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Analog Devices Inc. LT8312HMS#TRPBF
- Part No.:
- LT8312HMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT8312HMS#TRPBF.pdf
- Description:
- IC PFC CTRLR DCM 400KHZ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
LT8312HMS#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage power factor correction (PFC) boost controller designed for critical conduction mode (CrCM) operation in offline AC/DC front-end stages. It delivers >0.99 power factor, supports universal 90–265VAC input, achieves >95% efficiency at 200W output, and integrates a 1.9A gate driver with 10V INTVCC LDO - enabling robust PFC stages in industrial and avionics power supplies.
For engineers reviewing the LT8312HMS#TRPBF datasheet, LT8312HMS#TRPBF pinout, LT8312HMS#TRPBF application, or LT8312HMS#TRPBF equivalent, key selection considerations include its –40°C to +150°C extended temperature grade, CrCM frequency clamping up to 400kHz, 1.25V EN/UVLO threshold with 10µA hysteresis, 102mV SENSE current limit threshold, and MSOP-16 package compatibility with thermal derating above 125°C junction temperature.
Technical Context
The LT8312HMS#TRPBF implements active PFC via an internal multiplier that modulates the peak current limit proportionally to line voltage sensed at VIN(SENSE), enabling near-sinusoidal input current draw. Its CrCM control architecture uses DCM detection via auxiliary winding ringing to achieve zero-current switching, reducing switching losses by up to 5%.
It features a gm-type error amplifier (170 µmhos transconductance, 180 V/V gain) referenced to 1.25V FB pin, compensated via VC pin with external RC network, and operates with loop unity-gain bandwidth <12Hz to maintain PFC integrity across 120Hz line harmonics. The integrated 40V/8mA VIN shunt regulator enables micropower hysteretic start-up from high-voltage AC inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10V to 38V DC - sets operating range for DC bus or rectified AC input; higher voltages handled via external components. |
| Power Factor | >0.99 - ensures compliance with IEC 61000-3-2 Class C/D harmonic limits for lighting and industrial equipment. |
| Max Oscillator Frequency | 400 kHz - prevents excessive switching loss at light loads while maintaining CrCM behavior under heavy loads. |
| SENSE Threshold | 102 mV (typ) - defines peak switch current limit; determines RSENSE value for MOSFET overcurrent protection. |
| EN/UVLO Threshold | 1.25 V rising - enables precise turn-on voltage setting via resistor divider; 10 µA hysteresis current ensures stable UVLO release. |
| INTVCC Regulation | 10 V ±0.2 V - powers internal circuitry and 1.9A gate driver; requires local 4.7µF ceramic bypass capacitor. |
| Operating Junction Temp | –40°C to +150°C - validated high-temp performance for avionics and industrial environments; lifetime derated above 125°C. |
Pinout & Package
LT8312HMS#TRPBF is housed in a 16-lead plastic MSOP package (3.20–3.45 mm width, 0.50 mm pitch), optimized for thermal dissipation in high-power PFC applications and compatible with standard surface-mount reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,2,3,7,8) | Ground reference | Multiple low-inductance ground connections reduce noise coupling into sensitive analog blocks (FB, SENSE, VIN_SENSE). |
| VREF (4) | 2.0V reference output | Drives OVP resistor divider; supplies ≤200 µA - enables accurate overvoltage protection without external reference. |
| OVP (5) | Overvoltage protection comparator input | Shuts down switching when FB exceeds VREF-based threshold - protects downstream converters from overvoltage faults. |
| VC (6) | Error amplifier compensation node | Connects external RC network to stabilize feedback loop; 100 pF parallel cap suppresses high-frequency noise. |
| FB (9) | Voltage feedback input | Regulates output voltage via resistor divider; 1.25V threshold enables precise VOUT setting (e.g., 400V with R3/R4 = 319kΩ/11.8kΩ). |
| DCM (10) | Discontinuous conduction mode detector | AC-couples to auxiliary winding; detects dv/dt zero-crossing to enable zero-current turn-on - improves efficiency by ~5%. |
| VIN (11) | Start-up and bias supply input | Internally regulated to 10V INTVCC; includes 40V/8mA shunt clamp - allows direct connection to rectified AC via high-value resistor. |
| EN/UVLO (12) | Enable and undervoltage lockout | Configurable turn-on/off thresholds via resistor divider; 10 µA hysteresis current ensures clean startup without oscillation. |
| INTVCC (13) | Internal regulated supply | 10V output powers gate driver and logic; requires 4.7µF local ceramic capacitor - insufficient bulk causes gate drive dropout. |
| GATE (14) | N-channel MOSFET gate driver | 1.9A sink/source capability drives high-QG MOSFETs; VOL < 0.01V ensures full enhancement of low-RDS(on) devices. |
| SENSE (15) | Current sense input | Kelvin-connected to RSENSE source; 102mV threshold sets peak current - accuracy directly impacts THD and power factor. |
| VIN_SENSE (16) | Line voltage sensing input | Accepts scaled AC line voltage; sets current limit modulation depth - critical for achieving >0.99 PF across universal input range. |
Key Features
| Feature | Design Value |
|---|---|
| Critical Conduction Mode (CrCM) Control | Enables zero-current switching via DCM pin detection - reduces EMI and improves efficiency by minimizing turn-on loss. |
| Integrated 1.9A Gate Driver | Directly drives high-voltage N-channel MOSFETs (e.g., IPA50R190CE) without external buffers - simplifies layout and reduces component count. |
| Active Power Factor Correction | Uses internal multiplier to scale current limit with line voltage - achieves >0.99 PF and meets Energy Star <0.5W no-load requirement. |
| 40V VIN Shunt Regulator | Allows direct high-voltage start-up using single resistor from rectified AC - eliminates need for auxiliary transformer or dedicated start-up IC. |
| –40°C to +150°C Operating Range | Validated high-temperature performance for avionics and industrial applications - enables use in sealed enclosures without forced cooling. |
Applications
| Industrial Motor Drives | Avionics Power Supplies |
|---|---|
|
Use Scenario: 3-phase AC input rectified to 400V DC bus feeding variable-frequency drives in factory automation systems. IC Role / Device Role / Timing Role: PFC boost controller regulating DC bus voltage while enforcing sinusoidal input current per IEC 61000-3-2. Use Value: Enables >95% system efficiency at 200W, reduces harmonic injection into plant distribution network, and avoids utility penalties. |
Use Scenario: 115VAC/400Hz aircraft power feeding 28V DC avionics bus via isolated DC/DC converter. IC Role / Device Role / Timing Role: Front-end PFC stage ensuring stable 400V intermediate bus despite wide input voltage and frequency variation. Use Value: Maintains >0.99 PF across 97–134VAC/360–440Hz range, meets DO-160 Section 18 conducted emissions requirements. |
| LED Street Lighting | Medical Imaging Power Systems |
|
Use Scenario: Outdoor LED luminaires requiring universal 90–265VAC input and Class C harmonic compliance. IC Role / Device Role / Timing Role: Single-stage PFC controller driving boost converter to generate constant-current LED string supply. Use Value: Achieves Energy Star Tier 2 efficiency (>90%) and <0.5W no-load consumption - extends luminaire lifetime and reduces thermal stress. |
Use Scenario: High-reliability X-ray generator power supply needing stable 400V DC bus with low THD and fault tolerance. IC Role / Device Role / Timing Role: Primary PFC controller with OVP shutdown and minimum 3% current limit to manage line crossover distortion. Use Value: Ensures <5% THD at full load and failsafe shutdown on output overvoltage - critical for patient safety and regulatory certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8311IMS#TRPBF | Dedicated synchronous rectifier controller with opto-coupler driver; no integrated PFC control or VIN shunt regulator. | Requires companion PFC controller (e.g., LT3798); used in isolated forward/flyback topologies, not standalone boost PFC. | Select LT8311IMS#TRPBF only when designing isolated secondary-side regulation with primary-side PFC - not a drop-in replacement. |
| UCC28070DWR | Two-phase interleaved CCM PFC controller; fixed 65–300kHz frequency; no CrCM operation or DCM detection pin. | Better suited for >300W applications requiring lower ripple and higher efficiency; incompatible with LT8312HMS#TRPBF's CrCM timing and pinout. | Choose UCC28070DWR for high-power CCM designs where size and ripple matter more than universal input simplicity. |
Compared with LT8312HMS#TRPBF, LT8311IMS#TRPBF lacks PFC functionality entirely and serves a complementary role in isolated topologies, while UCC28070DWR targets higher-power continuous conduction mode with different control architecture and no CrCM zero-current switching benefit.
Availability
LT8312HMS#TRPBF is available at Aetrix Electronics and suitable for industrial motor drives, avionics power supplies, LED street lighting, medical imaging systems, and energy-efficient AC/DC adapters requiring stable component supply across extended temperature ranges.
Supply support for LT8312HMS#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 its legacy precision analog and power management portfolio with rigorous qualification standards.
The LT8312 product line was engineered specifically for high-efficiency, universal-input active PFC in space-constrained industrial and aerospace applications - emphasizing CrCM control, extended temperature reliability, and minimal external component count.
FAQ
What is the maximum operating junction temperature for the LT8312HMS#TRPBF?
The LT8312HMS#TRPBF is specified for operation from –40°C to +150°C junction temperature. This extended grade is validated per manufacturer characterization and statistical process controls, with lifetime derated above 125°C. The LT8312HMS#TRPBF's thermal performance enables deployment in sealed avionics enclosures and high-ambient industrial settings without forced cooling.
How does the LT8312HMS#TRPBF achieve power factor correction without a microcontroller?
The LT8312HMS#TRPBF achieves active PFC through analog circuitry: the VIN_SENSE pin senses scaled line voltage, feeding an internal multiplier that dynamically adjusts the SENSE pin current limit threshold in real time. This forces input current to track input voltage waveform, yielding >0.99 PF. No firmware or digital control loop is required - the LT8312HMS#TRPBF implements this entirely in hardware.
Can the LT8312HMS#TRPBF be used in discontinuous conduction mode (DCM) only?
No - the LT8312HMS#TRPBF operates in critical conduction mode (CrCM), which sits at the boundary between continuous and discontinuous conduction. Its DCM pin detects zero-current crossing via auxiliary winding ringing to trigger each switching cycle. While it leverages DCM detection, the LT8312HMS#TRPBF is not a pure DCM controller; it actively regulates to maintain CrCM for optimal efficiency and THD.
What is the purpose of the 40V shunt regulator on the VIN pin of the LT8312HMS#TRPBF?
The 40V/8mA shunt regulator on the VIN pin of the LT8312HMS#TRPBF enables direct high-voltage start-up from rectified AC mains using a single series resistor. It clamps VIN during startup to protect internal circuitry, allowing the part to bootstrap via the auxiliary winding once switching begins. This eliminates the need for auxiliary transformers or dedicated start-up ICs - a key design simplification in the LT8312HMS#TRPBF.
Is the LT8312HMS#TRPBF pin-compatible with other LT8312 variants like LT8312EMS#TRPBF?
Yes - all LT8312 variants (EMS, IMS, HMS, MPMS) share identical pinout, package (MSOP-16), and electrical functionality. The only difference is operating temperature grade: LT8312HMS#TRPBF is rated for –40°C to +150°C, while LT8312EMS#TRPBF is rated for –40°C to +125°C. Layout and schematic can be reused across grades; thermal design must account for the higher max junction temperature of the LT8312HMS#TRPBF.
LT8312HMS#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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT8312HMS#TRPBF FAQ
1.How can I place an order for LT8312HMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8312HMS#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 LT8312HMS#TRPBF reliable?
The price and inventory of LT8312HMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8312HMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8312HMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8312HMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8312HMS#TRPBF?
LT8312HMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8312HMS#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 LT8312HMS#TRPBF?
For technical support, including LT8312HMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8312HMS#TRPBF requirements.
6.How does Aetrix verify that LT8312HMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8312HMS#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 LT8312HMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8312HMS#TRPBF?
All LT8312HMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8312HMS#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 LT8312HMS#TRPBF part is unused and in its original packaging.
Return procedure for LT8312HMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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