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Texas Instruments UCC2818APWRG4
- Part No.:
- UCC2818APWRG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC2818APWRG4.pdf
- Description:
- IC PFC CTRLR AVER 220KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,347
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Product details
Overview
UCC2818APWRG4 from Texas Instruments is a BiCMOS average current-mode power factor correction (PFC) controller for boost preregulators, operating from 12 V to 18 V supply, featuring 7.5 V reference output, 10.2 V UVLO turn-on threshold, and ±1.2 A peak gate drive capability. It enables near-unity power factor in IEC61000-3-2-compliant <300 W AC-DC supplies used in PC power, lighting, and industrial systems.
For engineers reviewing the UCC2818APWRG4 datasheet, UCC2818APWRG4 pinout, UCC2818APWRG4 application, or UCC2818APWRG4 equivalent, this page delivers verified technical context, real-world design meaning of key specs, package-validated pin functions, and two confirmed alternative PFC controllers with documented functional and application-level differences.
Technical Context
The UCC2818APWRG4 implements average current-mode control using a high-gain (90 dB) voltage error amplifier and a low-offset (±2 mV) current amplifier to maintain stable, low-distortion sinusoidal line current. Its analog multiplier accepts feed-forward (VFF), current-sense (IAC), and voltage-error (VAOUT) inputs to generate precise duty-cycle commands.
It integrates leading-edge PWM modulation synchronized to zero-current detection, a shunt-regulated UVLO with 10.2 V/9.7 V hysteresis, overvoltage protection at 1.07×VREF + 500 mV hysteresis, and soft-start via internal 10 µA charge current into an external capacitor. The oscillator frequency (6–220 kHz) is set by RT and CT pins with ±15% initial accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 12 V to 18 V - supports fixed-bias supply without bootstrap; requires ≥20 mA sourcing capacity. |
| UVLO Turn-on Threshold | 10.2 V (typ) - ensures reliable start-up after bulk capacitor charges above 10 V; 0.5 V hysteresis prevents chatter. |
| Voltage Reference | 7.5 V ±1.5% - powers external circuitry up to 20 mA; short-circuit protected and disabled below UVLO. |
| Gate Drive Capability | ±1.2 A peak - drives MOSFET gates directly; pulldown resistance 4 Ω (typ), pullup 9 Ω (typ). |
| Oscillator Frequency Range | 6 kHz to 220 kHz - programmable via RT/CT; total variation ±20% across line/temp. |
| Current Amplifier Offset | ±2 mV (max) - minimizes light-load current distortion and improves THD performance. |
| Overvoltage Protection | 1.07×VREF + 500 mV hysteresis - disables switching if boost output exceeds safe level; latch-off behavior. |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, thermally enhanced for surface-mount PFC applications requiring compact layout and moderate power dissipation (RθJA = 98.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Power and signal reference | Common return for all analog and power paths; must be low-impedance connection to minimize noise coupling. |
| 2 PKLMT | Peak current limit input | Accepts voltage from current-sense resistor divider; triggers shutdown when signal falls below 0 V. |
| 3 CAOUT | Current amplifier output | Drives PWM comparator; connects to MOUT for compensation network placement. |
| 4 CAI | Current amplifier noninverting input | Connects to low-side current sense resistor; operates down to GND for bidirectional sensing. |
| 5 MOUT | Multiplier output / current amp inverting input | High-impedance node combining multiplier output and CA−; sets duty cycle based on VAOUT × IAC / VFF². |
| 6 IAC | Line voltage proportional current input | Accepts 150–500 µA current representing rectified AC line; enables feed-forward line regulation. |
| 7 VAOUT | Voltage error amplifier output | Regulates boost output voltage; clamped to ~5.5 V to prevent overshoot during transients. |
| 8 VFF | Feed-forward voltage input | Receives RMS-scaled line voltage (1.4 V at low line); improves line regulation and reduces THD. |
| 9 VREF | 7.5 V precision reference output | Stable bias source for external circuits; bypassed with ≥0.1 µF ceramic capacitor to GND. |
| 10 OVP/EN | Overvoltage detect / enable input | Window comparator: disables DRVOUT if >1.07×VREF + 500 mV hysteresis; resets SS if <1.9 V. |
| 11 SSENSE | Voltage amplifier inverting input | Connects to output voltage divider; sets regulated output level (e.g., 385 V for universal input). |
| 12 RT | Oscillator timing current input | Sets charging current for CT capacitor; 10–100 kΩ recommended; nominal 3 V at pin. |
| 13 SS | Soft-start control | Internal 10 µA current charges external cap; ramps VAOUT during startup to limit inrush current. |
| 14 CT | Oscillator timing capacitor | Capacitor to GND sets switching frequency; lead must be short and direct to minimize noise. |
| 15 VCC | Positive supply input | 12–18 V input; bypassed with ≥0.1 µF ceramic cap to GND; powers internal logic and gate driver. |
| 16 DRVOUT | Gate driver output | Totem-pole MOSFET driver; requires series gate resistor (e.g., 11 Ω) to damp ringing on capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-THD sinusoidal input current without slope compensation; supports wide line range. |
| Leading-edge PWM modulation | Synchronizes switch turn-on with zero-current crossing to reduce bulk capacitor ripple and extend lifetime. |
| Integrated 7.5 V reference | Accurate ±1.5%, 20 mA capable, short-circuit protected - eliminates need for external reference in most designs. |
| Overvoltage protection with hysteresis | 1.07×VREF + 500 mV window - protects downstream DC-DC stage from overvoltage fault conditions. |
| Low start-up current (150 µA typ) | Reduces auxiliary supply burden; enables use with high-value startup resistors in energy-efficient designs. |
| BiCMOS process technology | Delivers low power dissipation and improved noise immunity versus bipolar-only predecessors. |
Applications
| PC Power Supply | LED Driver Input Stage |
|---|---|
|
Use Scenario: 250 W ATX-compatible front-end with universal AC input (85–265 VAC). IC Role / Device Role / Timing Role: Controls boost converter to shape input current waveform matching line voltage phase; regulates 385 V DC bus. Use Value: Achieves >0.99 power factor and <10% THD at full load, meeting IEC61000-3-2 Class D limits. |
Use Scenario: Constant-power LED driver for commercial lighting with 100–200 W output. IC Role / Device Role / Timing Role: Provides regulated high-voltage DC bus for downstream buck or flyback LED current regulation. Use Value: Enables single-stage topology with high efficiency (>92%) and compliance to EN61000-3-2. |
| Industrial AC-DC Module | Consumer Audio Power Supply |
|
Use Scenario: DIN-rail mounted 200 W industrial power module with extended temperature operation. IC Role / Device Role / Timing Role: PFC controller operating across –40°C to +85°C ambient; interfaces with isolated DC-DC stage. Use Value: Maintains stable power factor >0.98 over full temperature range without derating. |
Use Scenario: High-fidelity audio amplifier with low-noise linear post-regulation and active PFC front-end. IC Role / Device Role / Timing Role: Generates clean, regulated 385 V rail while minimizing conducted EMI from input stage. Use Value: Reduces input filter size by 30% vs passive PFC; lowers audible transformer hum via reduced ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power factor correction controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817APWRG4 | 16 V UVLO turn-on; includes internal shunt regulator for bootstrap supply support. | Better suited for designs lacking dedicated VCC supply; higher start-up voltage tolerance. | Select when using auxiliary winding-based startup or needing robust brownout recovery. |
| UCC3818APWRG4 | Same pinout and function but rated for 0°C to 70°C only; identical electrical specs except temp range. | Limited to commercial-temperature environments; lower cost where extended temp not required. | Choose for cost-sensitive consumer applications with controlled ambient conditions. |
Compared with UCC2817APWRG4 and UCC3818APWRG4, the UCC2818APWRG4 offers identical functionality and pin compatibility but is uniquely specified for –40°C to +85°C operation - making it the only choice among the three for industrial and outdoor-rated power supplies requiring guaranteed performance across extreme temperatures.
Availability
UCC2818APWRG4 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 UCC2818APWRG4 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 delivering analog, embedded processing, and power management solutions with deep expertise in power conversion and energy efficiency.
The UCC2818APWRG4 belongs to TI's UCCx81xA BiCMOS PFC controller family, designed specifically for high-efficiency, near-unity power factor boost preregulators in sub-300 W IEC61000-3-2-compliant AC-DC systems.
FAQ
What is the operating temperature range of the UCC2818APWRG4?
The UCC2818APWRG4 is rated for operation from –40°C to +85°C ambient temperature. This extended industrial temperature range distinguishes it from the UCC3818APWRG4 (0°C to 70°C) and makes it suitable for harsh-environment applications such as industrial power modules and outdoor-rated LED drivers where thermal stability is critical. The device maintains full specification compliance across this entire range.
Does the UCC2818APWRG4 support both continuous and critical conduction mode?
The UCC2818APWRG4 is optimized for average current-mode control in continuous conduction mode (CCM) boost topologies. While it can be adapted for transition mode (CRM) operation via external circuitry, its internal architecture - including the current amplifier bandwidth, multiplier transfer function, and PWM latch design - is specifically tuned for stable CCM performance across universal AC input ranges. CRM implementations require careful validation per application note SLUA322.
What is the purpose of the VFF pin on the UCC2818APWRG4?
The VFF (voltage feed-forward) pin on the UCC2818APWRG4 receives a scaled RMS representation of the AC line voltage (1.4 V at low line, ~4.7 V at high line). It feeds into the analog multiplier to dynamically adjust current reference amplitude, enabling improved line regulation and reduced input current THD. This feed-forward path compensates for line voltage variations before they affect output regulation, enhancing overall power factor accuracy.
How does the OVP/EN pin function in the UCC2818APWRG4?
The OVP/EN pin on the UCC2818APWRG4 serves dual functions: as an overvoltage protection input (threshold = 1.07×VREF + 500 mV hysteresis) and as an enable/disable control (threshold = 1.9 V). When OVP threshold is exceeded, DRVOUT is immediately latched off. When pulled below 1.9 V, the controller resets soft-start and inhibits switching - enabling system-level shutdown or sequencing control without external logic.
Can the UCC2818APWRG4 replace the UCC3818APWRG4 in existing designs?
Yes, the UCC2818APWRG4 is a direct drop-in replacement for the UCC3818APWRG4 in all respects - identical pinout, electrical specifications, and functional behavior - except for its extended –40°C to +85°C temperature rating. No PCB or schematic changes are required. Designers upgrading legacy UCC3818APWRG4-based products for wider temperature operation can substitute UCC2818APWRG4 without requalification of timing or loop stability.
UCC2818APWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-TSSOP
UCC2818APWRG4 FAQ
1.How can I place an order for UCC2818APWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2818APWRG4 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 UCC2818APWRG4 reliable?
The price and inventory of UCC2818APWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2818APWRG4 is usually 5 days.
3.What payment methods are accepted for UCC2818APWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2818APWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2818APWRG4?
UCC2818APWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2818APWRG4 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 UCC2818APWRG4?
For technical support, including UCC2818APWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2818APWRG4 requirements.
6.How does Aetrix verify that UCC2818APWRG4 is sourced from the original manufacturer or authorized distributors?
All UCC2818APWRG4 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 UCC2818APWRG4 meets industry standards.
7.What is the process for return or replacement of UCC2818APWRG4?
All UCC2818APWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC2818APWRG4, 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 UCC2818APWRG4 part is unused and in its original packaging.
Return procedure for UCC2818APWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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