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Texas Instruments UCC28516DWR
- Part No.:
- UCC28516DWR
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UCC28516DWR.pdf
- Description:
- IC PFC CTR AVERAGE 200KHZ 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,050
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Product details
Overview
UCC28516DWR from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM control in a single SOIC-20 package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:2 PFC:PWM frequency ratio (PFC at ~100 kHz, PWM at ~200 kHz), and features input voltage feedforward, programmable soft-start, and zero power detect. It targets IEC 61000-3-2-compliant AC/DC front-ends in industrial power supplies and server PSUs.
For engineers reviewing the UCC28516DWR datasheet, UCC28516DWR pinout, UCC28516DWR application, or UCC28516DWR equivalent, key selection criteria include its 1:2 frequency ratio configuration, dual UVLO thresholds (16 V turn-on / 3.55 V PWM turn-off), 7.5-V precision reference, and verified compatibility with boost PFC + flyback/buck-derived PWM topologies.
Technical Context
The UCC28516DWR implements leading-edge modulation for the PFC stage and trailing-edge modulation for the PWM stage to minimize ripple current in the boost output capacitor. Its PFC section uses a three-input linearized multiplier with input voltage feedforward and a transconductance voltage amplifier for fast load transient response.
The PWM stage provides peak-current-mode control with slope compensation via CT_BUFF, programmable maximum duty cycle (70–80% clamped), and independent UVLO2 (6.3–7.3 V turn-on, 3.55 V turn-off). Startup sequencing ensures PWM activation only after PFC output reaches 90% of regulation, and shutdown suppresses PWM when PFC output drops to 47% of nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PFC operates at half the PWM frequency (e.g., ~100 kHz PFC / ~200 kHz PWM), reducing boost capacitor ripple and enabling higher-power density designs. |
| Gate Drive Capability | 2-A source / 3-A sink per output (GT1, GT2) - directly drives medium-power MOSFETs without external buffers in typical 300–500 W applications. |
| VREF Output | 7.5 V ±15 mV - precision internal reference powering external resistive dividers and bias networks with <5 mV load regulation up to 6 mA. |
| UVLO Thresholds | VCC turn-on: 16 V ±0.6 V; PWM UVLO2 turn-off: 3.55 V ±0.65 V - enables robust brown-in/brown-out behavior with 2.56 V hysteresis for hold-up time compliance. |
| Maximum Duty Cycle Clamp | 70–80% (programmable via D_MAX pin) - prevents transformer saturation in flyback and forward converters under overload or startup conditions. |
| Zero Power Detect Threshold | 0.33 V (falling edge on VAOUT) - disables PFC gate drive below standby power levels, supporting low-noise, low-loss idle operation. |
Pinout & Package
UCC28516DWR is housed in a 20-pin SOIC (DW) package with 0.65 mm pitch, rated for −40°C to +105°C operation and optimized for surface-mount assembly in high-reliability power systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC gate driver output | 2-A source / 3-A sink totem pole driving boost MOSFET; disabled during UVLO or VREF fault. |
| GT2 (10) | PWM gate driver output | Identical drive strength to GT1; enabled only after PFC output reaches 90% of regulation. |
| VSENSE (3) | PFC voltage error amplifier inverting input | Feedback node for PFC output voltage regulation; also feeds OVP, ENABLE, and PWM UVLO2 comparators. |
| VERR (7) | PWM error amplifier input | Accepts optocoupler feedback signal; clamped to 3 V max and sources ~10 µA pull-up current. |
| IAC (18) | PFC multiplier line-voltage current input | Receives scaled rectified line current (≤500 µA); enables input voltage feedforward for near-unity PF across universal AC input. |
| VFF (19) | PFC voltage feedforward output | Sources IAC/2 current; external RC filter generates feedforward voltage (1.4 V at low line, 4.7 V at high line). |
| CAOUT (15) | PFC current amplifier output | Drives PFC PWM comparator; connects externally to MOUT for current loop compensation. |
| SS2 (13) | PWM soft-start timing input | Capacitor-to-ground sets PWM ramp duration; internal 10.5 µA charge current yields tSS = 286 ms per µF. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + PWM control | Single-chip solution eliminates inter-stage timing mismatches and reduces BOM count by consolidating two controllers and gate drivers. |
| Leading-edge PFC / trailing-edge PWM modulation | Reduces RMS ripple current in boost output capacitor by >30% vs. TEM/TEM schemes, lowering capacitor stress and size. |
| Programmable PWM maximum duty cycle | D_MAX pin accepts 0.09–0.90 V to linearly set 70–80% clamp - critical for preventing transformer saturation in flyback designs. |
| Transconductance voltage amplifier (VAOUT) | 70–130 µS gm, 50–60 dB open-loop gain, slew-enhanced output - delivers fast recovery (<10 µs) from large load transients in PFC stage. |
| Zero power detect with hysteresis | Turns off GT1 when VAOUT falls below 0.33 V (±0.14 V hysteresis), eliminating no-load switching losses and improving standby efficiency. |
Applications
| Industrial AC/DC Power Supplies | Server & Telecom PSUs |
|---|---|
Use Scenario: 300–600 W universal-input (85–265 VAC) power supply with active PFC front-end and isolated DC/DC stage. IC Role / Device Role / Timing Role: UCC28516DWR controls boost PFC (leading-edge, ~100 kHz) and flyback PWM (trailing-edge, ~200 kHz) with synchronized startup and sequenced enable. Use Value: Meets IEC 61000-3-2 Class C harmonic limits while achieving >94% system efficiency and <0.5 W no-load consumption. | Use Scenario: Redundant 80 PLUS Titanium-certified PSU requiring tight hold-up time and dynamic load regulation. IC Role / Device Role / Timing Role: UCC28516DWR manages PFC output voltage regulation and PWM duty cycle with dual UVLO (16 V / 3.55 V) for precise brown-out recovery. Use Value: Enables 20 ms hold-up time at full load using standard 470 µF/450 V bulk capacitors due to accurate 47% PFC dropout threshold. |
| Medical Equipment Power Modules | Test & Measurement Instrumentation |
Use Scenario: Low-noise, low-EMI AC/DC module for diagnostic imaging equipment with strict EMI Class B compliance. IC Role / Device Role / Timing Role: UCC28516DWR implements feedforward-controlled PFC and slope-compensated PWM to suppress common-mode noise at 100/200 kHz switching nodes. Use Value: Reduces conducted EMI peaks by 8–10 dB compared to discrete PFC+PWM solutions, easing filter design and certification. | Use Scenario: Programmable bench power supply with analog voltage/current programming and fast transient response. IC Role / Device Role / Timing Role: UCC28516DWR regulates PFC bus voltage and controls synchronous rectified buck converter via GT2-driven high-side switch. Use Value: Achieves <100 µs load transient recovery (20–80% step) using VAOUT's 3.3 mA slew boost and transconductance amplifier architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28516N | Same functional spec, but in 20-pin PDIP package with higher thermal resistance (1 W vs. 0.7 W SOIC rating) and no tape-and-reel option. | Preferred for prototyping or through-hole assembly; unsuitable for automated SMT production or high-density layouts. | Select UCC28516N only for hand-soldered evaluation; UCC28516DWR is required for volume SMT manufacturing. |
| UCC28517DWR | Identical SOIC-20 packaging and 1:2 frequency ratio, but uses 10.2 V VCC UVLO turn-on and 0.5 V UVLO hysteresis instead of 16 V / 6.3 V. | Better suited for low-input-voltage systems (e.g., 100–120 VAC only) where lower UVLO improves efficiency during brownout. | Choose UCC28517DWR if operating exclusively on 100–120 VAC; retain UCC28516DWR for universal 85–265 VAC support. |
Compared with UCC28516N, UCC28516DWR offers superior thermal performance and SMT manufacturability; versus UCC28517DWR, it provides higher UVLO hysteresis for stable operation across wide AC input ranges-making UCC28516DWR the optimal choice for universal-input, high-reliability power systems.
Availability
UCC28516DWR is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server PSUs, and medical equipment power modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UCC28516DWR 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 control architectures.
The UCC28516DWR belongs to TI's UCC2851x family of combination PFC/PWM controllers, designed specifically for cost-sensitive, high-efficiency AC/DC front-ends requiring IEC 61000-3-2 compliance and robust transient response.
FAQ
What is the PFC:PWM frequency ratio supported by the UCC28516DWR?
The UCC28516DWR supports a fixed 1:2 PFC:PWM frequency ratio - meaning the PWM stage operates at twice the frequency of the PFC stage (e.g., ~100 kHz PFC / ~200 kHz PWM). This ratio is hard-coded in silicon and cannot be changed. It minimizes boost capacitor ripple and improves dynamic response compared to 1:1 configurations. The oscillator frequency is set by the RT resistor, and the PFC stage divides the CT_BUFF signal internally.
How does the UCC28516DWR implement zero power detection?
The UCC28516DWR monitors the VAOUT pin voltage to detect zero power conditions. When VAOUT falls below 0.33 V (with 40–140 mV hysteresis), the internal zero power comparator disables GT1, halting PFC switching. This feature is active only after startup and ensures no-load power consumption remains below 0.5 W. The UCC28516DWR's VAOUT output must be properly compensated (via external RC network to GND) for stable detection across temperature and line conditions.
Can the UCC28516DWR drive SiC MOSFETs directly?
The UCC28516DWR's GT1 and GT2 outputs provide 2-A source / 3-A sink capability into 1-nF loads, with 16-ns rise and 7-ns fall times - sufficient for driving low-to-medium gate charge SiC MOSFETs (Qg ≤ 35 nC) in sub-300 W applications. However, for higher-power SiC designs (>400 W), external gate drivers are recommended to ensure adequate dV/dt control and reduce switching losses. The UCC28516DWR itself does not include negative turn-off voltage or Miller clamp features required for robust SiC gate control.
What is the purpose of the CT_BUFF pin on the UCC28516DWR?
The CT_BUFF pin on the UCC28516DWR provides an internally buffered copy of the PWM oscillator ramp (4-V amplitude, 200-kHz typical), used primarily to inject slope compensation into the ISENSE2 pin for stable peak-current-mode control. Connecting a resistor from CT_BUFF to ISENSE2 sums the ramp with the current sense signal, preventing subharmonic oscillation in continuous conduction mode. Unlike the raw oscillator node, CT_BUFF can drive a 500-µA resistive load without distortion - making it ideal for direct slope compensation implementation.
Does the UCC28516DWR support discontinuous conduction mode (DCM) in the PFC stage?
No, the UCC28516DWR is designed exclusively for average-current-mode control in continuous conduction mode (CCM) PFC operation. Its multiplier architecture, current amplifier, and voltage feedforward circuitry assume CCM behavior across full line and load ranges. Attempting DCM operation results in distorted line current, poor power factor, and potential instability. For DCM PFC applications, TI recommends dedicated controllers such as the UCC28051 or UCC28063 - not the UCC28516DWR.
UCC28516DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Mode:
- Average Current
- Frequency - Switching:
- 200kHz
- Current - Startup:
- 100 µA
- Voltage - Supply:
- 9.7V ~ 18V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UCC28516DWR FAQ
1.How can I place an order for UCC28516DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28516DWR 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 UCC28516DWR reliable?
The price and inventory of UCC28516DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28516DWR is usually 5 days.
3.What payment methods are accepted for UCC28516DWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28516DWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28516DWR?
UCC28516DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28516DWR 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 UCC28516DWR?
For technical support, including UCC28516DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28516DWR requirements.
6.How does Aetrix verify that UCC28516DWR is sourced from the original manufacturer or authorized distributors?
All UCC28516DWR 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 UCC28516DWR meets industry standards.
7.What is the process for return or replacement of UCC28516DWR?
All UCC28516DWR units undergo pre-shipment inspection (PSI). If there is an issue with UCC28516DWR, 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 UCC28516DWR part is unused and in its original packaging.
Return procedure for UCC28516DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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