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Texas Instruments UCC28517NG4
- Part No.:
- UCC28517NG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC28517NG4.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,903
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Product details
Overview
UCC28517NG4 from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM control in a single 20-pin PDIP (N) package. It delivers 2-A source / 3-A sink gate drive for both stages, supports 1:2 PFC:PWM frequency ratio (PWM at 2× PFC), features programmable maximum duty cycle clamp, soft-start, and zero power detect. It targets IEC61000-3-2-compliant AC/DC front-ends in industrial power supplies and server PSUs.
For engineers reviewing the UCC28517NG4 datasheet, UCC28517NG4 pinout, UCC28517NG4 application, or UCC28517NG4 equivalent, key selection criteria include its 1:2 frequency option, UVLO2 turn-off threshold of 3.55 V, 7.5-V precision reference, and dual gate drivers optimized for boost PFC + flyback/buck-derived PWM topologies.
Technical Context
The UCC28517NG4 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 (gM = 70–130 µS) for fast load transient response.
The PWM stage employs peak-current-mode control with slope compensation via CT_BUFF, programmable D_MAX clamp (70–80% max duty), 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 PWM remains active until PFC output drops to 47% of nominal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PWM operates at twice the PFC switching frequency, enabling higher PWM resolution and reduced output filter size. |
| UVLO2 Turn-Off Threshold | 3.55 V - Ensures controlled PWM shutdown during brownout when PFC output falls below 47% of nominal. |
| Reference Voltage | 7.5 V ±15 mV - Precision internal reference powering internal comparators and external bias networks. |
| Gate Drive Strength | 2-A source / 3-A sink per output - Directly drives MOSFET gates without external buffers in typical 300–500 W designs. |
| Zero Power Detect Threshold | 0.33 V (falling edge) - Disables PFC gate drive when VAOUT drops below threshold, eliminating standby losses. |
| Maximum Duty Cycle Clamp | 70–80% - Programmable via D_MAX pin to prevent transformer saturation in forward/flyback topologies. |
| Soft-Start Discharge Current | 6–14 mA - Enables rapid PWM disable during fault conditions by quickly discharging SS2 capacitor. |
Pinout & Package
UCC28517NG4 is housed in a 20-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and standard through-hole mounting. Thermal performance supports 1 W power dissipation at TJ ≤ 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC Gate Driver Output | 2-A source / 3-A sink totem-pole driver for boost switch; disabled outside UVLO window. |
| GT2 (10) | PWM Gate Driver Output | Identical drive strength to GT1; PWM activation sequenced after PFC output stabilization. |
| VSENSE (3) | PFC Voltage Feedback Input | Inverting input to transconductance amplifier; also feeds OVP, ENABLE, and UVLO2 comparators. |
| VAOUT (1) | PFC Voltage Amplifier Output | Regulates PFC output; sinks up to 3.3 mA during slew enhancement; triggers zero-power detect at 0.33 V. |
| IAC (18) | PFC Line Voltage Sensing Input | Current input proportional to rectified line voltage; max 500 µA for accurate feedforward scaling. |
| VFF (19) | PFC Voltage Feedforward Output | Sources IAC/2 current; external RC filter sets feedforward gain to maintain near-unity power factor. |
| SS2 (13) | PWM Soft-Start Control | Capacitor-connected node charged at 10.5 µA to ramp PWM duty; rapidly discharged on fault. |
| D_MAX (4) | PWM Max Duty Clamp Input | Analog voltage (0.09–0.90 V) linearly sets 70–80% max duty cycle to prevent transformer saturation. |
| CT_BUFF (5) | PWM Oscillator Ramp Buffer | 4-V amplitude buffered ramp used directly for slope compensation via resistor to ISENSE2. |
| VREF (20) | 7.5-V Precision Reference | Stable 7.5-V output with ±15 mV tolerance; powers internal circuitry and external divider networks. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC+PWM Control | Single-chip solution eliminates timing skew between stages and reduces BOM count vs. discrete controllers. |
| LEPFC + TEM PWM Modulation | Leading-edge PFC + trailing-edge PWM minimizes boost capacitor RMS current by >30% vs. TEM/TEM. |
| Programmable PWM Frequency Ratio | 1:2 ratio enables higher PWM resolution and improved dynamic response in flyback and forward converters. |
| Enhanced Transient Response | Transconductance voltage amplifier with slew-rate enhancement recovers PFC regulation in <100 µs. |
| Accurate Power Limiting | Multiplier-based power limit (IMOUT × VFF) provides stable over-power protection across line/load range. |
| Zero Power Detection | Hardware comparator disables PFC gate drive when VAOUT falls below 0.33 V, eliminating no-load consumption. |
Applications
| Industrial AC/DC Power Supplies | Server & Telecom PSUs |
|---|---|
|
Use Scenario: 500-W open-frame power supply for programmable logic controllers (PLCs) operating from 85–264 VAC input. IC Role / Device Role / Timing Role: UCC28517NG4 controls boost PFC stage (CCM) and isolated flyback PWM stage with synchronized LEM/TEM modulation. Use Value: Meets IEC61000-3-2 Class A harmonic limits while reducing boost capacitor stress via minimized ripple current. |
Use Scenario: Redundant 800-W PSU in 1U server chassis requiring high efficiency and low THD. IC Role / Device Role / Timing Role: UCC28517NG4 manages two-stage conversion: continuous-conduction-mode PFC followed by resonant LLC or flyback PWM. Use Value: 1:2 frequency ratio allows finer PWM duty control and tighter output regulation under transient load steps. |
| Medical Equipment Power Modules | Test & Measurement Instrumentation |
|
Use Scenario: 300-W medical-grade AC/DC module certified to IEC60601-1 with reinforced isolation and low leakage. IC Role / Device Role / Timing Role: UCC28517NG4 implements PFC + optocoupler-isolated flyback, with UVLO2 hysteresis tuned for reliable brownout recovery. Use Value: Zero power detect cuts standby consumption to <150 mW, supporting Energy Star Tier 2 requirements. |
Use Scenario: Bench power supply with programmable output and low-noise operation for analog circuit validation. IC Role / Device Role / Timing Role: UCC28517NG4 configures boost PFC and synchronous buck-derived PWM with precise D_MAX clamping. Use Value: Programmable max duty cycle prevents inductor saturation during output short-circuit testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28517DW | Same electrical specs; SOIC-20 (DW) package instead of PDIP-20 (N); lower thermal resistance (0.7 W vs. 1 W rating). | Preferred for surface-mount production; requires PCB rework for through-hole legacy designs. | Select UCC28517DW for automated assembly; UCC28517NG4 for prototyping or repair where through-hole mounting is required. |
| UCC28516NG4 | Identical package and pinout; differs in UVLO2 hysteresis (3.2 V vs. 3.2 V) and turn-off threshold (3.55 V same), but uses 3.55 V/3.2 V UVLO2 profile. | Same functional behavior in brownout recovery; validated drop-in replacement in existing UCC28517NG4 layouts. | UCC28516NG4 offers identical timing and sequencing; suitable when sourcing flexibility is needed without layout change. |
Compared with UCC28517NG4, UCC28517DW enables higher-density SMT layouts and better thermal performance, while UCC28516NG4 provides second-source availability with identical pinout and startup/shutdown thresholds-both preserve the 1:2 frequency ratio and zero-power detect functionality critical for low-standby designs.
Availability
UCC28517NG4 is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, server PSUs, and medical equipment power modules requiring stable component supply and long-term lifecycle support.
Supply support for UCC28517NG4 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 UCC2851x family was designed specifically for cost-sensitive, high-efficiency two-stage AC/DC conversion systems requiring IEC61000-3-2 compliance, targeting industrial, telecom, and computing power supplies.
FAQ
What is the PFC:PWM frequency ratio supported by the UCC28517NG4?
The UCC28517NG4 supports a fixed 1:2 PFC:PWM frequency ratio - the PWM stage switches at twice the frequency of the PFC stage. This is confirmed in the "Available Options" table and oscillator description: for UCC28517N/UCC28517DW, PWM frequency is 2× PFC frequency. The ratio is hard-coded by internal logic and cannot be changed externally.
Does the UCC28517NG4 provide hardware-based zero power detection?
Yes, the UCC28517NG4 integrates a dedicated zero power detect comparator monitoring VAOUT. When VAOUT falls below 0.33 V (typical, falling edge), the comparator forces GT1 gate drive to zero, disabling the PFC stage. This feature is documented in the Electrical Characteristics table and Detailed Pin Descriptions for VAOUT (Pin 1).
What is the UVLO2 turn-off threshold for the UCC28517NG4 PWM stage?
The UCC28517NG4 has a UVLO2 turn-off threshold of 3.55 V, as specified in the Electrical Characteristics table under "PWM stage undervoltage lockout (UVLO2)" for devices UCC28512, UCC28513, UCC28516, and UCC28517. This ensures PWM remains active until the PFC output decays to 47% of nominal before shutdown.
Can the UCC28517NG4 drive MOSFET gates directly without external buffers?
Yes, the UCC28517NG4 provides 2-A source and 3-A sink peak current per gate driver (GT1 and GT2), with rise/fall times of 16 ns / 7 ns into 1-nF loads. These specifications enable direct drive of medium-power MOSFETs (e.g., 600-V, 20–50 nC Qg) commonly used in 300–600 W PFC and PWM stages.
How is the maximum PWM duty cycle programmed on the UCC28517NG4?
The maximum PWM duty cycle is set via the D_MAX pin (Pin 4): applying a DC voltage between 0.09 V and 0.90 V linearly programs a 70–80% clamp. A precision resistor divider from VREF (7.5 V) is recommended. Voltages below 0.7 V force 0% duty cycle, as stated in the Detailed Pin Descriptions section for D_MAX.
UCC28517NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
UCC28517NG4 FAQ
1.How can I place an order for UCC28517NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28517NG4 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 UCC28517NG4 reliable?
The price and inventory of UCC28517NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28517NG4 is usually 5 days.
3.What payment methods are accepted for UCC28517NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28517NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28517NG4?
UCC28517NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28517NG4 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 UCC28517NG4?
For technical support, including UCC28517NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28517NG4 requirements.
6.How does Aetrix verify that UCC28517NG4 is sourced from the original manufacturer or authorized distributors?
All UCC28517NG4 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 UCC28517NG4 meets industry standards.
7.What is the process for return or replacement of UCC28517NG4?
All UCC28517NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC28517NG4, 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 UCC28517NG4 part is unused and in its original packaging.
Return procedure for UCC28517NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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