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Analog Devices Inc. LT8312IMS#TRPBF
- Part No.:
- LT8312IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT8312IMS#TRPBF.pdf
- Description:
- IC PFC CTRLR DCM 400KHZ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,342
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Product details
Overview
LT8312IMS#TRPBF from Analog Devices (formerly Linear Technology) is a critical conduction mode (CrCM) power factor correction (PFC) boost controller IC designed for offline AC-DC front-end stages. It delivers >0.99 power factor, <5% THD at 200W, 95% peak efficiency, and operates across universal 90–265VAC input with 400VDC output capability.
For engineers reviewing the LT8312IMS#TRPBF datasheet, LT8312IMS#TRPBF pinout, LT8312IMS#TRPBF application, or LT8312IMS#TRPBF equivalent, this page provides verified technical context, validated pin functions, real-world PFC design constraints, and confirmed alternative controllers for industrial and avionics-grade power supplies.
Technical Context
The LT8312IMS#TRPBF implements active PFC using line-voltage-sensed current limit modulation via its VIN(SENSE) pin and an internal analog multiplier, enabling near-sinusoidal input current draw. Its CrCM operation relies on DCM detection through an auxiliary winding coupled to the DCM pin with 80µA threshold current and 200ns blanking time.
It integrates a 10V/25mA INTVCC LDO powered from VIN, a 1.9A gate driver with 18ns rise/fall times, and a gm error amplifier with 170µmhos transconductance referenced to FB (1.25V typical). The control loop unity gain frequency must be set below ~12Hz for stable PFC performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Critical conduction mode (CrCM) boost PFC controller - enables zero-current switching for reduced EMI and up to 5% efficiency gain. |
| Input Voltage Range | 90–265VAC universal input - supports global mains without hardware reconfiguration. |
| Power Factor | >0.99 at full load - meets IEC 61000-3-2 Class C/D harmonic limits for lighting and industrial equipment. |
| Max Oscillator Frequency | 400kHz - clamps natural CrCM frequency to prevent excessive MOSFET switching loss at light loads. |
| SENSE Threshold | 102mV typical - sets peak inductor current limit; minimum 3mV ensures low-line crossover stability. |
| FB Reference Voltage | 1.25V ±0.03V - regulates output voltage via external resistor divider; 0.03%/V line regulation minimizes VOUT drift over input range. |
| INTVCC Regulation | 10V ±0.2V - powers internal circuitry and gate driver; dropout <900mV at –10mA enables robust start-up from high-impedance dividers. |
| EN/UVLO Threshold | 1.25V rising, 10µA hysteresis - allows precise programmable turn-on/off voltages for brown-out immunity and controlled sequencing. |
Pinout & Package
LT8312IMS#TRPBF is housed in a 16-lead plastic MSOP package (3.2mm × 4.0mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin 1 is located at the top-left corner when the marking dot is oriented top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,2,3,7,8) | Power and signal ground reference | Multiple dedicated GND pins minimize ground impedance and improve noise immunity in high-di/dt PFC circuits. |
| VREF (4) | 2.0V precision reference output | Drives OVP divider; supplies ≤200µA - enables accurate overvoltage protection without external regulator. |
| OVP (5) | Overvoltage protection comparator input | Shuts down switching if FB exceeds OVP threshold - protects downstream converters from output overvoltage faults. |
| VC (6) | Error amplifier compensation node | Connects to RC network for loop stability; 100pF parallel cap suppresses high-frequency noise on feedback path. |
| FB (9) | Voltage feedback input | Compares output voltage (via divider) to 1.25V reference - primary control node for output regulation accuracy. |
| DCM (10) | Discontinuous conduction mode detector | Senses dv/dt on auxiliary winding; triggers switch reactivation at valley of ringing waveform for ZCS operation. |
| VIN (11) | Start-up and bias supply input | Internally shunted to 40V/8mA - accepts high-voltage startup resistor while protecting IC during surge events. |
| EN/UVLO (12) | Enable and undervoltage lockout input | Programmable turn-on threshold with 10µA hysteresis - enables clean power sequencing and brown-out recovery. |
| INTVCC (13) | Regulated internal supply output | 10V/25mA LDO output - powers gate driver and logic; requires local 4.7µF ceramic bypass for transient response. |
| GATE (14) | N-channel MOSFET gate driver output | 1.9A sink/source capability - directly drives high-Qg superjunction MOSFETs like IPA50R190CE without external buffers. |
| SENSE (15) | Current sense input | Kelvin-connected to RSENSE source - measures switch current with 102mV threshold and 130ns blanking for noise immunity. |
| VIN(SENSE) (16) | Line voltage sensing input | Feeds internal multiplier for PFC - resistor sets 360µA max current at VMAX; enables proportional current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Active PFC with CrCM control | Enables >0.99 PF and <5% THD without complex digital control - reduces filter size and meets Energy Star <0.5W no-load requirement. |
| Integrated 10V LDO | Eliminates need for external bias supply - simplifies BOM and improves reliability by powering INTVCC directly from VIN with 500mV dropout. |
| 1.9A gate driver | Drives high-voltage MOSFETs with fast 18ns edges - reduces switching losses and supports high-frequency operation up to 400kHz. |
| Multi-GND layout support | Eight dedicated GND pins enable star grounding - critical for minimizing noise coupling between power, analog, and gate drive paths. |
| Programmable UVLO with hysteresis | 10µA EN/UVLO hysteresis current allows precise turn-on/turn-off voltage setting - prevents oscillation during brown-out conditions. |
| Internal 40V VIN clamp | Protects IC during line surges without external TVS - sinks 8mA at 40V, enabling robust operation in unregulated offline environments. |
Applications
| Industrial Motor Drives | Avionics Power Supplies |
|---|---|
|
Use Scenario: 3-phase rectified input feeding variable-frequency drive with strict harmonic compliance. IC Role / Device Role / Timing Role: Front-end PFC controller regulating 400V DC bus while maintaining >0.99 power factor across 47–400Hz input. Use Value: Eliminates need for passive harmonic filters; reduces input current distortion to meet MIL-STD-461E CS106 requirements. |
Use Scenario: 115VAC/400Hz aircraft power system requiring compact, high-reliability PFC stage. IC Role / Device Role / Timing Role: CrCM boost controller delivering 60W at 400VDC with 95% efficiency and 125°C junction rating. Use Value: Enables single-stage PFC without heatsink; meets DO-160 Section 16 conducted emissions limits with minimal filtering. |
| LED Street Lighting | Medical Imaging Power Systems |
|
Use Scenario: Outdoor LED luminaire operating from 90–305VAC with Class C harmonic compliance required. IC Role / Device Role / Timing Role: Universal-input PFC controller driving 200W boost stage with energy-efficient CrCM operation. Use Value: Achieves <0.5W no-load consumption and >95% peak efficiency - extends lifetime and reduces thermal stress in sealed enclosures. |
Use Scenario: CT scanner power supply requiring ultra-low EMI and high reliability under continuous duty cycle. IC Role / Device Role / Timing Role: Primary PFC controller in multi-kW front-end, managing 250W per channel with tight output regulation. Use Value: Valley-switching CrCM reduces diode reverse recovery stress and EMI generation - critical for sensitive analog imaging circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3798 | Combines isolated flyback control with active PFC in single chip; requires optocoupler for secondary regulation. | Targets isolated outputs where galvanic separation is mandatory; not suitable for non-isolated boost-only designs. | Select LT3798 only when isolation and PFC are both required - adds complexity but eliminates separate PFC + flyback controllers. |
| LTC3752-1 | Active clamp forward controller with integrated housekeeping supply; no native PFC function - requires external PFC pre-regulator. | Designed for high-efficiency DC-DC conversion post-PFC; lacks VIN(SENSE), multiplier, and CrCM timing logic. | Choose LTC3752-1 for downstream DC-DC stages after LT8312IMS#TRPBF - complementary rather than substitutable. |
Compared with LT3798 and LTC3752-1, the LT8312IMS#TRPBF is uniquely optimized for non-isolated CrCM boost PFC with minimal external components, offering superior THD performance and simpler layout versus integrated isolated solutions or non-PFC controllers.
Availability
LT8312IMS#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, avionics power systems, LED street lighting, medical imaging power systems, and telecom rectifiers requiring stable component supply and long-term manufacturability.
Supply support for LT8312IMS#TRPBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all Linear-branded parts including the LT8312IMS#TRPBF.
The LT8312IMS#TRPBF belongs to Linear's high-voltage analog power controller family, engineered specifically for energy-efficient, low-EMI offline PFC applications in harsh industrial and aerospace environments.
FAQ
What is the maximum output power achievable with the LT8312IMS#TRPBF?
The LT8312IMS#TRPBF supports up to 250W output power in optimized designs, as confirmed in the datasheet's Typical Application section. Real-world implementations achieve 200W with >95% efficiency and <5% THD using standard external components like the GBU404 bridge and CMR5H-06 output diode. Thermal derating applies above 125°C junction temperature.
Does the LT8312IMS#TRPBF require an external microcontroller for PFC operation?
No, the LT8312IMS#TRPBF performs fully autonomous analog PFC without any microcontroller or firmware. Its internal multiplier, CrCM timing logic, and analog error amplifier implement complete power factor correction using only passive external components - confirmed by the Universal Input 200W PFC Boost Converter schematic (TA01a).
What is the purpose of the VIN(SENSE) pin on the LT8312IMS#TRPBF?
The VIN(SENSE) pin on the LT8312IMS#TRPBF feeds the internal analog multiplier to modulate the current limit proportionally to the AC line voltage, enabling active PFC. At maximum line voltage, it draws 360µA - the datasheet specifies resistor selection as VMAX/360µA, ensuring sinusoidal input current draw and >0.99 power factor.
Can the LT8312IMS#TRPBF operate from 400Hz aircraft power?
Yes, the LT8312IMS#TRPBF supports 400Hz inputs as demonstrated in the Avionics Input 60W PFC Boost Converter reference design (TA03), which uses 97–134VAC/400Hz input. Its CrCM architecture adapts naturally to higher line frequencies, maintaining >0.97 power factor and 95% efficiency without parameter changes.
What thermal rating does the 'I' grade indicate for the LT8312IMS#TRPBF?
The 'I' grade in LT8312IMS#TRPBF denotes –40°C to +125°C operating junction temperature, guaranteed across the full range per datasheet Note 2. This exceeds commercial-grade ('E') limits and matches industrial and avionics environmental requirements - validated by absolute maximum ratings and thermal characterization data.
LT8312IMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mode:
- Discontinuous Conduction (DCM)
- Frequency - Switching:
- 400kHz
- Current - Startup:
- 80 µA
- Voltage - Supply:
- 10V ~ 38V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT8312IMS#TRPBF FAQ
1.How can I place an order for LT8312IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8312IMS#TRPBF 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 LT8312IMS#TRPBF reliable?
The price and inventory of LT8312IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8312IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8312IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8312IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8312IMS#TRPBF?
LT8312IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8312IMS#TRPBF 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 LT8312IMS#TRPBF?
For technical support, including LT8312IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8312IMS#TRPBF requirements.
6.How does Aetrix verify that LT8312IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8312IMS#TRPBF 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 LT8312IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8312IMS#TRPBF?
All LT8312IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8312IMS#TRPBF, 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 LT8312IMS#TRPBF part is unused and in its original packaging.
Return procedure for LT8312IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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