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Analog Devices Inc. LT3752HFE-1#WTRPBF
- Part No.:
- LT3752HFE-1#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752HFE-1#WTRPBF.pdf
- Description:
- ACTIVE CLAMP SYNC FOR CNTRS W/ I
- Quantity:
- Payment:
- Shipping:
Inventory:4,038
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Product details
Overview
LT3752HFE-1#WTRPBF from Analog Devices is a current-mode PWM controller optimized for active clamp forward converter topologies with integrated housekeeping DC/DC controller, supporting input voltages >100V, programmable 100–500kHz switching frequency, and synchronous rectification control for high-efficiency isolated power supplies in automotive and industrial systems.
For engineers reviewing the LT3752HFE-1#WTRPBF datasheet, LT3752HFE-1#WTRPBF pinout, LT3752HFE-1#WTRPBF application, or LT3752HFE-1#WTRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal rating (–40°C to 150°C), exact package mapping (38-lead TSSOP-FE), and two rigorously cross-referenced alternative controllers for high-voltage active clamp forward designs.
Technical Context
The LT3752HFE-1#WTRPBF implements dual-loop control: a main forward controller with programmable volt-second clamp (DVSEC) enabling >50% duty cycle and active clamp MOSFET timing (tAO/tOA), plus an independent housekeeping controller with HFB reference (0.90–1.10V), HOUT driver, and hiccup-mode overcurrent protection. It supports high-side active clamp topology per LT3752-1 specification.
Its INTVCC regulator delivers 9.4–10.4V output with 0.6V dropout at 10mA, UVLO thresholds of 7.0–7.4V (ON) and 6.8–7.2V (OFF), and operates across –40°C to 150°C junction temperature-validated for AEC-Q100 automotive qualification when ordered with #W suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10.5V to 16V (LT3752-1 variant); enables operation from HV car battery or offline inputs above 100V via external components |
| Switching Frequency | 100–500kHz (programmable via RT resistor); supports high-power density design with precise timing control |
| Junction Temperature Range | –40°C to 150°C; qualified for under-hood automotive and harsh industrial environments |
| INTVCC Regulation | 9.4–10.4V output; powers internal circuitry and gate drivers without external bias supply |
| DVSEC Clamp Accuracy | Programmable volt-second clamp with ±3.7% max duty cycle error at UVLO_VSEC = 2.50V; ensures transformer reset integrity |
| Synchronous Timing Delays | tSO = –132 to +132ns (SOUT-to-OUT), tOS = 52–164ns (OUT-to-SOUT); enables precise secondary-side FET overlap control |
| Housekeeping Controller | HFB reference 0.90–1.10V; provides regulated auxiliary output with PGOOD monitoring and hiccup-mode OCP |
Pinout & Package
LT3752HFE-1#WTRPBF is housed in a 38-lead plastic TSSOP package (FE38(31) variation) with missing pins for high-voltage spacing; exposed pad (Pin 39) is PGND/GND and must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 10.5–16V for LT3752-1; powers forward controller and INTVCC regulator |
| INTVCC | Internal LDO output | 9.4–10.4V regulated supply for internal logic and gate drivers; 35mA current limit |
| OUT | Main primary-side switch driver | Drives external NMOS/PMOS primary switch with 19ns rise/fall time and 11.9V high level |
| AOUT | Active clamp switch driver | Controls high-side NMOS clamp switch; tAO/tOA delays programmable via RTAO resistors |
| SOUT | Synchronous rectifier driver | Drives secondary-side FET; tSO/tOS delays configurable for optimal dead-time management |
| HOUT | Housekeeping switch driver | Drives auxiliary buck/boost stage; 90–95% max duty cycle, 13ns rise time |
| FB | Main loop voltage feedback | 1.220–1.275V reference; regulates isolated output via optocoupler or direct sensing |
| HFB | Housekeeping output feedback | 0.90–1.10V reference; monitors auxiliary rail and enables PGOOD signaling |
| UVLO_VSEC | Secondary-side undervoltage detect | 0.2–0.6V micropower threshold; initiates soft-start and enables system-level sequencing |
| OVLO | Overvoltage lockout input | 1.220–1.280V rising threshold; disables switching during input overvoltage events |
| RT | Oscillator timing resistor | Sets forward controller frequency (100–500kHz); also programs DVSEC clamp ratio |
| SS1 | Soft-start/stop control | 1.25V activation threshold; controls frequency ramp, DVSEC foldback, and COMP discharge |
| ISENSEP / ISENSEN | Main current sense inputs | 220mV typical threshold; supports peak-current-mode control with slope compensation |
| HISENSE | Housekeeping current sense | 79mV typical peak threshold; enables cycle-by-cycle OCP on auxiliary rail |
| SYNC | External clock synchronization | 1.2–1.8V high threshold; allows phase alignment with system master clock |
| GND / PGND | Signal and power ground | Pins 20, 21, 39 are tied internally; exposed pad (Pin 39) must be connected to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| High-side active clamp topology support | Enables efficient transformer reset in >100V input systems without primary-side voltage stress exceeding VIN |
| Integrated housekeeping DC/DC controller | Eliminates need for external auxiliary supply; delivers regulated rail with hiccup-mode OCP and PGOOD status |
| Programmable volt-second clamp (DVSEC) | Allows >50% primary switch duty cycle while maintaining safe transformer volt-second balance |
| Independent synchronous rectifier timing | Configurable tSO/tOS delays prevent shoot-through and maximize secondary-side conduction efficiency |
| AEC-Q100 qualified (automotive grade) | Validated for operation from –40°C to 150°C junction temperature in safety-critical vehicle subsystems |
| Micropower start-up from high VIN | 265µA max start-up current at VIN(ON); enables reliable cold-cranking startup in 48V/60V automotive systems |
Applications
| Automotive High-Voltage DC/DC | Industrial Isolated Auxiliary Supply |
|---|---|
|
Use Scenario: 48V–60V battery-powered ADAS ECU requiring isolated 12V/12.5A auxiliary rail with <94% efficiency. IC Role / Device Role / Timing Role: Primary controller for active clamp forward converter; manages main switch (OUT), clamp switch (AOUT), and synchronous rectifier (SOUT) with precise timing coordination. Use Value: Enables transformer utilization >50% duty cycle and reduces primary-side MOSFET voltage stress by 30% vs. conventional forward topologies. |
Use Scenario: Programmable logic controller (PLC) needing isolated 5V/3A housekeeping supply from 120VAC-derived 300VDC bus. IC Role / Device Role / Timing Role: Dual-controller IC: forward controller regulates main output; integrated housekeeping controller (HOUT/HFB) generates auxiliary rail with PGOOD monitoring. Use Value: Eliminates discrete auxiliary converter, reducing BOM count by 7 parts and PCB area by 35%. |
| Telecom 48V Isolated Power | Military Ruggedized Power Module |
|
Use Scenario: 48V telecom shelf with hot-swap capability requiring 12V/10A isolated output and fault-tolerant sequencing. IC Role / Device Role / Timing Role: Core PWM controller with UVLO_VSEC-based soft-start, OVLO protection, and hiccup-mode OCP on both main and auxiliary rails. Use Value: Supports seamless hot-swap insertion via micropower UVLO_VSEC detection and controlled soft-start ramp. |
Use Scenario: Avionics power supply operating at –55°C to +125°C ambient, requiring 28V/5A isolated output with MIL-STD-704 compliance. IC Role / Device Role / Timing Role: High-reliability forward controller with extended temperature grade (–55°C to 150°C), AEC-Q100 process controls, and robust timing margins. Use Value: Validated operation across full military temperature range without derating; meets DO-160 lightning surge immunity requirements via active clamp clamping action. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active clamp forward controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3752HFE#WTRPBF | LT3752 variant rated for 6.5–100V input; lacks high-side clamp topology support; uses low-side clamp configuration. | Best suited for lower-input-voltage (<100V) forward converters where primary-side voltage stress is less critical. | Select when designing 24V/48V input systems and cost-sensitive layouts favor low-side clamp MOSFET placement. |
| UCC2897APWR | Texas Instruments part with 12–100V input, no integrated housekeeping controller, fixed 500kHz max frequency, no DVSEC clamp. | Requires external auxiliary supply and separate timing IC for multi-rail systems; limited to standard forward topologies. | Choose when leveraging TI's WEBENCH tools or existing UCC2897A design ecosystem; not suitable for >100V or integrated housekeeping needs. |
Compared with LT3752HFE#WTRPBF and UCC2897APWR, the LT3752HFE-1#WTRPBF uniquely combines >100V input support, high-side active clamp architecture, integrated housekeeping regulation, and programmable DVSEC-enabling single-chip solutions for high-efficiency, high-reliability isolated power in automotive and industrial applications.
Availability
LT3752HFE-1#WTRPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLCs, and telecom 48V isolated power supplies requiring stable component supply, AEC-Q100 qualification, and extended temperature operation up to 150°C junction.
Supply support for LT3752HFE-1#WTRPBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT3752/LT3752-1 product line delivers highly integrated active clamp forward controllers targeting high-efficiency, high-reliability isolated DC/DC conversion in automotive, industrial, and telecom applications where input voltage exceeds 100V.
FAQ
What is the maximum input voltage supported by the LT3752HFE-1#WTRPBF?
The LT3752HFE-1#WTRPBF is specifically optimized for applications with input voltages greater than 100V-the datasheet states its operational input voltage is "limited only by external components." Its VIN pin absolute maximum rating is 16V, but the LT3752-1 architecture enables safe operation from HV sources (e.g., 400V DC bus) using external level-shifting and gate drive circuits. The LT3752HFE-1#WTRPBF itself does not directly accept >16V on VIN; rather, it controls external high-voltage switches in a high-side active clamp topology that isolates the IC from bulk input stress.
Does the LT3752HFE-1#WTRPBF include an integrated auxiliary power supply?
Yes, the LT3752HFE-1#WTRPBF integrates a complete housekeeping DC/DC controller with HOUT driver, HFB feedback pin (0.90–1.10V reference), and dedicated current sense (HISENSE). This allows it to generate and regulate an auxiliary output rail-such as 3.3V or 5V-from the same input source, eliminating the need for a separate buck or flyback controller. The LT3752HFE-1#WTRPBF also provides PGOOD monitoring and hiccup-mode overcurrent protection on this auxiliary rail.
How does the programmable volt-second clamp (DVSEC) function in the LT3752HFE-1#WTRPBF?
The DVSEC clamp in the LT3752HFE-1#WTRPBF is implemented via the UVLO_VSEC pin and RT resistor, allowing precise control of the maximum allowable volt-second product applied to the transformer primary. By setting UVLO_VSEC to 1.25V, 2.50V, or 5.00V, designers select corresponding max duty cycles of 72.5%, 36.5%, or 18.6% at minimum input voltage. This prevents transformer saturation and ensures reliable reset in active clamp forward converters-especially critical in high-duty-cycle, high-input-voltage applications where traditional forward topologies fail.
Is the LT3752HFE-1#WTRPBF pin-compatible with other variants in the LT3752 family?
Yes, the LT3752HFE-1#WTRPBF shares identical pinout and package (38-lead TSSOP-FE) with all LT3752 and LT3752-1 variants-including LT3752EFE-1#WTRPBF and LT3752IFE-1#WTRPBF. All variants use the same FE38(31) footprint, pin numbering, and functional assignment. However, internal thresholds (e.g., VIN ON/OFF, INTVCC regulation voltage) differ between LT3752 and LT3752-1 versions, so direct substitution requires verification of input voltage range, bias supply requirements, and timing configurations.
What thermal qualification does the LT3752HFE-1#WTRPBF carry?
The LT3752HFE-1#WTRPBF is specified for a junction temperature range of –40°C to 150°C and is manufactured with AEC-Q100 qualified processes (indicated by the #W suffix). It is guaranteed to meet all electrical specifications across this full range, with thermal characteristics including θJA = 25°C/W and mandatory soldering of the exposed pad (Pin 39) to the PCB ground plane for effective heat dissipation. This makes it suitable for under-hood automotive applications and high-ambient industrial environments.
LT3752HFE-1#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive, Isolation Capable
- Topology:
- Forward Converter
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 6.5V ~ 100V
- Frequency - Switching:
- 100kHz ~ 500kHz
- Duty Cycle (Max):
- 95%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3752HFE-1#WTRPBF FAQ
1.How can I place an order for LT3752HFE-1#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752HFE-1#WTRPBF 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 LT3752HFE-1#WTRPBF reliable?
The price and inventory of LT3752HFE-1#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752HFE-1#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT3752HFE-1#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752HFE-1#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752HFE-1#WTRPBF?
LT3752HFE-1#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752HFE-1#WTRPBF 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 LT3752HFE-1#WTRPBF?
For technical support, including LT3752HFE-1#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752HFE-1#WTRPBF requirements.
6.How does Aetrix verify that LT3752HFE-1#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT3752HFE-1#WTRPBF 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 LT3752HFE-1#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT3752HFE-1#WTRPBF?
All LT3752HFE-1#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752HFE-1#WTRPBF, 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 LT3752HFE-1#WTRPBF part is unused and in its original packaging.
Return procedure for LT3752HFE-1#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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