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Texas Instruments UCC2817DTR
- Part No.:
- UCC2817DTR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
UCC2817DTR.pdf
- Description:
- IC PFC CTR AVERAGE 220KHZ 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
UCC2817DTR 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 operates across worldwide AC line voltages (85–265 VAC), features 7.5-V reference output, 16-V/10-V UVLO thresholds, and drives external MOSFETs via integrated totem-pole gate driver DRVOUT - used in sub-300-W IEC61000-3-2-compliant PC and industrial power supplies.
For engineers reviewing the UCC2817DTR datasheet, UCC2817DTR pinout, UCC2817DTR application, or UCC2817DTR equivalent, key selection considerations include its −40°C to +85°C operating temperature range (vs. UCC3817's 0°C to +70°C), 150-μA start-up current, leading-edge PWM modulation, and accurate 7.5-V reference with ±2-mV current amplifier offset - critical for low-distortion PFC design at light loads.
Technical Context
The UCC2817DTR integrates an analog multiplier with three inputs (VAOUT, IAC, VFF) to generate a current-mode command signal (IMOUT) that shapes input current to match line voltage waveform. Its average current-mode architecture uses CAI/MOUT differential sensing and CAOUT feedback to maintain stable sinusoidal line current with improved noise immunity.
It employs leading-edge PWM modulation synchronized to zero-current detection, reducing bulk capacitor ripple current. The controller includes dedicated OVP/EN window comparator (1.9 V enable threshold), soft-start (SS) with 10-μA charge current, and zero-power detection (0.33 V threshold on VAOUT) to disable switching during no-load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −40°C to +85°C - enables use in industrial and extended-temperature environments where UCC3817 is not rated. |
| VREF Output | 7.5 V ±1.5% - precision reference for biasing and sensing; delivers up to 20 mA with short-circuit protection. |
| UVLO Thresholds | 16 V turn-on / 10 V turn-off - wide hysteresis prevents oscillation during brownout; distinct from UCC2818 (10.5 V/10 V). |
| Start-up Current | 150 μA typical - minimizes auxiliary supply burden during initial power-up. |
| Current Amp Offset | ±2 mV max - ensures low distortion at light load by maintaining accurate current sensing down to GND. |
| Oscillator Freq Range | 6 kHz to 220 kHz - set via RT/CT; supports flexible design of boost stage switching frequency and EMI optimization. |
| Gate Driver Output | DRVOUT with 5–12 Ω pullup / 2–10 Ω pulldown - drives MOSFET gates directly; requires external series resistor to limit overshoot. |
Pinout & Package
UCC2817DTR is housed in a 16-pin SOIC (D) package measuring 3.91 mm × 9.9 mm, optimized for surface-mount assembly and thermal performance (RθJA = 73.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Reference ground | All internal voltages referenced to this node; bypass VCC and VREF directly here with ≥0.1-μF ceramic capacitor. |
| PKLMT (2) | Peak current limit input | Threshold is 0 V; connects to negative side of current sense resistor via divider to set precise peak current trip point. |
| CAOUT (3) | Current amplifier output | Wide-bandwidth op-amp output driving PWM latch; compensation network placed between CAOUT and MOUT. |
| CAI (4) | Current amp noninverting input | Connects to GND-side of current sense resistor; functional down to and below GND for bidirectional sensing. |
| MOUT (5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and current amp feedback; enables differential configuration for noise immunity. |
| IAC (6) | Line voltage proportional current input | Accepts ≤500 μA current proportional to rectified AC line; primary feedforward path for distortion reduction. |
| VAOUT (7) | Voltage error amplifier output | Regulates boost output voltage; internally clamped to ~5.5 V to prevent overshoot; feeds zero-power comparator. |
| VFF (8) | Feed-forward RMS voltage | Generated by mirroring ½ IAC through external RC filter; 1.4 V at low line, scales with VAC2 for line-voltage feedforward. |
| VREF (9) | 7.5-V reference output | Stable, current-limited reference for external circuitry; disabled when VCC < UVLO; requires local 0.1-μF bypass. |
| OVP/EN (10) | Overvoltage/enable input | Window comparator: disables driver above programmed OVP level or forces shutdown if pulled <1.9 V (typ). |
| VSENSE (11) | Voltage amp inverting input | Connected to output voltage divider and compensation network; sets regulated output voltage (e.g., 385 V DC). |
| RT (12) | Oscillator timing resistor | Resistor from RT to GND programs oscillator charging current; nominal voltage = 3 V; 10–100 kΩ recommended. |
| SS (13) | Soft-start control | Charges external capacitor with 10-μA current source; ramps duty cycle gradually; discharges fast on VCC dropout. |
| CT (14) | Oscillator timing capacitor | Capacitor from CT to GND sets frequency per f ≈ 0.6/(RT × CT); requires shortest possible GND trace. |
| VCC (15) | Supply input | 10–17 V operation; must exceed 16 V to enable; bypassed directly to GND to absorb MOSFET gate charge spikes. |
| DRVOUT (16) | Gate drive output | Totem-pole MOSFET driver for boost switch; requires external series gate resistor (e.g., 11 Ω @ 18 V, 1.2 A sink). |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal line current without requiring current-sense transformer or complex filtering. |
| Leading-edge PWM modulation | Synchronizes switching to zero-current crossing, reducing RMS ripple current in bulk capacitor and extending electrolytic lifetime. |
| Accurate 7.5-V reference | ±1.5% tolerance over temperature; supports precise biasing of external circuits and improves system-level voltage regulation accuracy. |
| Low-offset current amplifier | ±2-mV input offset ensures minimal current-sense error at light loads, preserving power factor and THD performance. |
| Worldwide line operation | Supports universal 85–265 VAC input with feed-forward (VFF) and UVLO hysteresis, eliminating manual voltage-range selection. |
| Integrated OVP and enable logic | Dual-function OVP/EN pin provides programmable overvoltage shutdown and external enable capability in single pin. |
Applications
| PC Power Supply | Industrial AC-DC Converter |
|---|---|
Use Scenario: 250-W ATX main power supply complying with IEC61000-3-2 Class D limits. IC Role / Device Role / Timing Role: UCC2817DTR controls boost PFC stage to shape input current, regulate 385-V DC bus, and provide clean, low-THD input draw. Use Value: Enables Class D compliance without external harmonic filters; −40°C to +85°C rating supports fanless industrial chassis designs. |
Use Scenario: DIN-rail mounted 240-W AC-DC converter for factory automation equipment. IC Role / Device Role / Timing Role: UCC2817DTR serves as primary PFC controller in CCM boost topology, interfacing with downstream isolated DC-DC stage. Use Value: Leading-edge modulation reduces bulk capacitor stress; 150-μA start-up current lowers auxiliary supply requirements in standby mode. |
| LED Driver Front-End | Consumer Audio Power Supply |
Use Scenario: 150-W constant-current LED driver for commercial lighting with universal input. IC Role / Device Role / Timing Role: UCC2817DTR regulates high-voltage DC bus feeding downstream buck-boost LED current controller. Use Value: Accurate 7.5-V reference stabilizes feedback loop; VFF feed-forward maintains regulation across 85–265 VAC without adjustment. |
Use Scenario: High-fidelity AV receiver power supply requiring low-noise, low-distortion AC input. IC Role / Device Role / Timing Role: UCC2817DTR implements active PFC before dual-rail linear regulators to minimize mains interference. Use Value: Average current-mode control achieves <5% THD at full load; CAI/MOUT differential sensing rejects common-mode noise from audio circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2818DTR | Lower UVLO (10.5 V/10 V), same pinout and function; rated for −40°C to +85°C but optimized for lower-voltage input systems. | Preferred for 90–132 VAC-only or universal-input designs where tighter UVLO hysteresis is needed. | Select UCC2818DTR when input undervoltage protection must trigger closer to nominal VCC to avoid nuisance shutdowns. |
| UCC3817DTR | Same functionality and pinout, but rated only for 0°C to +70°C; higher start-up current (200 μA); identical electrical specs otherwise. | Suitable for cost-sensitive consumer applications with controlled ambient temperature. | Choose UCC3817DTR only if operating temperature stays within 0–70°C and qualification for extended temp is not required. |
Compared with UCC2818DTR and UCC3817DTR, the UCC2817DTR uniquely combines 16-V/10-V UVLO hysteresis, −40°C to +85°C rating, and 150-μA start-up current - making it the optimal choice for robust, globally compliant PFC stages where reliability across voltage sags and wide ambient ranges is mandatory.
Availability
UCC2817DTR is available at Aetrix Electronics and suitable for PC power supplies, industrial AC-DC converters, and LED driver front-ends requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for UCC2817DTR 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 ICs, with decades of expertise in power conversion and energy efficiency solutions.
The UCC2817DTR belongs to TI's BiCMOS PFC controller product line, designed specifically for high-efficiency, low-distortion active power factor correction in sub-300-W AC-DC power supplies meeting international harmonic standards.
FAQ
What is the operating temperature range of the UCC2817DTR?
The UCC2817DTR is specified for operation from −40°C to +85°C, making it suitable for industrial and extended-temperature applications where the UCC3817DTR (0°C to +70°C) would not qualify. This rating is confirmed in the device's Recommended Operating Conditions table and distinguishes it within the UCCx817 family.
Does the UCC2817DTR support leading-edge or trailing-edge PWM modulation?
The UCC2817DTR implements leading-edge PWM modulation, which synchronizes the switch turn-on with zero-current detection to reduce RMS ripple current in the output bulk capacitor. This feature is explicitly documented in the Features and Detailed Description sections of the datasheet and contributes to longer capacitor lifetime in high-reliability designs.
What is the purpose of the VFF pin on the UCC2817DTR?
The VFF pin on the UCC2817DTR provides a feed-forward voltage derived from the squared line voltage (via IAC mirroring), enabling line-voltage proportional gain adjustment in the analog multiplier. At low line, VFF should be 1.4 V; it scales with VAC2 to maintain constant power regulation and improve line transient response without additional compensation.
Can the UCC2817DTR be used as a direct replacement for the UCC3817DTR?
The UCC2817DTR is pin-compatible and functionally identical to the UCC3817DTR, but adds extended temperature range (−40°C to +85°C) and lower start-up current (150 μA vs. 200 μA). No PCB changes are required; however, system-level validation at low temperature is recommended due to differing qualification scope.
What is the maximum gate drive current capability of the UCC2817DTR's DRVOUT pin?
The UCC2817DTR's DRVOUT pin delivers up to 1.2 A peak sink current and approximately 900 mA peak source current, with pulldown resistance of 2–10 Ω and pullup resistance of 5–12 Ω. An external series gate resistor is mandatory to damp ringing - e.g., 11 Ω for 18-V VCC and 1.2-A sink, per Figure 6 in the datasheet.
UCC2817DTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
UCC2817DTR FAQ
1.How can I place an order for UCC2817DTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC2817DTR 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 UCC2817DTR reliable?
The price and inventory of UCC2817DTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC2817DTR is usually 5 days.
3.What payment methods are accepted for UCC2817DTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC2817DTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC2817DTR?
UCC2817DTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC2817DTR 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 UCC2817DTR?
For technical support, including UCC2817DTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC2817DTR requirements.
6.How does Aetrix verify that UCC2817DTR is sourced from the original manufacturer or authorized distributors?
All UCC2817DTR 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 UCC2817DTR meets industry standards.
7.What is the process for return or replacement of UCC2817DTR?
All UCC2817DTR units undergo pre-shipment inspection (PSI). If there is an issue with UCC2817DTR, 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 UCC2817DTR part is unused and in its original packaging.
Return procedure for UCC2817DTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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