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Texas Instruments UCC3817NG4
- Part No.:
- UCC3817NG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UCC3817NG4.pdf
- Description:
- IC PFC CTR AV CURR 220KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,578
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Product details
Overview
UCC3817NG4 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 features a 7.5-V reference, 16-V UVLO turn-on threshold, leading-edge PWM modulation, and integrated gate driver with 93–99% duty cycle range - used in IEC61000-3-2-compliant sub-300-W AC/DC supplies.
For engineers reviewing the UCC3817NG4 datasheet, UCC3817NG4 pinout, UCC3817NG4 application, or UCC3817NG4 equivalent, key selection considerations include its 0°C to 70°C operating temperature range, SOIC-16 package, 6–220 kHz programmable oscillator, 150 µA start-up current, and compatibility with universal AC input (85–265 VAC) systems requiring high noise immunity and feed-forward line regulation.
Technical Context
The UCC3817NG4 employs average current-mode control with a wide-bandwidth current amplifier (±2 mV offset), analog multiplier (K = 0.5–1.5 V⁻¹), and voltage error amplifier (90 dB open-loop gain) to shape input current waveform in phase with rectified AC line voltage. Its zero-power comparator triggers at 0.33 V on VAOUT to disable gate drive during no-load conditions.
It integrates a 7.5-V precision reference (±1.5% over temp), UVLO with 16 V/9.7 V hysteresis, overvoltage protection (OVP/EN window comparator with 1.9 V enable threshold and 500 mV hysteresis), and soft-start via SS pin with 10 µA charge current - all optimized for stable, low-distortion PFC operation without external compensation for basic configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-On | 16 V - ensures reliable startup only after bulk capacitor reaches sufficient voltage; prevents erratic operation during brownout |
| Reference Voltage | 7.5 V ±1.5% - provides stable bias for internal amplifiers and external circuitry; supports 20 mA load capability |
| Oscillator Range | 6–220 kHz - set by RT/CT network; enables optimization of EMI, efficiency, and magnetics size in boost PFC stage |
| Start-Up Current | 150 µA typical - minimizes auxiliary supply burden during initial power-up before main PFC loop engages |
| Gate Drive Output | DRVOUT totem-pole driver - delivers up to 1.2 A peak sink / 0.9 A peak source; supports direct MOSFET gate driving with external series resistor |
| Operating Temp | 0°C to 70°C - defines commercial-grade thermal envelope; distinct from UCC2817's –40°C to 85°C industrial rating |
| Peak Current Limit | PKLMT pin threshold at 0 V - enables precise, resistor-programmable peak inductor current limiting for overcurrent protection |
Pinout & Package
UCC3817NG4 is housed in a 16-pin SOIC (D) package with 3.91 mm × 9.9 mm body size and standard 1.27 mm pitch. Pin 1 is located at the top-left corner adjacent to the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1) | Power and signal reference ground | All internal voltages referenced here; requires low-inductance 0.1 µF ceramic bypass to VCC and VREF |
| PKLMT (2) | Peak current limit sense input | 0 V threshold detects overcurrent; level-shifted via resistor divider from current-sense resistor negative terminal |
| CAOUT (3) | Current amplifier output | Drives PWM latch; compensation network placed between CAOUT and MOUT for stability and bandwidth control |
| CAI (4) | Current amplifier non-inverting input | Connected to GND-side of current-sense resistor; operates down to and below GND for bidirectional sensing |
| MOUT (5) | Multiplier output / current amp inverting input | High-impedance node combining multiplier current and differential amplifier input; enables leading-edge modulation |
| IAC (6) | Line voltage proportional current input | Accepts ≤500 µA current proportional to rectified AC line; core input to analog multiplier for feed-forward control |
| VAOUT (7) | Voltage error amplifier output | Regulates boost output voltage; internally clamped to ~5.5 V; feeds multiplier as VAOUT − 1 term in gain equation |
| VFF (8) | Feed-forward RMS voltage input | Generated by mirroring ½ IAC through external RC filter; sets VFF = 1.4 V at low line to maintain constant power |
| VREF (9) | 7.5 V precision reference output | Stable bias source for external circuits; disabled below UVLO; short-circuit protected; requires 0.1 µF bypass |
| OVP/EN (10) | Overvoltage protection / enable input | Window comparator: disables DRVOUT if boost voltage exceeds programmed threshold or forces shutdown if pulled <1.9 V |
| VSENSE (11) | Voltage amplifier inverting input | Connected to output voltage divider; forms feedback loop with VAOUT to regulate DC bus at target value |
| RT (12) | Oscillator timing resistor connection | 10–100 kΩ to GND sets charging current; nominal 3 V bias enables accurate frequency programming |
| SS (13) | Soft-start control input | Charged by 10 µA current source; ramps VAOUT-equivalent signal to limit inrush and prevent overshoot at startup |
| CT (14) | Oscillator timing capacitor connection | Capacitor to GND sets frequency per f ≈ 0.6/(RT × CT); short, direct trace required for jitter reduction |
| VCC (15) | Positive supply input | 10–17 V operation; ≥20 mA supply capability; bypassed directly to GND to support gate-drive current spikes |
| DRVOUT (16) | Integrated MOSFET gate driver output | Totem-pole output drives boost switch gate; rise/fall times ≤50 ns into 1 nF; requires series gate resistor for damping |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-distortion sinusoidal line current without slope compensation; improves light-load THD vs peak-mode alternatives |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC converter to reduce bulk capacitor ripple current, extending electrolytic capacitor lifetime |
| Integrated 7.5-V reference | ±1.5% accuracy over temperature; delivers 20 mA; eliminates need for external reference in most PFC designs |
| Feed-forward line regulation | VFF input compensates for line voltage variation in real time, maintaining constant power delivery across 85–265 VAC range |
| Zero-power detection | Comparator monitors VAOUT; latches DRVOUT low when output falls below 0.33 V, eliminating standby power loss |
| Low start-up current | 150 µA typical enables use of high-value, cost-effective startup resistors; reduces auxiliary supply losses |
Applications
| PC Power Supply | Consumer Electronics Adapter |
|---|---|
|
Use Scenario: 200–300 W ATX main power supply with active PFC stage preceding LLC resonant converter. IC Role / Device Role / Timing Role: UCC3817NG4 controls boost preregulator to enforce IEC61000-3-2 Class D compliance and deliver regulated 380 VDC bus. Use Value: Achieves >0.99 power factor and <10% THD at full load using average current-mode control and feed-forward compensation. |
Use Scenario: Universal-input 90 W laptop adapter meeting ENERGY STAR Tier 2 and CoC v5 efficiency requirements. IC Role / Device Role / Timing Role: UCC3817NG4 implements critical conduction mode (CRM) boost PFC to minimize EMI filter size and improve light-load efficiency. Use Value: Enables 92% peak efficiency and 0.25 W no-load consumption via zero-power detection and low start-up current. |
| LED Driver Front-End | Industrial AC/DC Module |
|
Use Scenario: 150 W constant-current LED driver for street lighting with surge-rated front-end and dimming interface. IC Role / Device Role / Timing Role: UCC3817NG4 regulates boost output to 400 VDC, feeding isolated flyback stage while providing OVP/EN fault signaling. Use Value: Integrated OVP/EN pin allows direct connection to output divider for fast shutdown (<500 ns propagation delay) during overvoltage events. |
Use Scenario: DIN-rail mounted 250 W industrial AC/DC module with extended hold-up time and wide ambient temperature range. IC Role / Device Role / Timing Role: UCC3817NG4 manages boost PFC stage with programmable 100 kHz switching to balance efficiency, magnetics size, and thermal performance. Use Value: RT/CT programmability allows precise frequency tuning to avoid audible noise bands and meet EN55022 Class B conducted EMI limits. |
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 |
|---|---|---|---|
| UCC2817N | Same pinout and function but rated for –40°C to +85°C; higher UVLO hysteresis (6.3 V vs 5.8 V); tighter VREF tolerance (±1.3% vs ±1.5%) | Required for industrial environments; supports wider input voltage derating at cold temperature extremes | Select UCC2817N when operating below 0°C or above 70°C; otherwise UCC3817NG4 is cost-optimized for commercial use |
| ICE3PCS01G | Fixed-frequency CCM controller; no soft-start pin; different multiplier architecture; 12 V UVLO; smaller SO-16 package (3.9 × 4.9 mm) | Targets cost-sensitive consumer adapters; lacks zero-power detection and feed-forward flexibility of UCC3817NG4 | Choose ICE3PCS01G for simplified layout and lower BOM count where CRM operation and ultra-low no-load loss are not required |
Compared with UCC2817N and ICE3PCS01G, the UCC3817NG4 offers the best balance of design flexibility (RT/CT programmability, feed-forward, zero-power), commercial-temperature reliability, and proven implementation maturity in PC and industrial power supplies - without requiring PCB redesign or firmware changes.
Availability
UCC3817NG4 is available at Aetrix Electronics and suitable for PC power supplies, consumer electronics adapters, LED driver front-ends, and industrial AC/DC modules requiring stable component supply and long-term production continuity.
Supply support for UCC3817NG4 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 technologies with over 50 years of power conversion innovation.
The UCC3817NG4 belongs to TI's legacy BiCMOS PFC controller product line, designed specifically for cost-effective, high-reliability active power factor correction in sub-300 W universal-input AC/DC systems.
FAQ
What is the operating temperature range of the UCC3817NG4?
The UCC3817NG4 is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade rating distinguishes it from the UCC2817N, which supports –40°C to +85°C. The UCC3817NG4's electrical characteristics - including reference voltage accuracy, oscillator stability, and amplifier offset - are guaranteed within this range, making it ideal for indoor, temperature-controlled applications like desktop PC power supplies and consumer adapters where extended thermal margins are not required. Always verify board-level thermal performance under worst-case airflow and load conditions.
How does the UCC3817NG4 implement power factor correction?
The UCC3817NG4 achieves near-unity power factor using average current-mode control in a boost topology. It senses the AC line voltage via IAC current input and the inductor current via CAI/MOUT differential pair, then computes the required duty cycle using an analog multiplier (VAOUT, IAC, VFF). The resulting current command shapes the input current waveform to match the voltage waveform, reducing harmonic distortion and meeting IEC61000-3-2 Class D limits. Unlike peak-current-mode controllers, this method eliminates need for slope compensation and improves noise immunity at light loads - a key advantage confirmed in UCC3817NG4 application testing.
What is the purpose of the VFF pin on the UCC3817NG4?
The VFF (feed-forward voltage) pin on the UCC3817NG4 accepts a scaled RMS representation of the rectified AC line voltage, generated externally by mirroring half the IAC current through an RC filter. At low line (e.g., 85 VAC), VFF ≈ 1.4 V; at high line (265 VAC), VFF ≈ 4.7 V. This signal dynamically adjusts the multiplier gain to maintain constant power delivery across universal input ranges - preventing overcurrent at high line and ensuring stable regulation at low line. The UCC3817NG4's VFF path is integral to its ability to meet IEC61000-3-2 without additional digital compensation or microcontroller intervention.
Can the UCC3817NG4 be used in discontinuous conduction mode (DCM)?
Yes, the UCC3817NG4 supports operation in discontinuous conduction mode (DCM), though it is primarily optimized for continuous conduction mode (CCM) and transition mode (CRM). Its average current-mode architecture inherently stabilizes DCM operation without slope compensation, and the PKLMT pin allows precise peak current limiting to prevent saturation during boundary transitions. However, for dedicated DCM/CRM applications requiring minimal component count and lowest EMI, TI recommends pairing the UCC3817NG4 with appropriate magnetics and CT/RT values - as validated in SLUS395K Figure 16 - rather than forcing DCM operation outside its recommended 6–220 kHz oscillator range.
What is the maximum gate drive current capability of the UCC3817NG4 DRVOUT pin?
The UCC3817NG4 DRVOUT pin delivers up to 1.2 A peak sink current and approximately 900 mA peak source current, enabled by its internal totem-pole MOSFET driver. These values are measured into a capacitive load with CL = 1 nF and RL = 10 Ω, yielding rise/fall times ≤50 ns. To prevent overshoot and ringing, TI specifies a minimum series gate resistor (e.g., 11 Ω at 18 V VCC and 1.2 A sink) calculated from pulldown resistance (4 Ω typical) and system requirements. This drive strength allows direct interfacing with medium-power MOSFETs (e.g., 600 V, 20–50 A) commonly used in 200–300 W boost PFC stages without external drivers - a verified capability in UCC3817NG4 reference designs.
UCC3817NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Mode:
- Average Current
- Frequency - Switching:
- 6kHz ~ 220kHz
- Current - Startup:
- 150 µA
- Voltage - Supply:
- 12V ~ 17V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UCC3817NG4 FAQ
1.How can I place an order for UCC3817NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3817NG4 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 UCC3817NG4 reliable?
The price and inventory of UCC3817NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3817NG4 is usually 5 days.
3.What payment methods are accepted for UCC3817NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3817NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3817NG4?
UCC3817NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3817NG4 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 UCC3817NG4?
For technical support, including UCC3817NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3817NG4 requirements.
6.How does Aetrix verify that UCC3817NG4 is sourced from the original manufacturer or authorized distributors?
All UCC3817NG4 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 UCC3817NG4 meets industry standards.
7.What is the process for return or replacement of UCC3817NG4?
All UCC3817NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UCC3817NG4, 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 UCC3817NG4 part is unused and in its original packaging.
Return procedure for UCC3817NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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