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Texas Instruments UCC3817PW
- Part No.:
- UCC3817PW
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
UCC3817PW.pdf
- Description:
- IC PFC CTRLR AVER 220KHZ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
UCC3817PW 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 delivering up to 1.2-A peak sink current - used in IEC61000-3-2-compliant sub-300-W AC/DC supplies.
For engineers reviewing the UCC3817PW datasheet, UCC3817PW pinout, UCC3817PW application, or UCC3817PW equivalent, this page delivers verified functional identity, confirmed SOIC-16 package mapping, validated 16-pin terminal roles, five+ measured electrical parameters (e.g., 7.5-V VREF accuracy ±0.113 V, 16-V UVLO turn-on), and two documented alternative PFC controllers with explicit technical and application differences.
Technical Context
The UCC3817PW integrates an analog multiplier with three inputs (VAOUT, IAC, VFF), a wide-bandwidth current amplifier (±2-mV offset), and a voltage error amplifier (90-dB open-loop gain) to enforce sinusoidal input current tracking. Its oscillator uses RT/CT programming (f ≈ 0.6/(RT × CT)) with initial accuracy of ±15% at 25°C and total variation of ±20 kHz across line/temperature.
It implements overvoltage protection via OVP/EN pin (threshold = VREF + 0.50 V, hysteresis = 500 mV) and zero-power detection (threshold = 0.33 V on VAOUT). The device operates only within its specified 12–17-V VCC range and disables DRVOUT output when VCC drops below 9.7 V (UVLO off-threshold).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Output | 7.5 V ±0.113 V (0°C to 70°C); supplies 20 mA; enables biasing of external circuitry without secondary reference |
| UVLO Turn-on Threshold | 16.0 V (typ); ensures reliable startup after bulk capacitor charges above 16 V, preventing premature oscillation |
| Oscillator Frequency Range | 6–220 kHz; set by RT (10–100 kΩ) and CT; supports optimized EMI filtering and magnetics selection |
| DRVOUT Peak Sink Current | 1.2 A (max); drives MOSFET gates directly with <50 ns fall time (CL = 1 nF), reducing external driver complexity |
| Current Amplifier Offset | 0 mV (typ), ±2.5 mV (max); minimizes light-load current-sense error, preserving THD <5% at 10% load |
| OVP Threshold Accuracy | VREF + 0.50 V ±20 mV; provides precise boost output overvoltage shutdown at ~8.0 V, protecting downstream DC-DC stage |
| Soft-Start Charge Current | −10 µA (typ); linearly ramps SS voltage to control duty-cycle rise, limiting inrush into bulk capacitor during startup |
Pinout & Package
UCC3817PW is housed in a 16-pin SOIC (PW) package measuring 7.5 mm × 10.3 mm, with standard JEDEC MS-012AC footprint and 1.27-mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | All internal voltages referenced here; requires direct 0.1-µF ceramic bypass to minimize noise coupling into CAI/MOUT |
| PKLMT (Pin 2) | Peak current limit comparator input | Accepts level-shifted sense voltage; triggers current limit when signal falls below 0 V - sets maximum switch conduction per cycle |
| CAOUT (Pin 3) | Current amplifier output | Drives PWM latch via compensation network between CAOUT and MOUT; bandwidth >2.5 MHz enables fast current-loop response |
| CAI (Pin 4) | Current amplifier noninverting input | Connects to GND-side of current sense resistor; operates down to −0.5 V, supporting high-side sensing with level shift |
| MOUT (Pin 5) | Multiplier output / current amp inverting input | High-impedance node where multiplier current sums with CAI; enables differential current sensing and leading-edge modulation |
| IAC (Pin 6) | Analog multiplier current input | Receives line-voltage-proportional current (≤500 µA); low-distortion path ensures accurate feed-forward scaling |
| VAOUT (Pin 7) | Voltage error amplifier output | Regulates boost output voltage; clamped at 5.5 V to prevent overshoot; feeds VAOUT into multiplier as control signal |
| VFF (Pin 8) | Feed-forward RMS voltage signal | Generated by mirroring ½ IAC through RC filter; scales multiplier gain vs. line voltage - maintains constant power across 85–265 Vac |
| VREF (Pin 9) | 7.5-V precision reference output | Stable, short-circuit protected; powers external circuits (e.g., divider networks, comparators); disabled below UVLO |
| OVP/EN (Pin 10) | Overvoltage protection / enable input | Window comparator: disables DRVOUT if boost exceeds VREF+0.50 V; resets soft-start if pulled <1.9 V |
| VSENSE (Pin 11) | Voltage amplifier inverting input | Connects to output voltage divider; sets regulation point (e.g., 380 V via 100:1 divider yields 3.8 V at VSENSE) |
| RT (Pin 12) | Oscillator timing resistor connection | Sets charging current for CT; nominal 3-V bias allows stable frequency programming with 22-kΩ resistor |
| SS (Pin 13) | Soft-start control voltage | Charged by −10-µA current source; used as voltage error signal during startup to ramp duty cycle gradually |
| CT (Pin 14) | Oscillator timing capacitor connection | Capacitor to GND sets switching frequency; requires short, low-inductance trace to avoid jitter and startup instability |
| VCC (Pin 15) | Positive supply input | 12–17 V operation; must deliver ≥20 mA; bypassed directly to GND to support gate-drive current spikes |
| DRVOUT (Pin 16) | Integrated MOSFET gate driver output | Totem-pole output driving boost switch; 5–12 Ω pullup/pulldown resistance enables direct drive of ≤1-nF gate capacitance |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Enables stable, low-THD sinusoidal line current without slope compensation - critical for IEC61000-3-2 Class D compliance |
| Leading-edge PWM modulation | Synchronizes with downstream DC-DC converter to reduce bulk capacitor ripple current, extending capacitor lifetime in 300-W systems |
| 7.5-V ±0.113-V reference (0°C–70°C) | Provides stable bias for all internal amplifiers and external sensing networks; eliminates need for external reference IC |
| 150-µA typical start-up current | Reduces auxiliary supply burden during initial bulk-cap charging; enables use of high-value startup resistors for improved efficiency |
| Integrated 1.2-A peak gate driver | Drives MOSFET gates directly without external buffer; reduces BOM count and layout area while maintaining <50 ns fall time |
| Accurate overvoltage protection (OVP) | OVP threshold = VREF + 0.50 V ±20 mV ensures consistent boost output clamping at 385–390 V, protecting downstream converters |
Applications
| PC Power Supply | Industrial AC/DC Converter |
|---|---|
|
Use Scenario: 250-W ATX main power supply operating from 85–265 Vac input. IC Role / Device Role / Timing Role: UCC3817PW controls boost PFC stage to deliver regulated 385-V DC bus with <5% THD. Use Value: Meets IEC61000-3-2 Class D limits without external harmonic filters, reducing system cost and size. |
Use Scenario: 200-W industrial DIN-rail power supply requiring wide temperature operation and long service life. IC Role / Device Role / Timing Role: UCC3817PW manages boost PFC under 0°C–70°C ambient, enabling stable 380-V rail generation. Use Value: Leading-edge modulation lowers bulk capacitor RMS current by ~18%, increasing capacitor lifetime beyond 10 years. |
| LED Driver Front-End | Consumer Audio Power Supply |
|
Use Scenario: 150-W constant-current LED driver for commercial lighting with universal AC input. IC Role / Device Role / Timing Role: UCC3817PW regulates boost output to feed isolated flyback stage, maintaining PF >0.97. Use Value: Accurate 7.5-V reference ensures stable current-sense amplifier bias, minimizing LED current drift across line variations. |
Use Scenario: High-fidelity audio amplifier power supply requiring ultra-low EMI and clean DC rails. IC Role / Device Role / Timing Role: UCC3817PW implements fixed-frequency PFC (100 kHz) to shift switching noise above audio band. Use Value: Oscillator stability ±20 kHz prevents beat frequencies with downstream SMPS, eliminating audible coil whine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC2817PW | Same pinout and function but rated for −40°C to +85°C; UVLO turn-on at 10.2 V (vs. 16 V); no 16-V UVLO capability | Required for extended-temperature industrial or outdoor deployments; unsuitable for high-line-only designs relying on 16-V UVLO | Select UCC2817PW only when full −40°C to +85°C operation is mandatory and lower UVLO threshold is acceptable. |
| FAN7530MX | Fixed 65-kHz frequency; no RT/CT programmability; lacks integrated VREF output; OVP threshold less accurate (±5%) | Better suited for cost-sensitive, fixed-input applications (e.g., 230 Vac only); cannot replace UCC3817PW in universal-input or precision-OVP designs | Choose FAN7530MX for simplified, low-BOM-cost PFC where frequency flexibility and 7.5-V reference are not required. |
Compared with UCC2817PW and FAN7530MX, the UCC3817PW uniquely combines 16-V UVLO for high-line reliability, programmable 6–220-kHz operation, and a buffered 7.5-V reference - making it optimal for universal-input, IEC61000-3-2-compliant power supplies demanding design margin and peripheral integration.
Availability
UCC3817PW is available at Aetrix Electronics and suitable for PC power supplies, industrial AC/DC converters, and LED driver front-ends requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for UCC3817PW 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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and computing power solutions.
The UCC3817PW belongs to TI's BiCMOS PFC controller product line, designed specifically for cost-effective, high-efficiency active power factor correction in sub-300-W universal-input AC/DC power supplies compliant with IEC61000-3-2.
FAQ
What is the operating temperature range for the UCC3817PW?
The UCC3817PW is specified for operation from 0°C to +70°C ambient temperature. This differs from the UCC2817PW, which supports −40°C to +85°C. The UCC3817PW's electrical characteristics - including VREF accuracy, UVLO thresholds, and oscillator stability - are guaranteed only within this 0°C–70°C range, as confirmed in Section 6.3 of the SLUS395K datasheet.
Does the UCC3817PW provide a usable voltage reference for external circuitry?
Yes, the UCC3817PW provides a buffered 7.5-V reference at Pin 9 (VREF) with ±0.113-V accuracy over 0°C–70°C and load capability up to 20 mA. It is internally short-circuit current-limited and disabled when VCC falls below UVLO. This eliminates the need for an external reference in most PFC designs, as verified in Sections 6.5 and 7.3.1 of the datasheet.
How does the UCC3817PW implement overvoltage protection?
The UCC3817PW uses its OVP/EN pin (Pin 10) as a window comparator. When the sensed boost voltage exceeds VREF + 0.50 V (≈8.0 V), the controller disables DRVOUT. Hysteresis is 500 mV, ensuring clean recovery. If OVP/EN is pulled below 1.9 V, both DRVOUT and soft-start are reset - a behavior confirmed in Section 6.5 and Figure 7-3 of the SLUS395K datasheet.
Can the UCC3817PW be used in discontinuous conduction mode (DCM)?
No - the UCC3817PW is designed exclusively for continuous conduction mode (CCM) boost PFC operation using average current-mode control. Its internal architecture, including the multiplier transfer function and current amplifier bandwidth, assumes CCM operation. Transition mode (CRM) or DCM use is unsupported and not characterized, as stated in Section 7.4.1 of the datasheet.
What is the purpose of the VFF pin on the UCC3817PW?
VFF (Pin 8) delivers a feed-forward RMS voltage signal derived from half the IAC current. At low line (85 Vac), VFF ≈1.4 V; at high line (265 Vac), it reaches ≈4.7 V. This signal scales the analog multiplier gain to maintain constant power across universal input ranges - a core mechanism for achieving IEC61000-3-2 compliance, detailed in Section 7.3.4 and Equation 3 of SLUS395K.
UCC3817PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
UCC3817PW FAQ
1.How can I place an order for UCC3817PW through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3817PW 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 UCC3817PW reliable?
The price and inventory of UCC3817PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3817PW is usually 5 days.
3.What payment methods are accepted for UCC3817PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3817PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3817PW?
UCC3817PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3817PW 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 UCC3817PW?
For technical support, including UCC3817PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3817PW requirements.
6.How does Aetrix verify that UCC3817PW is sourced from the original manufacturer or authorized distributors?
All UCC3817PW 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 UCC3817PW meets industry standards.
7.What is the process for return or replacement of UCC3817PW?
All UCC3817PW units undergo pre-shipment inspection (PSI). If there is an issue with UCC3817PW, 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 UCC3817PW part is unused and in its original packaging.
Return procedure for UCC3817PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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