My Inquiry
My Account
Texas Instruments UCC28516NG4
- Part No.:
- UCC28516NG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC28516NG4.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,995
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UCC28516NG4 from Texas Instruments is a dual-stage combination controller integrating average-current-mode PFC and peak-current-mode PWM stages 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 (e.g., 100 kHz PFC / 200 kHz PWM), features input voltage feedforward, programmable soft-start, and zero power detect. It targets IEC61000-3-2-compliant AC-DC front-end power supplies such as server PSUs and industrial SMPS.
For engineers reviewing the UCC28516NG4 datasheet, UCC28516NG4 pinout, UCC28516NG4 application, or UCC28516NG4 equivalent, key selection criteria include its 1:2 frequency option, dual UVLO thresholds (16 V turn-on / 3.55 V PWM turn-off), 7.5-V precision reference, and leading-edge PFC + trailing-edge PWM modulation architecture to minimize boost capacitor ripple.
Technical Context
The UCC28516NG4 implements a three-input analog multiplier with voltage feedforward (VFF) and transconductance voltage amplifier (VAOUT) to generate a highly linear line-current reference for continuous conduction mode (CCM) PFC. Its PFC stage uses average-current-mode control with zero-power detection below 0.33 V on VAOUT and accurate power limiting via PKLMT.
The PWM stage operates at twice the PFC frequency (1:2 ratio), employs peak-current-mode control with slope compensation via CT_BUFF, and includes programmable maximum duty cycle clamping (70–80% range), soft-start via SS2 capacitor, and independent UVLO2 (3.55 V turn-off). Sequencing ensures PWM enables only after PFC output reaches 90% of regulation and disables when PFC drops to 47%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PFC:PWM Frequency Ratio | 1:2 - PWM runs at double PFC frequency (e.g., 200 kHz PWM / 100 kHz PFC), reducing boost capacitor RMS current and enabling smaller bulk capacitance. |
| VCC UVLO Turn-On / Turn-Off | 16 V / 9.7 V - Ensures reliable startup above brownout and graceful shutdown during line sag; hysteresis = 6.3 V. |
| PWM UVLO2 Threshold | 3.55 V turn-off - Delays PWM disable until PFC output decays to 47% of nominal, maintaining hold-up time during line dropout. |
| Reference Voltage | 7.5 V ±15 mV - High-accuracy internal reference powering internal comparators and external resistor dividers (e.g., for D_MAX or PKLMT). |
| Gate Drive Capability | 2-A source / 3-A sink per output (GT1, GT2) - Directly drives medium-power MOSFETs without external buffers in <300 W applications. |
| Rise/Fall Time (1 nF load) | 16 ns rise / 7 ns fall - Enables fast switching transitions while maintaining noise immunity via controlled edge rates. |
| Zero Power Detect Threshold | 0.33 V on VAOUT (falling edge) - Disables PFC gate drive when output power falls near zero, eliminating no-load consumption. |
Pinout & Package
UCC28516NG4 is housed in a 20-pin plastic dual in-line package (PDIP-N), RoHS-compliant, with 0.3-inch body width and through-hole mounting. Thermal performance rated at 1 W power dissipation (TJ = −55°C to +150°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GT1 (12) | PFC gate driver output | 2-A source / 3-A sink totem pole driving boost MOSFET; disabled outside UVLO and before VREF stabilization. |
| GT2 (10) | PWM gate driver output | Identical drive strength to GT1; enabled only after PFC output reaches 90% of target and disabled at 47%. |
| VSENSE (3) | PFC voltage feedback input | Inverting input to transconductance amplifier; also feeds OVP, ENABLE, and UVLO2 comparators for integrated protection. |
| VAOUT (1) | PFC voltage amplifier output | Transconductance output regulating PFC output voltage; sinks up to 3.3 mA during slew enhancement; zero-power detect trigger at 0.33 V. |
| IAC (18) | PFC line voltage sensing input | Current input proportional to rectified AC line; max 500 µA; feeds analog multiplier with VFF for feedforward line regulation. |
| VFF (19) | Voltage feedforward input | Sources IAC/2 current; external RC filter sets feedforward gain to maintain constant power across line variations. |
| PKLMT (14) | PFC peak current limit input | Voltage threshold input (0 V reference); used with resistor divider to set overcurrent trip point across PFC sense resistor. |
| SS2 (13) | PWM soft-start input | Capacitor-connected node charged by 10.5 µA current; ramps VERR to control PWM duty-cycle ramp-up time. |
| D_MAX (4) | PWM max duty clamp input | DC voltage (0.09–0.90 V) setting 70–80% max duty cycle; enables safe operation in flyback/forward topologies. |
| VREF (20) | Internal reference output | 7.5-V ±15 mV precision reference; supplies bias for internal circuits and external programming resistors (e.g., RT, D_MAX). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PFC + PWM control | Single-chip solution eliminates timing skew between stages and reduces BOM count vs. discrete controllers. |
| Leading-edge PFC + trailing-edge PWM | Minimizes ripple current in boost output capacitor-critical for reliability and size reduction in high-power SMPS. |
| Programmable PWM frequency ratio | 1:2 option (UCC28516NG4) allows higher PWM switching for smaller magnetics while keeping PFC in optimal CCM range. |
| Independent dual UVLO | Separate VCC UVLO (16 V/9.7 V) and PWM UVLO2 (6.75 V turn-on / 3.55 V turn-off) enable staged power sequencing and extended hold-up. |
| Zero power detect | Turns off PFC gate drive when VAOUT falls below 0.33 V, eliminating standby losses without auxiliary circuitry. |
| High-current gate drivers | 2-A source / 3-A sink per output supports direct drive of 100–200 mΩ MOSFETs in sub-300 W designs, reducing layout complexity. |
Applications
| Server Power Supply | Industrial AC-DC Adapter |
|---|---|
|
Use Scenario: 80 PLUS Titanium-certified 1 kW front-end with boost PFC + LLC resonant PWM stage. IC Role / Device Role / Timing Role: UCC28516NG4 provides synchronized PFC (100 kHz) and PWM (200 kHz) control with feedforward line regulation and zero-power shutdown. Use Value: 1:2 frequency ratio reduces boost capacitor RMS current by ~30%, enabling smaller 470 µF/450 V electrolytics instead of 680 µF. |
Use Scenario: DIN-rail mounted 48 V/20 A industrial power module with wide input (85–264 VAC) and 50°C ambient operation. IC Role / Device Role / Timing Role: UCC28516NG4 manages CCM boost PFC and flyback PWM with programmable D_MAX clamp for transformer saturation margin. Use Value: Dual UVLO (16 V start / 3.55 V PWM stop) extends hold-up time to >18 ms during 110 VAC brownout, meeting EN 61000-4-11 immunity. |
| Medical Imaging PSU | Telecom Rectifier |
|
Use Scenario: Low-noise 24 V/30 A power supply for MRI subsystem requiring <0.5% output ripple and IEC 60601-1 compliance. IC Role / Device Role / Timing Role: UCC28516NG4 executes average-current PFC with input voltage feedforward and peak-current PWM with slope compensation. Use Value: Leading-edge PFC + trailing-edge PWM cuts boost capacitor ripple current by 45% vs. TEM/TEM, lowering EMI filter size and cost. |
Use Scenario: -48 V telecom rectifier with hot-swap capability and 3000 VAC isolation, operating continuously at 60°C ambient. IC Role / Device Role / Timing Role: UCC28516NG4 controls boost PFC and forward-derived PWM with zero-power detect to meet GR-902-CORE standby loss limits. Use Value: VAOUT slew enhancement and zero-power threshold at 0.33 V reduce no-load input power to <300 mW, exceeding Level VI efficiency requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC+PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28516DWR | Same electrical specs and pinout; SOIC-20 (DW) package with tape-and-reel packaging (R suffix), 0.7 W thermal rating vs. 1 W for NG4. | Preferred for automated SMT assembly; requires PCB redesign due to surface-mount footprint and lower power dissipation margin. | Select UCC28516DWR for volume production with pick-and-place lines; retain UCC28516NG4 for prototyping or high-temperature through-hole designs. |
| UCC28070 | Dual-phase interleaved CCM PFC only (no integrated PWM); 115 VAC–265 VAC input; no PWM gate drivers or UVLO2. | Requires separate PWM controller (e.g., UCC2891); suited for >1 kW systems where interleaving reduces input filter size. | Choose UCC28070 only when interleaved PFC is mandatory and PWM stage is independently controlled; not a functional substitute for UCC28516NG4. |
Compared with UCC28516DWR, UCC28516NG4 offers higher thermal margin (1 W vs. 0.7 W) and through-hole assembly compatibility, while UCC28070 lacks integrated PWM functionality entirely-making it unsuitable as a drop-in replacement but viable only in split-controller architectures.
Availability
UCC28516NG4 is available at Aetrix Electronics and suitable for server power supplies, industrial AC-DC adapters, medical imaging PSUs, telecom rectifiers, and DIN-rail power modules requiring stable component supply and long-term obsolescence management.
Supply support for UCC28516NG4 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 UCC28516NG4 belongs to TI's UCC2851x family of combination PFC/PWM controllers, designed specifically for cost-sensitive, space-constrained AC-DC front-ends requiring IEC61000-3-2 compliance and robust hold-up performance.
FAQ
What is the PFC:PWM frequency ratio supported by the UCC28516NG4?
The UCC28516NG4 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 is confirmed in the "Available Options" table and oscillator section of the SLUS517C datasheet. The ratio is hard-coded per device variant and cannot be changed externally. UCC28516NG4 is explicitly listed in the 1:2 row alongside UCC28514–UCC28517.
Does the UCC28516NG4 include an integrated 7.5-V reference, and what is its accuracy?
Yes, the UCC28516NG4 includes an internal 7.5-V precision reference (VREF, Pin 20) with ±15 mV initial accuracy over temperature (7.35 V to 7.65 V). It delivers up to 10 mA and is internally current-limited to 25 mA for short-circuit protection. The reference powers internal comparators and serves as a stable bias source for external resistor networks controlling D_MAX, PKLMT, and RT.
How does the zero power detect function work in the UCC28516NG4?
The UCC28516NG4 implements zero power detect by monitoring the VAOUT pin: when VAOUT falls below 0.33 V (falling edge, ±0.14 V hysteresis), the PFC gate drive (GT1) is forcibly disabled. This occurs during no-load or very light-load conditions, eliminating idle power draw in the PFC stage without requiring auxiliary circuitry. The threshold is internally fixed and unadjustable.
What are the UVLO thresholds for the UCC28516NG4, and how do they differ between PFC and PWM stages?
The UCC28516NG4 has two independent UVLO circuits: VCC UVLO turns on at 16 V (±0.6 V) and off at 9.7 V (±0.9 V); PWM UVLO2 (UVLO2) turns on at 6.75 V and off at 3.55 V. This staged shutdown allows the PWM stage to remain active longer during line dropout-disabling only after PFC output decays to 47% of nominal-extending hold-up time beyond what single-threshold controllers achieve.
Can the UCC28516NG4 drive MOSFETs directly, and what are its gate drive specifications?
Yes, the UCC28516NG4 integrates two high-current totem-pole gate drivers: GT1 (PFC) and GT2 (PWM) each deliver 2-A source and 3-A sink capability. Rise/fall times are 16 ns/7 ns into 1-nF loads. These drivers support direct connection to MOSFETs with gate charges ≤30 nC in sub-300 W applications, eliminating need for external drivers in many designs.
UCC28516NG4 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
UCC28516NG4 FAQ
1.How can I place an order for UCC28516NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC28516NG4 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 UCC28516NG4 reliable?
The price and inventory of UCC28516NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC28516NG4 is usually 5 days.
3.What payment methods are accepted for UCC28516NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC28516NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC28516NG4?
UCC28516NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC28516NG4 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 UCC28516NG4?
For technical support, including UCC28516NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC28516NG4 requirements.
6.How does Aetrix verify that UCC28516NG4 is sourced from the original manufacturer or authorized distributors?
All UCC28516NG4 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 UCC28516NG4 meets industry standards.
7.What is the process for return or replacement of UCC28516NG4?
All UCC28516NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC28516NG4, 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 UCC28516NG4 part is unused and in its original packaging.
Return procedure for UCC28516NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UCC28516NG4 Tags
-
ICE2PCS01GXUMA1
Infineon Technologies
-
NCP1654BD133R2G
onsemi
-
MC33262DR2G
onsemi
-
ICE3PCS03GXUMA1
Infineon Technologies
-
NCP1631DR2G
onsemi
-
L4981BD013TR
STMicroelectronics
-
UCC28070DWR
Texas Instruments
-
UCC28070PWR
Texas Instruments
-
UC3854DWTR
Texas Instruments
-
L4981AD013TR
STMicroelectronics
-
UCC2817D
Texas Instruments
-
UC2854BDWTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
