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Analog Devices Inc. LT3752EFE-1#TRPBF
- Part No.:
- LT3752EFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752EFE-1#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,945
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Product details
Overview
LT3752EFE-1#TRPBF 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 via SOUT pin. It enables high-efficiency isolated power supplies in automotive and telecom applications.
For engineers reviewing the LT3752EFE-1#TRPBF datasheet, LT3752EFE-1#TRPBF pinout, LT3752EFE-1#TRPBF application, or LT3752EFE-1#TRPBF equivalent, key selection considerations include its HI-side active clamp topology support, INTVCC regulation at 9.4–10.4V, programmable volt-second clamp (DVSEC), and AEC-Q100 qualification for automotive systems.
Technical Context
The LT3752EFE-1#TRPBF implements dual-loop control: a main forward controller (OUT/AOUT/SOUT) with adaptive leading-edge blanking and programmable timing delays (tAO, tOA, tSO, tOS), and an independent housekeeping controller (HOUT/HCOMP/HFB) operating up to 321kHz with soft-start and hiccup-mode overcurrent protection. Its HI-side active clamp topology (LT3752-1 variant) reduces primary switch voltage stress while enabling duty cycles above 50%.
It features two independent oscillators - one for the forward controller (100–500kHz) and one for the housekeeping controller (55–321kHz) - both programmable via RT resistor and foldback-capable during fault conditions. The device integrates internal regulators for INTVCC (9.4–10.4V) and HFB reference (0.90–1.10V), with dedicated UVLO/OVLO thresholds tailored for high-input-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10.5V to 16V - supports high-input-voltage systems beyond 100V via external components, unlike LT3752 (6.5–100V). |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; line regulation ≤0.1%/V ensures stable operation across input range. |
| INTVCC Regulation | 9.4V to 10.4V - dedicated low-noise linear regulator powers internal circuitry and gate drivers; dropout ≤0.6V at 10mA. |
| Volt-Second Clamp (DVSEC) | Programmable via UVLO_VSEC pin - sets maximum duty cycle based on system input minimum (e.g., 72.5% at UVLO_VSEC = 2.5V, RT = 24.9k). |
| AEC-Q100 Grade | Qualified for automotive applications - operates from –40°C to +125°C junction temperature (E-grade). |
| Gate Driver Outputs | OUT, AOUT (HI-side NMOS clamp), SOUT - all with <25ns rise/fall times (CL = 1nF), 11.9V high-level drive at INTVCC = 12V. |
| Housekeeping Controller | Integrated DC/DC controller with HOUT, HCOMP, HFB pins - provides auxiliary rail with 0.90–1.10V reference, 250µS transconductance, and hiccup-mode OCP. |
Pinout & Package
LT3752EFE-1#TRPBF is housed in a 38-lead plastic TSSOP package (FE38(31) variation) with missing pins for high-voltage spacing; exposed pad (Pin 39) is connected to PGND/GND and must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main supply input | Accepts 10.5–16V for LT3752-1; powers INTVCC regulator and forward controller circuits. |
| INTVCC | Internal LDO output | 9.4–10.4V regulated supply for gate drivers and internal logic; OVLO/UVLO protected. |
| OUT | Main power switch driver | Drives primary-side MOSFET; 11.9V high-level, <20ns transition times, programmable min ON time (325ns). |
| AOUT | Active clamp switch driver | HI-side NMOS driver for active clamp topology; supports programmable tAO/tOA delays for ZVS optimization. |
| SOUT | Synchronous rectifier driver | Controls secondary-side SR MOSFET; timing delays tSO/tOS programmable for optimal FET overlap control. |
| HOUT | Housekeeping switch driver | Drives auxiliary buck/boost converter; 90–95% max duty cycle, 350ns min ON time. |
| HFB | Housekeeping feedback | 0.90–1.10V reference input; enables PGOOD (0.92–0.96V), OVLO (1.15–1.206V), and soft-start control. |
| UVLO_VSEC | Volt-second clamp programming | Sets DVSEC threshold; 0.2–0.6V micropower threshold enables precise duty cycle limiting above 50%. |
| RT | Oscillator timing | Resistor sets forward controller frequency (100–500kHz); also programs housekeeping oscillator when folded back. |
| SS1 / SS2 | Soft-start/stop control | SS1 controls frequency/DVSEC ramp-up; SS2 controls COMP pin soft-start; charge/discharge currents specified per temp. |
| ISENSEP / ISENSEN | Main loop current sense | Differential inputs for primary current sensing; 180–260mV threshold, 6.1V/V gain, <33µA input current at 80% duty. |
| HISENSE | Housekeeping current sense | Peak current threshold 69–86.5mV; 9.1V/V gain; supports cycle-by-cycle OCP and slope compensation. |
| FB | Main output feedback | 1.22–1.275V reference; 50–200nA bias current; used with optocoupler or direct sensing for isolated regulation. |
| SYNC | External clock sync | 1.2–1.8V high threshold; accepts 1.0–1.25× programmed fOSC for multi-phase or noise-sensitive systems. |
| GND / PGND | Ground returns | Separate analog/digital (GND) and power (PGND) grounds; Pin 39 exposed pad ties both to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| HI-side active clamp topology | Enables efficient high-input-voltage forward converters by reducing primary switch voltage stress and allowing >50% duty cycles. |
| Integrated housekeeping DC/DC controller | Eliminates need for external auxiliary supply; provides regulated rail with soft-start, hiccup OCP, and PGOOD signaling. |
| Programmable volt-second clamp (DVSEC) | Prevents transformer saturation via UVLO_VSEC pin; supports precise duty cycle limits tied to minimum input voltage. |
| Synchronous rectification timing control | Independent tSO/tOS delay programming ensures optimal gate drive sequencing for secondary-side SR FETs, minimizing conduction loss. |
| AEC-Q100 qualified | Validated for automotive environments including extended temperature operation (–40°C to +125°C) and robust ESD/lifetime testing. |
Applications
| Automotive High-Voltage DC/DC | 48V Telecom Isolated Supplies |
|---|---|
Use Scenario: 400V battery-to-12V/150W isolated DC/DC conversion in EV power distribution units. IC Role / Device Role / Timing Role: LT3752EFE-1#TRPBF serves as active clamp forward controller managing primary switch (OUT), HI-side clamp (AOUT), and synchronous rectifier (SOUT) with precise timing delays. Use Value: Enables >94% efficiency at 48VIN/12.5AOUT while maintaining ZVS operation and eliminating transformer reset issues. | Use Scenario: Isolated 48V-to-12V/150W power module for telecom base station RF amplifiers. IC Role / Device Role / Timing Role: LT3752EFE-1#TRPBF implements HI-side active clamp control with programmable DVSEC to handle wide-line transients and maintain regulation under load steps. Use Value: Supports 100–500kHz operation with <25ns gate drivers, enabling compact magnetics and reduced EMI filtering requirements. |
| Industrial HV Power Supplies | Military Ruggedized Converters |
Use Scenario: 270V aircraft bus-to-28V isolated supply in avionics power management systems. IC Role / Device Role / Timing Role: LT3752EFE-1#TRPBF acts as dual-loop controller: forward converter (OUT/AOUT/SOUT) for main output and housekeeping controller (HOUT/HFB) for auxiliary rails. Use Value: Integrated housekeeping controller eliminates discrete bias supply, reducing BOM count and improving startup reliability under cold-crank conditions. | Use Scenario: Ruggedized 28V-to-5V/3.3V isolated converter for military vehicle electronics with MIL-STD-1275 compliance. IC Role / Device Role / Timing Role: LT3752EFE-1#TRPBF provides hiccup-mode overcurrent protection, programmable UVLO/OVLO hysteresis, and AEC-Q100-qualified thermal performance. Use Value: Ensures safe shutdown during load faults and maintains stable operation across –40°C to +125°C ambient without derating. |
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 |
|---|---|---|---|
| LT3752EFE#TRPBF | Supports 6.5–100V input; LO-side active clamp topology; INTVCC = 6.6–7.2V; lower VIN start-up current (170–265µA vs. 265–390µA). | Optimized for sub-100V industrial/telecom systems; not rated for >100V direct input without external pre-regulator. | Select LT3752EFE#TRPBF when input stays below 100V and LO-side clamp layout is preferred. |
| UCC2897AIPW | TI active clamp forward controller; no integrated housekeeping DC/DC; 12–100V input; fixed 500kHz max frequency; requires external bias supply. | Lacks auxiliary rail generation; needs external IC or winding for housekeeping power; less integrated for space-constrained designs. | Choose UCC2897AIPW when leveraging TI's ecosystem or requiring pin-compatible upgrade from legacy UCC2897. |
Compared with LT3752EFE#TRPBF and UCC2897AIPW, the LT3752EFE-1#TRPBF uniquely combines >100V input capability, HI-side active clamp architecture, and fully integrated housekeeping controller - reducing component count and improving startup robustness in high-reliability automotive and military systems.
Availability
LT3752EFE-1#TRPBF is available at Aetrix Electronics and suitable for automotive power distribution, 48V telecom infrastructure, and industrial HV DC/DC conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT3752EFE-1#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 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 product line delivers highly integrated active clamp forward controllers targeting high-efficiency, high-reliability isolated power conversion in automotive, telecom, and industrial applications where input voltage exceeds 100V and board space is constrained.
FAQ
What is the maximum input voltage supported by the LT3752EFE-1#TRPBF?
The LT3752EFE-1#TRPBF itself operates from 10.5V to 16V on its VIN pin, but is specifically designed for applications where the system input voltage exceeds 100V - achieved using external components such as a pre-regulator or resistive divider network. Its absolute maximum VIN rating is 16V, and it relies on external circuitry to safely interface with >100V sources. This distinguishes it from the standard LT3752, which supports up to 100V directly.
How does the LT3752EFE-1#TRPBF implement HI-side active clamp control?
The LT3752EFE-1#TRPBF uses its AOUT pin to drive an external NMOS transistor in a HI-side configuration, enabling active clamp reset of the main transformer. Unlike the LT3752 (LO-side clamp), this topology allows higher efficiency and better voltage stress management at elevated input voltages. Timing delays tAO and tOA are independently programmable via resistors to optimize zero-voltage switching and minimize circulating energy.
Does the LT3752EFE-1#TRPBF include an integrated auxiliary power supply?
Yes, the LT3752EFE-1#TRPBF integrates a complete housekeeping DC/DC controller with dedicated pins (HOUT, HCOMP, HFB) to generate and regulate an auxiliary output rail. It supports soft-start, hiccup-mode overcurrent protection, output overvoltage detection, and power-good signaling - eliminating the need for a separate bias supply in most isolated forward converter designs.
What is the purpose of the UVLO_VSEC pin on the LT3752EFE-1#TRPBF?
The UVLO_VSEC pin on the LT3752EFE-1#TRPBF programs the volt-second clamp (DVSEC) threshold, which limits the maximum duty cycle to prevent transformer saturation. By applying a voltage between 0.2V and 0.6V, designers set a precise clamp level tied to the minimum system input voltage - enabling reliable operation above 50% duty cycle while maintaining stability across line and load variations.
Is the LT3752EFE-1#TRPBF qualified for automotive applications?
Yes, the LT3752EFE-1#TRPBF is AEC-Q100 qualified for automotive applications and rated for operation from –40°C to +125°C junction temperature (E-grade). It meets stringent automotive reliability, ESD, and lifetime requirements, making it suitable for use in EV power distribution, ADAS subsystems, and infotainment power supplies where high-voltage isolation and functional safety are critical.
LT3752EFE-1#TRPBF 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):
- 10.5V ~ 16V
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3752EFE-1#TRPBF FAQ
1.How can I place an order for LT3752EFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752EFE-1#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 LT3752EFE-1#TRPBF reliable?
The price and inventory of LT3752EFE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752EFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3752EFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752EFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752EFE-1#TRPBF?
LT3752EFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752EFE-1#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 LT3752EFE-1#TRPBF?
For technical support, including LT3752EFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752EFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3752EFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3752EFE-1#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 LT3752EFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3752EFE-1#TRPBF?
All LT3752EFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752EFE-1#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 LT3752EFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3752EFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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