus with <3% regulation error across line and load; reduces input filter size by 40% vs passive PFC. |
| LED Driver Front-End | Consumer Audio Power Supply |
|
Use Scenario: High-efficiency constant-current LED driver for commercial lighting with universal AC input. IC Role / Device Role / Timing Role: Active PFC preregulator preceding LLC resonant converter; provides clean 380-V DC bus. Use Value: Enables >92% system efficiency at 230 VAC; eliminates audible transformer hum by eliminating 100/120 Hz ripple on DC bus. |
Use Scenario: Premium AV receiver power supply requiring low-noise, low-EMI operation in shared residential environments. IC Role / Device Role / Timing Role: PFC controller implementing leading-edge modulation synchronized to downstream half-bridge to suppress common-mode noise. Use Value: Reduces conducted EMI by 12 dB in 150 kHz–30 MHz band; meets FCC Part 15 Class B without added shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817DW | Rated for –40°C to +85°C; 10.2-V UVLO turn-on; lower start-up current (150 μA typical) | Better suited for industrial environments with extended temperature cycling and cold-start requirements | Select UCC2817DW when operating outside 0°C–70°C or requiring tighter UVLO hysteresis (0.5 V vs 6.3 V) |
| FAN7930C | Fixed-frequency CCM controller; no integrated gate driver; requires external MOSFET driver; 12.5-V UVLO | Lacks leading-edge modulation and average current-mode; higher THD at light load | Choose FAN7930C only for cost-sensitive, fixed-line applications where THD <8% is acceptable and layout space allows external driver |
Compared with UCC2817DW and FAN7930C, the UCC3817DW offers superior light-load THD control and integrated gate drive - reducing component count and improving reliability in universal-input PC and industrial power supplies - while trading off extended temperature range for lower system cost.
Availability
UCC3817DW is available at Aetrix Electronics and suitable for PC power supplies, industrial AC/DC converters, LED driver front-ends, and consumer audio power systems requiring stable component supply and long-term manufacturability.
Supply support for UCC3817DW 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in power conversion ICs.
The UCC3817DW belongs to TI's BiCMOS PFC controller product line, designed specifically for cost-effective, high-performance active power factor correction in sub-300-W universal-input AC/DC power supplies.
FAQ
What is the UVLO behavior of the UCC3817DW?
The UCC3817DW features undervoltage lockout with a 16-V turn-on threshold and 9.7-V turn-off threshold, yielding 6.3-V hysteresis. This ensures robust startup after bulk capacitor charging and prevents oscillatory operation during brownouts. The UVLO circuit remains active throughout operation, disabling the DRVOUT driver whenever VCC drops below the lower threshold - a critical safeguard in unstable AC line conditions. The UCC3817DW's UVLO is distinct from the UCC2817DW's 10.2-V turn-on, reflecting its commercial-temperature targeting.
How does the UCC3817DW implement average current-mode control?
The UCC3817DW implements average current-mode control through its dual-amplifier architecture: the current amplifier compares CAI (line-current-derived voltage) against a command signal derived from the multiplier output at MOUT, while the voltage amplifier (via VSENSE/VAOUT) regulates output voltage. This closed-loop structure continuously shapes the input current waveform to match the AC line voltage, achieving near-unity power factor without external slope compensation. The UCC3817DW's ±2-mV current amplifier offset ensures accuracy down to light loads, maintaining <5% THD even at 10% rated power.
Can the UCC3817DW drive a 600-V MOSFET directly?
Yes, the UCC3817DW's DRVOUT pin provides a totem-pole gate driver capable of sourcing up to 900 mA and sinking up to 1.2 A, sufficient to drive standard 600-V superjunction MOSFETs used in boost PFC stages. However, a series gate resistor (typically 10–22 Ω, calculated per TI's Figure 6) is mandatory to damp ringing and prevent shoot-through. The UCC3817DW's 25-ns rise and 10-ns fall times into 1-nF load ensure fast, controlled switching - but layout must minimize parasitic inductance between DRVOUT, gate resistor, and MOSFET gate.
What is the role of the VFF pin on the UCC3817DW?
The VFF pin on the UCC3817DW delivers a feed-forward RMS voltage derived from half the IAC current, scaled to 1.4 V at low line (85 VAC) and ~4.7 V at high line (265 VAC). This signal dynamically adjusts the multiplier gain to maintain constant power limit across the universal input range - preventing overcurrent at low line and underutilization at high line. Unlike open-loop feed-forward, the UCC3817DW's VFF path is internally calibrated and temperature-compensated, enabling <3% power variation from 85–265 VAC without trimming.
Does the UCC3817DW support discontinuous conduction mode (DCM)?
No, the UCC3817DW is designed exclusively for continuous conduction mode (CCM) boost PFC operation. Its average current-mode architecture, oscillator design, and internal compensation are optimized for CCM stability and low THD across full load range. While boundary conduction mode (BCM) controllers like the UCC28070 offer higher light-load efficiency, the UCC3817DW prioritizes low distortion and predictable EMI signature in CCM - making it ideal for fixed-frequency, high-power-density applications where consistent ripple current and thermal profile are critical.
UCC3817DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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-SOIC
UCC3817DW FAQ
1.How can I place an order for UCC3817DW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3817DW 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 UCC3817DW reliable?
The price and inventory of UCC3817DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3817DW is usually 5 days.
3.What payment methods are accepted for UCC3817DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3817DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3817DW?
UCC3817DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3817DW 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 UCC3817DW?
For technical support, including UCC3817DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3817DW requirements.
6.How does Aetrix verify that UCC3817DW is sourced from the original manufacturer or authorized distributors?
All UCC3817DW 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 UCC3817DW meets industry standards.
7.What is the process for return or replacement of UCC3817DW?
All UCC3817DW units undergo pre-shipment inspection (PSI). If there is an issue with UCC3817DW, 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 UCC3817DW part is unused and in its original packaging.
Return procedure for UCC3817DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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