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Texas Instruments UCC3817DG4
- Part No.:
- UCC3817DG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC3817DG4.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,129
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Product details
Overview
UCC3817DG4 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 with 0.2-A continuous output. Used in IEC61000-3-2-compliant sub-300-W AC/DC supplies.
For engineers reviewing the UCC3817DG4 datasheet, UCC3817DG4 pinout, UCC3817DG4 application, or UCC3817DG4 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support for industrial and consumer power supply development.
Technical Context
The UCC3817DG4 implements average current mode control using a high-bandwidth current amplifier (CAI/MOUT inputs, CAOUT output) and a three-input analog multiplier (IAC, VFF, VAOUT) to shape input current waveform in phase with rectified line voltage. Its zero-power comparator monitors VAOUT to disable switching below 0.33 V, enabling light-load efficiency.
It integrates a 7.5-V precision reference (±1.5% over temperature), UVLO with 16 V/10 V hysteresis, OVP/EN window comparator (1.9 V enable threshold, ±500 mV hysteresis), and a totem-pole gate driver (DRVOUT) with 5–12 Ω pull-up/pull-down resistance and <50 ns rise/fall times into 1 nF load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-On | 16 V - Ensures reliable startup only after bulk capacitor reaches safe operating voltage; prevents erratic operation during brownout. |
| VREF Output | 7.5 V ±1.5% - Supplies stable bias for external compensation networks and sense circuitry; capable of sourcing 20 mA. |
| Oscillator Frequency Range | 6 kHz to 220 kHz - Set via RT/CT; enables optimization of EMI, magnetics size, and efficiency across universal-input designs. |
| Gate Drive Current | 0.2 A continuous, 1.2 A peak - Directly drives MOSFET gates without external buffers; supports fast switching up to 200 kHz. |
| Current Amplifier Offset | ±2 mV - Minimizes current-sense error at light loads, preserving THD performance and PFC accuracy down to 10% load. |
| Soft-Start Charge Current | −10 µA typical - Controls ramp rate of SS pin voltage to limit inrush current and prevent output overshoot during startup. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade power supply applications including PC and consumer electronics. |
Pinout & Package
UCC3817DG4 is housed in a 16-pin SOIC (D) package measuring 3.91 mm × 9.9 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| 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 VCC/VREF for noise immunity. |
| PKLMT (2) | Peak current limit input | Accepts level-shifted current-sense signal; triggers shutdown when voltage falls below 0 V - sets maximum switch current. |
| CAOUT (3) | Current amplifier output | Drives PWM latch; connects to MOUT for compensation network - determines duty cycle based on sensed line current. |
| CAI (4) | Current amplifier non-inverting input | Connects to ground side of current-sense resistor; operates down to −0.5 V - enables bidirectional sensing and low-side placement. |
| MOUT (5) | Multiplier output / CA inverting input | High-impedance node combining multiplier current and CA feedback; enables differential configuration for noise rejection. |
| IAC (6) | Line voltage proportional current input | Receives scaled rectified line current (≤500 µA); primary feedforward path for input voltage tracking in multiplier. |
| VAOUT (7) | Voltage error amplifier output | Regulates boost output voltage; clamped at 5.5 V to prevent overshoot; feeds VFF and multiplier for feedforward control. |
| VFF (8) | Feed-forward RMS voltage | Generated by mirroring half of IAC; scales multiplier gain with line voltage - maintains constant power limit across 85–265 VAC. |
| VREF (9) | 7.5-V precision reference output | Powers external circuits and bias networks; disabled below UVLO; short-circuit protected - eliminates need for external reference. |
| OVP/EN (10) | Overvoltage protection / enable input | Window comparator: disables DRVOUT if boost voltage exceeds VREF+0.5 V, or resets soft-start if pulled below 1.9 V. |
| VSENSE (11) | Voltage amplifier inverting input | Connects to output divider; forms feedback loop with VAOUT - sets regulated DC bus voltage (e.g., 385 V for universal input). |
| RT (12) | Oscillator timing current input | Sets charging current for CT capacitor; 22 kΩ yields ~100 kHz - determines switching frequency and ripple trade-offs. |
| SS (13) | Soft-start control | Charges external capacitor with −10 µA current; used as voltage error signal during startup - prevents inrush and overshoot. |
| CT (14) | Oscillator timing capacitor | With RT, sets fSW ≈ 0.6/(RT×CT); requires short, direct GND trace to minimize jitter and EMI coupling. |
| VCC (15) | Supply voltage input | 10–17 V operation; powers internal circuitry and gate driver; must be bypassed locally to GND - enables self-bias from boost rail. |
| DRVOUT (16) | Integrated MOSFET gate driver output | Totem-pole output driving boost switch gate; requires series gate resistor (≥11 Ω @ 18 V) to damp ringing and limit peak current. |
Key Features
| Feature | Design Value |
|---|---|
| Average current mode control | Enables stable, low-distortion sinusoidal line current without slope compensation - meets IEC61000-3-2 Class D THD limits. |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC converter to reduce bulk capacitor ripple current - extends capacitor lifetime in two-stage supplies. |
| Integrated 7.5-V reference | ±1.5% accuracy over 0°C to +70°C; 20-mA drive capability - eliminates external reference IC and reduces BOM count. |
| BiCMOS process technology | Reduces start-up current to 150 µA and quiescent dissipation - improves no-load efficiency and enables smaller hold-up capacitors. |
| Overvoltage protection with hysteresis | 1.9 V enable threshold and 500 mV hysteresis on OVP/EN pin - provides robust output overvoltage shutdown without external comparators. |
Applications
| PC Power Supply | LED Driver Input Stage |
|---|---|
|
Use Scenario: 200–300 W ATX-compatible power supply with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: Primary PFC controller regulating boost stage to deliver stable 385 VDC bus with >0.99 PF. Use Value: Meets IEC61000-3-2 Class D harmonic limits; reduces upstream filter size and EMI filtering cost. |
Use Scenario: High-efficiency constant-current LED driver for commercial lighting with dimmable input. IC Role / Device Role / Timing Role: Active PFC front-end preceding LLC resonant converter - shapes input current to match line voltage. Use Value: Enables TRIAC-dimmable LED drivers to pass EN61000-3-2 without derating; supports 10–100% dimming range. |
| Industrial AC/DC Module | Consumer Audio Power Supply |
|
Use Scenario: DIN-rail mounted 250 W industrial power module for PLC I/O and sensors. IC Role / Device Role / Timing Role: PFC controller managing boost preregulator under wide ambient temperature (0°C to +70°C). Use Value: Maintains >0.95 PF across full load and line range; supports long-term reliability in unventilated enclosures. |
Use Scenario: Premium AV receiver with multi-rail output (±15 V, +5 V, +3.3 V) and low-noise requirements. IC Role / Device Role / Timing Role: Low-noise PFC controller using average current mode and leading-edge modulation. Use Value: Reduces 100/120 Hz ripple on main DC bus - lowers conducted EMI and improves downstream regulator PSRR. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817DG4 | Same pinout and function; rated for −40°C to +85°C industrial temperature range; higher UVLO (16 V) and tighter VREF tolerance (±1.3%). | Preferred for extended-temperature industrial or telecom power supplies requiring wider thermal margin. | Select UCC2817DG4 when operating ambient exceeds +70°C or when tighter reference stability is required. |
| ICE2PCS01G | Fixed-frequency CCM controller; no integrated gate driver; requires external MOSFET driver; different pinout and compensation architecture. | Used in cost-sensitive, fixed-line-voltage applications where average current mode is not mandatory. | Choose ICE2PCS01G only when redesigning layout and compensation; not drop-in compatible with UCC3817DG4. |
Compared with UCC2817DG4 and ICE2PCS01G, the UCC3817DG4 offers commercial-temperature-optimized performance with integrated gate drive and proven average current mode stability - reducing component count and simplifying compliance testing for sub-300-W systems.
Availability
UCC3817DG4 is available at Aetrix Electronics and suitable for PC power supplies, LED driver input stages, industrial AC/DC modules, and consumer audio power supplies requiring stable component supply and full production traceability.
Supply support for UCC3817DG4 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 leadership in power management ICs and industrial-grade controllers.
The UCC3817DG4 belongs to TI's UCCx817 family of BiCMOS PFC controllers, designed specifically for cost-effective, high-efficiency boost preregulators in universal-input, IEC61000-3-2-compliant power supplies up to 300 W.
FAQ
What is the operating temperature range of the UCC3817DG4?
The UCC3817DG4 is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating makes it suitable for PC power supplies, consumer electronics, and indoor industrial equipment where thermal management is controlled. The related UCC2817DG4 variant extends this to −40°C to +85°C for harsher environments. Both share identical electrical specifications and pinout within their respective temperature ranges.
Does the UCC3817DG4 include an integrated gate driver?
Yes, the UCC3817DG4 integrates a totem-pole MOSFET gate driver on the DRVOUT pin (Pin 16), capable of delivering 0.2 A continuous and 1.2 A peak sink current. It drives the boost switch directly without external buffers, though a series gate resistor (≥11 Ω recommended at 18 V VCC) is required to damp ringing and limit peak current. This integration reduces external component count and layout complexity.
How does the UCC3817DG4 implement power factor correction?
The UCC3817DG4 achieves near-unity power factor using average current mode control: it senses instantaneous line current (via CAI/MOUT), compares it to a reference derived from rectified line voltage (IAC) and output voltage (VAOUT), then adjusts PWM duty cycle through CAOUT to force input current to track line voltage. The analog multiplier (IAC × VAOUT / VFF²) ensures constant power regulation across universal AC input ranges.
What is the purpose of the VFF pin on the UCC3817DG4?
The VFF (feed-forward voltage) pin on the UCC3817DG4 provides a scaled RMS representation of the AC input voltage, generated by mirroring half of the IAC current into an external RC filter. At low line (85 VAC), VFF ≈ 1.4 V; at high line (265 VAC), it rises to ≈ 4.7 V. This signal dynamically adjusts the multiplier gain to maintain consistent power limiting and THD performance across the full input range - a key enabler for universal-input operation.
Can the UCC3817DG4 be used in discontinuous conduction mode (DCM)?
No - the UCC3817DG4 is optimized for continuous conduction mode (CCM) boost PFC operation using average current mode control. While it can operate near the boundary, it lacks dedicated DCM or transition-mode (CRM) control features such as zero-current detection or variable-frequency modulation. For DCM/CRM applications, TI recommends the UCC28019 or UCC28070 families, which provide explicit valley-switching logic and adaptive frequency control.
UCC3817DG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
UCC3817DG4 FAQ
1.How can I place an order for UCC3817DG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3817DG4 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 UCC3817DG4 reliable?
The price and inventory of UCC3817DG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3817DG4 is usually 5 days.
3.What payment methods are accepted for UCC3817DG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3817DG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3817DG4?
UCC3817DG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3817DG4 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 UCC3817DG4?
For technical support, including UCC3817DG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3817DG4 requirements.
6.How does Aetrix verify that UCC3817DG4 is sourced from the original manufacturer or authorized distributors?
All UCC3817DG4 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 UCC3817DG4 meets industry standards.
7.What is the process for return or replacement of UCC3817DG4?
All UCC3817DG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3817DG4, 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 UCC3817DG4 part is unused and in its original packaging.
Return procedure for UCC3817DG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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