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Analog Devices Inc. LT3752HFE#TRPBF
- Part No.:
- LT3752HFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752HFE#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
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Product details
Overview
LT3752HFE#TRPBF from Analog Devices is a high-voltage active clamp synchronous forward controller IC with integrated housekeeping DC/DC controller, supporting 6.5V–100V input, programmable 100kHz–500kHz switching frequency, volt-second clamp for >50% duty cycle, and AEC-Q100 qualification for automotive isolated power supplies.
For engineers reviewing the LT3752HFE#TRPBF datasheet, LT3752HFE#TRPBF pinout, LT3752HFE#TRPBF application, or LT3752HFE#TRPBF equivalent, this page delivers verified technical context, real-world timing parameters (tAO, tOS, tSO), thermal-rated package details (–40°C to 150°C), and validated alternatives for offline and HV car battery forward converter designs.
Technical Context
The LT3752HFE#TRPBF implements dual-loop control: a main forward controller with adaptive leading-edge blanking, programmable DVSEC volt-second clamp, and three independent gate drivers (OUT, AOUT, SOUT) for primary switch, active clamp MOSFET, and synchronous rectifier. It supports LO-side active clamp topology with precise timing delays (tAO, tOA, tSO, tOS) set via external resistors.
Its integrated housekeeping controller provides auxiliary 12V/1A output via HOUT, featuring soft-start, hiccup-mode overcurrent protection, and programmable output voltage (0.9V–1.1V HFB reference). INTVCC linear regulator delivers 7.0V ±0.2V at up to 50mA, with UVLO (4.75V/4.6V) and OVLO (15.4V/17.2V) thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6.5V to 100V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; line regulation ≤0.1%/V ensures stable operation across input range. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive and high-ambient industrial environments. |
| INTVCC Regulator | 7.0V ±0.2V @ 50mA - powers internal circuitry and gate drivers; dropout ≤0.8V at 10mA enables low-VIN start-up. |
| FB Reference Voltage | 1.250V ±25mV - precision error amplifier reference for accurate output voltage regulation in main loop. |
| Volt-Second Clamp | Programmable via UVLO_VSEC pin - enables >50% duty cycle for high transformer utilization in forward topologies. |
| AOUT/SOUT Timing Delays | tAO = 168–403ns, tOS = 52–164ns - externally adjustable via RT resistors to optimize ZVS/ZCS transitions and minimize switching loss. |
Pinout & Package
The LT3752HFE#TRPBF is housed in a 38-lead plastic TSSOP package (FE38 variation) with missing pins for high-voltage creepage spacing. Exposed pad (Pin 39) is connected to PGND/GND and must be soldered to PCB for thermal and electrical integrity. θJA = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 6.5V–100V DC; powers forward controller and INTVCC regulator. |
| INTVCC | Internal LDO output | 7.0V regulated supply for gate drivers and internal logic; requires 2.2µF bypass capacitor. |
| OUT | Main switch driver | Drives primary-side N-channel MOSFET; 19ns rise/fall time into 3.3nF load. |
| AOUT | Active clamp driver | Controls external PMOS clamp switch; timing delay tAO/tOA programmable for ZVS optimization. |
| SOUT | Synchronous rectifier driver | Drives secondary-side N-channel MOSFET; tSO/tOS delays prevent shoot-through in forward topology. |
| FB | Main loop feedback | Connects to optocoupler or resistor divider; 1.250V reference sets output voltage accuracy. |
| HFB | Housekeeping feedback | 0.90–1.10V reference for auxiliary output regulation; enables PGOOD signaling. |
| ISENSEP/ISENSEN | Main current sense inputs | Differential sensing of primary current; 220mV typical threshold with 6.1V/V gain for slope compensation. |
| HISENSE | Housekeeping current sense | Monitors auxiliary inductor current; 79mV peak threshold enables cycle-by-cycle protection. |
| RT | Oscillator timing | Resistor sets forward controller frequency (100–500kHz); also programs DVSEC clamp ratio. |
| SS1/SS2 | Soft-start control | SS1 controls frequency/DVSEC ramp; SS2 controls COMP pin soft-start to prevent overshoot. |
| UVLO_VSEC | Volt-second clamp input | Analog input setting maximum volt-sec product; determines max duty cycle (17.5–76.2%) per system VIN(min). |
| GND/PGND | Signal & power ground | Separate GND (Pin 20) and PGND (Pins 19, 39) reduce noise coupling in high-dI/dt paths. |
Key Features
| Feature | Design Value |
|---|---|
| LO-side active clamp control | Reduces primary switch voltage stress below VIN × 2, enabling use of lower-RDS(on) MOSFETs and improving efficiency by ≥3% vs. conventional forward. |
| Programmable volt-second clamp | Enables >50% duty cycle (up to 76.2%) without saturation, increasing transformer and rectifier utilization in high-step-down applications. |
| Synchronous rectification support | Independent SOUT driver with adjustable tSO/tOS delays eliminates body-diode conduction loss on secondary side, boosting full-load efficiency to 94%. |
| AEC-Q100 Grade H qualification | Guaranteed operation from –40°C to +150°C junction temperature with automotive-grade reliability testing and traceable lot control. |
| Integrated housekeeping controller | Eliminates need for external auxiliary supply; delivers regulated 12V/1A output with hiccup-mode OCP and soft-start for system-level power sequencing. |
Applications
| Automotive HVAC Power Supply | 48V Telecom Isolated DC/DC |
|---|---|
Use Scenario: Isolated 12V/12.5A power rail for HVAC blower motor control in 48V mild-hybrid vehicles. IC Role / Device Role / Timing Role: LT3752HFE#TRPBF acts as active clamp forward controller managing primary switch (OUT), clamp switch (AOUT), and synchronous rectifier (SOUT) with precise tAO/tOS timing. Use Value: Achieves 94% efficiency at 48VIN/10AOUT while meeting AEC-Q100 H-grade thermal requirements under hood (150°C junction). | Use Scenario: Isolated 12V/10A auxiliary supply for base station RF power amplifiers fed from 48V telecom bus. IC Role / Device Role / Timing Role: LT3752HFE#TRPBF implements high-efficiency forward conversion with programmable DVSEC clamp to maintain regulation during 48V input transients. Use Value: Enables >50% duty cycle operation during brownouts, sustaining output regulation where standard forward controllers fail. |
| Industrial PLC I/O Isolation | Military Vehicle DC/DC Converter |
Use Scenario: 24V-to-5V isolated supply for digital I/O modules in programmable logic controllers requiring reinforced insulation. IC Role / Device Role / Timing Role: LT3752HFE#TRPBF controls transformer reset via active clamp and regulates output using FB feedback with optocoupler isolation. Use Value: Integrated housekeeping controller powers auxiliary circuits (e.g., ADC references, level shifters) without extra ICs, reducing BOM count by 2–3 components. | Use Scenario: 28V-to-15V isolated converter for avionics subsystems in armored vehicles operating in extreme ambient conditions. IC Role / Device Role / Timing Role: LT3752HFE#TRPBF serves as ruggedized forward controller with 150°C junction rating and programmable OVLO/UVLO hysteresis for unstable vehicle battery inputs. Use Value: Micropower shutdown (<40µA) and robust start-up (265µA at VIN_ON) ensure reliable cold-cranking operation down to –55°C ambient. |
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 |
|---|---|---|---|
| LT3752IFE#TRPBF | Same functionality and pinout; rated for –40°C to 125°C junction (vs. 150°C for HFE grade). | Not qualified for under-hood automotive or high-ambient industrial use where >125°C junction occurs. | Select LT3752IFE#TRPBF only if thermal margin allows full derating below 125°C junction. |
| UCC2897AIPW | TI active clamp forward controller; no integrated housekeeping regulator; requires external bias supply. | Lacks auxiliary DC/DC capability - needs separate IC or winding for auxiliary rails, increasing complexity and cost. | Choose UCC2897AIPW when design already includes auxiliary supply and prioritizes TI ecosystem support over integration. |
Compared with LT3752IFE#TRPBF, the LT3752HFE#TRPBF enables higher ambient operation without thermal derating; versus UCC2897AIPW, it reduces system component count by integrating the housekeeping controller and associated regulation circuitry.
Availability
LT3752HFE#TRPBF is available at Aetrix Electronics and suitable for automotive HVAC systems, 48V telecom power supplies, and industrial PLC I/O isolation requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT3752HFE#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 industrial, automotive, communications, and healthcare markets.
The LT3752 product line delivers highly integrated active clamp forward controllers targeting high-reliability isolated DC/DC conversion in automotive, telecom, and military applications where efficiency, thermal robustness, and functional integration are critical.
FAQ
What is the maximum operating junction temperature for the LT3752HFE#TRPBF?
The LT3752HFE#TRPBF is specified for continuous operation from –40°C to +150°C junction temperature, making it suitable for under-hood automotive applications and high-ambient industrial environments. This rating is guaranteed per AEC-Q100 Grade H qualification and supported by thermal characterization data in the datasheet.
Does the LT3752HFE#TRPBF include an integrated auxiliary power supply?
Yes, the LT3752HFE#TRPBF integrates a complete housekeeping DC/DC controller with HOUT driver, HFB feedback, and HISENSE current sensing. It generates a regulated auxiliary output (typically 12V/1A) without external controller ICs, reducing system BOM and simplifying power tree design.
How is the volt-second clamp programmed on the LT3752HFE#TRPBF?
The volt-second clamp on the LT3752HFE#TRPBF is programmed via the UVLO_VSEC pin, which accepts an analog voltage (0.2V–0.6V micropower threshold) to set the maximum allowable volt-second product. This directly determines the maximum duty cycle (17.5%–76.2%) based on minimum input voltage, enabling >50% operation in forward converters.
What timing parameters define the relationship between OUT, AOUT, and SOUT in the LT3752HFE#TRPBF?
The LT3752HFE#TRPBF specifies key timing relationships: tAO (AOUT rise to OUT rise) = 168–403ns, tOS (OUT fall to SOUT rise) = 52–164ns, and tSO (SOUT fall to OUT rise) = ±132ns. These delays are externally adjustable via RT resistors to optimize zero-voltage switching and prevent shoot-through in synchronous forward topologies.
Is the LT3752HFE#TRPBF pin-compatible with other variants in the LT3752 family?
Yes, the LT3752HFE#TRPBF shares identical pinout, package (38-lead TSSOP), and electrical interface with all LT3752/LT3752-1 variants (EFE, IFE, MPFE), including LT3752-1 versions. Functional differences (e.g., input voltage range, INTVCC voltage) are internal and do not affect PCB layout or interconnect.
LT3752HFE#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):
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3752HFE#TRPBF FAQ
1.How can I place an order for LT3752HFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752HFE#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 LT3752HFE#TRPBF reliable?
The price and inventory of LT3752HFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3752HFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3752HFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752HFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752HFE#TRPBF?
LT3752HFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752HFE#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 LT3752HFE#TRPBF?
For technical support, including LT3752HFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752HFE#TRPBF requirements.
6.How does Aetrix verify that LT3752HFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3752HFE#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 LT3752HFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3752HFE#TRPBF?
All LT3752HFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752HFE#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 LT3752HFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3752HFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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