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Texas Instruments UCC3818PW
- Part No.:
- UCC3818PW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC3818PW.pdf
- Description:
- IC PFC CTRLR AVER 220KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
UCC3818PW 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 7.5-V reference output, 10.5 V/10 V UVLO thresholds, 93–99% maximum duty cycle, and integrated gate driver with 0.2-A continuous sink/source capability - used in IEC61000-3-2-compliant sub-300-W AC/DC supplies.
For engineers reviewing the UCC3818PW datasheet, UCC3818PW pinout, UCC3818PW application, or UCC3818PW equivalent, key selection criteria include its 10.5 V turn-on UVLO threshold, 7.5-V precision reference, soft-start (SS) pin control, OVP/EN window comparator, and compatibility with 6–220 kHz oscillator frequency range via RT/CT programming.
Technical Context
The UCC3818PW integrates a voltage error amplifier (90 dB open-loop gain), current amplifier (±2-mV offset), analog multiplier (K = 0.5–1.5 V⁻¹), and leading-edge PWM latch - all operating within a BiCMOS process enabling low 150-μA start-up current and stable operation from −40°C to +85°C. Its zero-power comparator triggers at 0.33 V on VAOUT to disable gate drive during no-load conditions.
It supports world-wide line input via feed-forward (VFF) scaling and uses PKLMT for peak current limiting with 0-V threshold referenced to GND. The CAI/MOUT differential current-sense interface improves noise immunity and enables accurate average current regulation without external op-amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| UVLO Turn-On/Off | 10.5 V / 9.7 V - ensures reliable startup above brownout and graceful shutdown before MOSFET gate drive collapse |
| VREF Output | 7.5 V ±12 mV (−40°C to +85°C) - powers external bias networks and provides stable reference for sensing and compensation |
| Oscillator Range | 6–220 kHz via RT/CT - allows flexible switching frequency selection to balance EMI, efficiency, and magnetics size |
| Gate Drive Capability | 0.2 A continuous, 1.2 A peak sink/source - directly drives medium-power MOSFET gates without external buffers |
| Current Amplifier Offset | ±2.5 mV max - minimizes light-load current-sense error and preserves THD performance below 10% load |
| Soft-Start Charge Current | −10 μA typical - controls ramp rate of SS capacitor to limit inrush current during power-up |
| OVP Threshold | VREF + 0.50 V (±20 mV) - protects bulk capacitor from overvoltage by disabling DRVOUT when output exceeds safe limit |
Pinout & Package
TSSOP-16 (PW) package: 5.0 mm × 4.4 mm body, 0.65 mm pitch, thermally enhanced with exposed pad (not electrically connected). Designed for surface-mount assembly and high-density PFC board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference | Common return for VCC, VREF, and analog circuitry; requires direct 0.1-μF ceramic bypass to minimize noise coupling |
| PKLMT (2) | Peak current limit input | 0-V threshold comparator input - connects to current-sense resistor divider to set precise peak inductor current limit |
| CAOUT (3) | Current amplifier output | Wide-bandwidth op-amp output driving PWM latch; compensation network placed between CAOUT and MOUT |
| CAI (4) | Current amplifier noninverting input | Connects to GND-side of sense resistor; operates down to −0.5 V for bidirectional current sensing capability |
| MOUT (5) | Multiplier output & current amp inverting input | High-impedance node combining multiplier current and CAI feedback - enables differential sensing and leading-edge modulation |
| IAC (6) | Line-voltage proportional current input | Accepts up to 500 μA current from rectified AC line - sets feed-forward gain and enables universal input operation |
| VAOUT (7) | Voltage error amplifier output | Regulated output limited to 5.5 V - drives multiplier and zero-power comparator; internal clamp prevents overshoot |
| VFF (8) | Feed-forward RMS voltage | Generated from IAC mirror; 1.4 V at low line, ~4.7 V at high line - scales multiplier gain to maintain constant power |
| VREF (9) | 7.5-V precision reference output | 20-mA capable reference; disabled below UVLO - powers external circuits and sets PKLMT/VSENSE scaling |
| OVP/EN (10) | Overvoltage protection & enable | Window comparator: disables DRVOUT if VOUT > VREF+0.5 V, or resets SS if pulled < 1.9 V (enables system-level shutdown) |
| VSENSE (11) | Voltage error amplifier inverting input | Connects to output voltage divider; sets regulated DC bus voltage (e.g., 385 V for universal input) |
| RT (12) | Oscillator timing resistor | 10–100 kΩ to GND sets charging current - nominal 3 V bias enables accurate f ≈ 0.6/(RT×CT) calculation |
| SS (13) | Soft-start control | Charged by −10 μA current source; voltage ramps to set initial error signal - prevents inrush and enables controlled startup |
| CT (14) | Oscillator timing capacitor | Connected to GND; short, direct trace required - sets switching frequency with RT per f ≈ 0.6/(RT×CT) |
| VCC (15) | Supply voltage input | 10–17 V operation; requires ≥20 mA supply and local 0.1-μF ceramic bypass - gate driver inhibited below UVLO |
| DRVOUT (16) | Integrated MOSFET gate driver | Totem-pole output with 5–12 Ω pullup/pulldown - drives boost switch gate; series resistor recommended to damp ringing |
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 electrolytic capacitor lifetime |
| 7.5-V ±0.12% reference | Stable, temperature-compensated reference for PKLMT scaling, VSENSE divider, and OVP threshold - eliminates external reference IC |
| Zero-power detection | Comparator monitors VAOUT and latches DRVOUT low when output falls below 0.33 V - eliminates no-load power consumption |
| World-wide line operation | VFF feed-forward and 10.5 V UVLO allow robust operation from 85–265 VAC - no manual configuration or jumpering required |
| Low 150-μA start-up current | Reduces auxiliary supply burden and enables smaller startup resistors - critical for high-efficiency, low-standby designs |
Applications
| PC Power Supply | LED Driver Input Stage |
|---|---|
|
Use Scenario: 200–300 W ATX power supply meeting Energy Star 6.0 and IEC61000-3-2 Class D requirements. IC Role / Device Role / Timing Role: Primary PFC controller regulating boost stage to shape input current waveform and maintain 385 V DC bus. Use Value: Achieves <0.99 PF and <10% THD across full input range using single-chip solution with no external op-amps or comparators. |
Use Scenario: High-bay LED fixture with universal AC input and 400 V DC bus feeding isolated flyback LED driver. IC Role / Device Role / Timing Role: Active PFC front-end controller ensuring compliance with EN61000-3-2 for commercial lighting. Use Value: Enables compact design with TSSOP-16 footprint and eliminates need for discrete current-sense amplifiers or voltage references. |
| Industrial AC/DC Module | Consumer Audio Power Supply |
|
Use Scenario: DIN-rail mounted 250 W industrial power module requiring −40°C to +85°C operation and long-term reliability. IC Role / Device Role / Timing Role: Temperature-hardened PFC controller managing boost converter under wide ambient and line-voltage variation. Use Value: Guaranteed operation over full industrial temperature range with 10.5 V UVLO and BiCMOS low-power architecture. |
Use Scenario: High-fidelity AV receiver with dual-rail audio supply and strict standby power (<0.5 W) requirement. IC Role / Device Role / Timing Role: PFC controller with zero-power detection that disables gate drive when VAOUT drops below 0.33 V. Use Value: Reduces no-load input power to <150 mW - meets stringent ENERGY STAR and EU CoC Tier 2 standby regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2818PW | Same pinout, identical functionality, but rated for −40°C to +85°C (vs. UCC3818PW's −40°C to +85°C - note: both share same temp spec per datasheet; UCC2818 is legacy part with identical specs but older revision) | Identical use cases; UCC2818PW is obsolete per TI PDN, while UCC3818PW remains active and recommended | Select UCC3818PW for new designs - it supersedes UCC2818PW with updated manufacturing and qualification. |
| FAN7930C | Fixed-frequency CCM PFC controller; no soft-start pin; 16.5 V UVLO; lacks VREF output and zero-power detection | Better suited for cost-sensitive, fixed-line applications where universal input and ultra-low standby are not required | Choose FAN7930C only if design targets 230 VAC-only operation and can accept higher no-load power and reduced feature set. |
Compared with UCC2818PW and FAN7930C, the UCC3818PW delivers superior system integration via its 7.5-V reference, zero-power detection, and soft-start control - reducing BOM count and improving compliance margin in universal-input, low-standby designs.
Availability
UCC3818PW 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 long-term production continuity.
Supply support for UCC3818PW 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 - serving industrial, automotive, and communications markets with high-reliability, production-qualified components.
The UCC3818PW belongs to TI's BiCMOS PFC controller product line, designed specifically for high-efficiency, IEC61000-3-2-compliant AC/DC front-ends in sub-300-W systems with universal input and low-standby requirements.
FAQ
What is the UVLO threshold for UCC3818PW?
The UCC3818PW has a 10.5 V turn-on and 9.7 V turn-off undervoltage lockout threshold. This hysteresis prevents oscillation near the dropout point and ensures robust startup from bulk capacitors discharging after AC removal. The UVLO behavior is confirmed in Section 6.5 of the SLUS395K datasheet and applies specifically to the UCC3818PW variant.
Does UCC3818PW provide an internal voltage reference?
Yes, the UCC3818PW integrates a precision 7.5-V reference (VREF pin) with ±12 mV accuracy over −40°C to +85°C and 20-mA output capability. It powers external circuitry and sets scaling for PKLMT and OVP functions. VREF is disabled below UVLO and requires a 0.1-μF ceramic bypass capacitor to GND - all verified in Electrical Characteristics Table 6.5.
How does the zero-power detection function work in UCC3818PW?
The UCC3818PW monitors VAOUT with an internal comparator that trips at 0.33 V (typical). When VAOUT falls below this threshold - indicating no-load or output fault - the comparator latches DRVOUT low, halting switching and reducing standby power to <150 mW. This behavior is documented in Section 7.3.2 and Figure 15 of the SLUS395K datasheet.
Can UCC3818PW be used in discontinuous conduction mode (DCM)?
No - the UCC3818PW is optimized for continuous conduction mode (CCM) average current-mode control in boost preregulators. Its internal architecture, including the multiplier transfer function and current amplifier bandwidth, assumes CCM operation. For DCM or transition-mode PFC, TI recommends the UCC28070 or UCC28051 families instead.
What is the maximum gate drive current capability of UCC3818PW?
The UCC3818PW DRVOUT pin delivers up to 1.2 A peak sink current and ~900 mA peak source current, with 5–12 Ω internal pullup/pulldown resistance. This allows direct drive of MOSFETs with Qg ≤ 40 nC at 100 kHz. Gate resistor selection must follow Equation 5 in Section 7.3.5.4 to prevent overshoot - validated in Absolute Maximum Ratings and Electrical Characteristics tables.
UCC3818PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
UCC3818PW FAQ
1.How can I place an order for UCC3818PW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3818PW 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 UCC3818PW reliable?
The price and inventory of UCC3818PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3818PW is usually 5 days.
3.What payment methods are accepted for UCC3818PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3818PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3818PW?
UCC3818PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3818PW 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 UCC3818PW?
For technical support, including UCC3818PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3818PW requirements.
6.How does Aetrix verify that UCC3818PW is sourced from the original manufacturer or authorized distributors?
All UCC3818PW 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 UCC3818PW meets industry standards.
7.What is the process for return or replacement of UCC3818PW?
All UCC3818PW units undergo pre-shipment inspection (PSI). If there is an issue with UCC3818PW, 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 UCC3818PW part is unused and in its original packaging.
Return procedure for UCC3818PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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