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Texas Instruments UC3854BNG4
- Part No.:
- UC3854BNG4
- Manufacturer:
- Texas Instruments
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3854BNG4.pdf
- Description:
- IC PFC CTR AV CURR 200KHZ 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,230
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Product details
Overview
UC3854BNG4 from Texas Instruments is a fixed-frequency average current-mode power factor correction (PFC) controller IC designed for boost preregulator topologies. It features a 5 MHz current amplifier, 7.5 V reference, 10.5 V/10 V UVLO threshold, and integrated multiplier with 0 V–5 V VRMS input range. It enables near-unity power factor in AC-DC front-ends for industrial power supplies and LED drivers.
For engineers reviewing the UC3854BNG4 datasheet, UC3854BNG4 pinout, UC3854BNG4 application, or UC3854BNG4 equivalent, key selection considerations include its average current-mode control architecture, 16-pin PDIP package, 0°C to 70°C operating temperature, and compatibility with offline universal-input (85–270 VAC) PFC stages requiring <3% line current distortion.
Technical Context
The UC3854BNG4 implements average current-mode control using a high-bandwidth (5 MHz) current amplifier and a precision analog multiplier that accepts IAC (line voltage proportional current), VRMS (RMS-sensed voltage), and VAO (voltage error amplifier output) to generate the current command signal MOUT. Its multiplier gain constant is –1.0 A/A (typical) with improved linearity and 500 mV VAC offset eliminating external zero-crossing compensation.
It integrates a 7.5 V reference with ±15 mV accuracy, soft-start via SS pin (14 µA charge current), and a 1.5 A peak gate driver (GTDRV) with 35 ns rise/fall times. The UVLO turn-on/turn-off thresholds are 10.5 V / 10 V, optimized for startup from auxiliary 12 V supplies, and the device includes VREF GOOD monitoring to prevent false PWM activation before reference stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC UVLO Turn-on/Off | 10.5 V / 10 V - Enables reliable startup from 12 V auxiliary rails without external bias sequencing. |
| Current Amplifier GBW | 5 MHz - Supports low-distortion current shaping at 400 Hz avionics inputs and fast transient recovery. |
| Reference Voltage | 7.5 V ±15 mV - Provides stable, low-drift feedback reference for voltage loop stability and ripple rejection. |
| VRMS Input Range | 0 V to 5 V - Accommodates full-scale RMS sensing from 85 VAC to 270 VAC with no external scaling adjustment. |
| GTDRV Peak Output | 1.5 A - Drives MOSFET gates directly in boost PFC stages up to 3 kW without external buffers. |
| IAC Input Offset | 500 mV - Eliminates need for external resistor from IAC to VREF used in legacy UC3854 designs. |
| Soft-Start Charge | 14 µA - Enables precise, capacitor-controlled ramp-up of duty cycle to limit inrush current during startup. |
Pinout & Package
UC3854BNG4 is housed in a 16-pin plastic dual in-line package (PDIP-N), RoHS-compliant with NIPDAU lead finish, rated for 0°C to 70°C operation, and supplied in tube packaging (25 units).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power and signal reference ground | Common return for all internal amplifiers, oscillator, and gate driver; requires short, low-inductance PCB connection. |
| PKLMT (Pin 2) | Peak current limit threshold input | Accepts negative voltage from current-sense resistor; sets instantaneous MOSFET conduction limit to prevent overcurrent. |
| CAO (Pin 3) | Current amplifier output | Drives PWM comparator; swings 0.1–7.5 V to command duty cycle based on sensed inductor current error. |
| ISENSE (Pin 4) | Inverting current sense input | Connects to low-side current-sense resistor; operates down to –0.5 V to support bidirectional or negative-offset sensing. |
| MOUT (Pin 5) | Multiplier output / current amp non-inverting input | High-impedance node combining line-voltage feedforward and voltage-loop command; supports differential current sensing. |
| IAC (Pin 6) | Line voltage proportional current input | Accepts current scaled from rectified AC line; internally regulated to 500 mV for zero-crossing accuracy. |
| VAO (Pin 7) | Voltage amplifier output | Clamped to 6.0 V internally; eliminates external zener clamp required in UC3854 designs. |
| VRMS (Pin 8) | RMS voltage feedforward input | Accepts 0–5 V DC representing input RMS voltage; enables line-voltage feedforward for constant power regulation. |
| VREF (Pin 9) | 7.5 V precision reference output | Stable, low-noise reference for external circuits and internal comparators; must be present for device operation. |
| ENA (Pin 10) | Enable input with hysteresis | Activates device above 2.55 V (typ); 600 mV hysteresis prevents chatter during marginal supply conditions. |
| VSENSE (Pin 11) | Voltage feedback input | Connects to output voltage divider; forms error signal for voltage amplifier to regulate DC bus voltage. |
| RSET (Pin 12) | Oscillator charging current set | Resistor to GND programs oscillator frequency independently of multiplier current limiting function. |
| SS (Pin 13) | Soft-start timing capacitor node | Internally charged at 14 µA; controls ramp rate of voltage amplifier reference to limit inrush current. |
| CT (Pin 14) | Oscillator timing capacitor | Capacitor to GND sets switching frequency; typical 1.5 nF yields ~100 kHz with RSET = 8.2 kΩ. |
| VCC (Pin 15) | Positive supply input | Operates from 10–20 V; clamped at 22 V internally; supports current-fed startup configurations. |
| GTDRV (Pin 16) | Gate driver output | 1.5 A peak totem-pole output; requires ≥5 Ω series gate resistor to suppress ringing when driving MOSFET gates. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates slope compensation requirement and enables stable, low-distortion sinusoidal line current without subharmonic oscillation. |
| Integrated 5 MHz current amplifier | Reduces current-sense noise sensitivity and improves transient response in high-frequency PFC applications including 400 Hz avionics. |
| 0 V–5 V VRMS input range | Supports direct connection of standard resistive dividers across full universal AC input range without attenuation or level-shifting. |
| Internal 6.0 V VAO clamp | Removes need for external zener diode clamp, reducing BOM count and improving reliability in high-volume power supply designs. |
| VREF GOOD comparator | Prevents GTDRV activation until 7.5 V reference is stable, eliminating risk of uncontrolled MOSFET turn-on during power-up. |
| 10.5 V/10 V UVLO option | Enables direct operation from 12 V auxiliary supplies-ideal for systems with standby rail or multi-rail power architectures. |
Applications
| Industrial AC-DC Power Supplies | LED Driver Front-Ends |
|---|---|
Use Scenario: 1–3 kW industrial switch-mode power supplies requiring EN61000-3-2 Class C compliance. IC Role / Device Role / Timing Role: Primary PFC controller implementing average current-mode boost regulation with line-voltage feedforward. Use Value: Achieves <3% THD line current distortion across 85–270 VAC input, enabling single-stage PFC without additional filtering. | Use Scenario: High-bay LED luminaires with universal AC input and high-efficiency constant-current output. IC Role / Device Role / Timing Role: Boost PFC stage controller preceding LLC or buck-boost DC-DC converter. Use Value: Maintains >0.99 power factor across full dimming range while supporting 0–10 V or DALI dimming interfaces. |
| Medical Equipment Power Modules | Server PSU Front-Ends |
Use Scenario: UL60601-1 compliant medical AC-DC modules requiring low EMI and high reliability. IC Role / Device Role / Timing Role: Active PFC controller in isolated front-end stage with reinforced insulation barrier. Use Value: Delivers stable 380–400 VDC bus with <2% output voltage ripple under dynamic load steps up to 50%. | Use Scenario: 80 PLUS Titanium-certified server PSUs with digital control and telemetry. IC Role / Device Role / Timing Role: Analog PFC controller providing robust, low-latency current regulation independent of digital management IC. Use Value: Enables seamless handoff between PFC and downstream DC-DC converters during brownout events via foldback power limiting. |
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 |
|---|---|---|---|
| UC3854BDW | SOIC-16 package; same electrical specs and pinout; RoHS-compliant NIPDAU finish; 0°C to 70°C rating. | Suitable for surface-mount production; requires reflow-compatible PCB layout and thermal relief for GND pin. | Select UC3854BDW for automated assembly; UC3854BNG4 remains optimal for through-hole prototyping or legacy board upgrades. |
| L6562ATDTR | Fixed-frequency average current-mode PFC controller; 16-pin SOIC; 12.5 V/7.5 V UVLO; 6.5 V reference; 2.5 A gate drive. | Higher gate drive current and lower UVLO enable operation with smaller startup networks; different pin assignment for CT/SS/RSET. | Choose L6562ATDTR when higher drive strength or tighter UVLO hysteresis is needed; verify PCB layout compatibility due to non-pin-compatible pinout. |
Compared with UC3854BDW, UC3854BNG4 offers identical functionality in through-hole form for manual assembly or repair, while L6562ATDTR provides enhanced gate drive and alternate UVLO but requires board redesign due to incompatible pin mapping and different multiplier interface behavior.
Availability
UC3854BNG4 is available at Aetrix Electronics and suitable for industrial power supplies, LED driver front-ends, and medical equipment power modules requiring stable component supply and long-term design continuity.
Supply support for UC3854BNG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The UC3854BNG4 belongs to TI's legacy power factor correction controller product line, engineered specifically for high-efficiency, low-distortion boost preregulators in universal-input AC-DC conversion systems.
FAQ
What is the operating temperature range of the UC3854BNG4?
The UC3854BNG4 is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade specification aligns with its PDIP package construction and intended use in enclosed power supply environments where airflow and heatsinking are controlled. It is not qualified for extended industrial (–40°C to 85°C) or military (–55°C to 125°C) temperature ranges.
Does the UC3854BNG4 require external slope compensation?
No, the UC3854BNG4 does not require external slope compensation because it uses average current-mode control instead of peak current-mode control. Its internal current amplifier continuously compares sensed inductor current against the commanded waveform, inherently stabilizing the control loop and eliminating subharmonic oscillation across all duty cycles and line conditions.
How does the UC3854BNG4 handle brownout conditions?
The UC3854BNG4 handles brownout conditions via foldback power limiting: when input voltage drops, the multiplier output current is clamped to 2 × IAC, reducing commanded current and preventing overload. Combined with its 10.5 V/10 V UVLO, the device sustains regulation down to minimum VCC while maintaining safe MOSFET conduction limits without external intervention.
Can the UC3854BNG4 replace the original UC3854 in existing designs?
Yes, the UC3854BNG4 is pin compatible with the UC3854 and offers functional enhancements including improved current amplifier bandwidth, lower IAC offset (500 mV vs. 6 V), internal VAO clamp, and VREF GOOD monitoring. Most UC3854 designs can be upgraded by replacing the IC and removing the external IAC-to-VREF resistor and VAO zener clamp.
What is the purpose of the PKLMT pin on the UC3854BNG4?
The PKLMT pin on the UC3854BNG4 serves as the peak current limit threshold input. It accepts a negative voltage derived from the low-side current-sense resistor and compares it against an internal 0 V reference. When the sensed voltage crosses this threshold, the device terminates the current pulse to protect the MOSFET and inductor from overcurrent stress during transients or short-circuits.
UC3854BNG4 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:
- 200kHz
- Current - Startup:
- 250 µA
- Voltage - Supply:
- 10V ~ 20V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC3854BNG4 FAQ
1.How can I place an order for UC3854BNG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3854BNG4 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 UC3854BNG4 reliable?
The price and inventory of UC3854BNG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3854BNG4 is usually 5 days.
3.What payment methods are accepted for UC3854BNG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3854BNG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3854BNG4?
UC3854BNG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3854BNG4 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 UC3854BNG4?
For technical support, including UC3854BNG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3854BNG4 requirements.
6.How does Aetrix verify that UC3854BNG4 is sourced from the original manufacturer or authorized distributors?
All UC3854BNG4 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 UC3854BNG4 meets industry standards.
7.What is the process for return or replacement of UC3854BNG4?
All UC3854BNG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3854BNG4, 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 UC3854BNG4 part is unused and in its original packaging.
Return procedure for UC3854BNG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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