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Analog Devices Inc. LT3752HFE-1#TRPBF
- Part No.:
- LT3752HFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3752HFE-1#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
LT3752HFE-1#TRPBF from Analog Devices is a high-voltage active clamp synchronous forward controller optimized for input voltages >100V, featuring programmable volt-second clamp (DVSEC), integrated housekeeping DC/DC controller, and dual gate drivers (AOUT for active clamp NMOS, SOUT for synchronous rectification). It operates up to 150°C junction temperature and supports 100–500kHz switching frequency in isolated power supplies for telecom and industrial systems.
For engineers reviewing the LT3752HFE-1#TRPBF datasheet, LT3752HFE-1#TRPBF pinout, LT3752HFE-1#TRPBF application, or LT3752HFE-1#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specs per Rev. C datasheet, and real-world timing parameters for active clamp and synchronous rectifier control in high-input-voltage forward converters.
Technical Context
The LT3752HFE-1#TRPBF implements a current-mode PWM architecture with separate forward and housekeeping controllers. Its HI-side active clamp topology (LT3752-1 variant) uses AOUT to drive external NMOS clamp switches, while SOUT controls secondary-side synchronous rectifiers with programmable tSO/tOS delays. The DVSEC clamp enables >50% primary duty cycles by limiting volt-seconds across the transformer.
It integrates an internal linear regulator (INTVCC = 9.4–10.4V) with 7–7.4V UVLO(+) and 15.4–17.2V OVLO, plus independent housekeeping loop with HFB reference (0.90–1.10V) and HISENSE overcurrent protection (84.6–105.4mV threshold). All timing, soft-start, and hiccup-mode protections are fully programmable via external resistors and capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 10.5V to 16V - Validated operating range for LT3752-1 variant; supports HV car battery and offline inputs above 100V via external components. |
| Switching Frequency | 100kHz to 500kHz - Programmable via RT resistor; line regulation ≤0.1%/V ensures stable operation across input range. |
| INTVCC Regulator | 10V ±0.6V - Internal LDO powers gate drivers; UVLO(+) = 7.0–7.4V, OVLO = 15.4–17.2V prevents latch-up during transients. |
| DVSEC Clamp Accuracy | ±4% duty cycle error - Enables precise volt-second limiting at UVLO_VSEC = 1.25V/2.5V/5.0V for transformer reset control. |
| Junction Temperature Range | –40°C to +150°C - H-grade qualification ensures reliability in under-hood automotive and industrial environments. |
| AOUT/SOUT Timing Resolution | tAO = 168–403ns, tOS = 52–164ns - Nanosecond-level delay programming allows fine-tuned dead-time control between main switch and clamp/rectifier. |
| Housekeeping Controller | HFB ref = 1.000V ±0.1V - Independent 300kHz housekeeping loop powers auxiliary rails with hiccup-mode OCP and PGOOD monitoring. |
Pinout & Package
LT3752HFE-1#TRPBF is housed in a 38-lead plastic TSSOP package (FE38 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 integrity. θJA = 25°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 10.5–16V for LT3752-1; powers forward controller and INTVCC LDO. |
| INTVCC | Internal LDO output | 10V regulated supply for gate drivers; requires 2.2µF ceramic bypass capacitor. |
| AOUT | Active clamp switch driver | Drives external NMOS clamp FET; rise/fall time ≤23/19ns into 1nF load. |
| SOUT | Synchronous rectifier driver | Controls secondary-side MOSFETs; supports programmable tSO/tOS delays for zero-voltage switching. |
| OUT | Main power switch driver | Drives primary-side high-side MOSFET; 19ns rise/20ns fall into 3.3nF load. |
| HFB | Housekeeping feedback | 0.90–1.10V reference input for auxiliary DC/DC output voltage regulation. |
| UVLO_VSEC | Micropower start-up enable | 0.2–0.6V micropower threshold initiates startup; hysteresis current = 4–6µA. |
| RT | Oscillator timing | Resistor sets forward controller frequency (100–500kHz); tolerance directly impacts fOSC accuracy. |
| SS1 | Soft-start/stop control | Charges to 1.25V to enable switching; discharge current = 6.4–14.6µA for controlled shutdown. |
| PGND / GND | Power/ground return | Separate PGND (Pins 20,21,39) and signal GND (Pin 18) minimize noise coupling in high-dI/dt paths. |
Key Features
| Feature | Design Value |
|---|---|
| HI-side active clamp topology | Enables efficient transformer reset for >100V inputs using external NMOS clamp switch driven by AOUT. |
| Programmable volt-second clamp (DVSEC) | Three-point calibration (1×/2×/4× system input) allows precise duty-cycle limiting without optocoupler feedback. |
| Dual independent controllers | Forward controller (OUT/AOUT/SOUT) and housekeeping controller (HOUT/HFB/HISENSE) operate simultaneously with separate loops. |
| Nanosecond timing resolution | Programmable delays (tAO, tOA, tSO, tOS) down to 52ns enable tight dead-time control for ZVS in synchronous rectification. |
| AEC-Q100 qualified H-grade | Rated for –40°C to +150°C junction temperature; validated for automotive under-hood power conversion. |
| Hiccup-mode overcurrent protection | OC pin triggers automatic restart after fault clearance; threshold = 82.5–107.5mV with 1.61–2.19V VIN hysteresis. |
Applications
| Telecom 48V Isolated PSU | Automotive HV Battery Converter |
|---|---|
|
Use Scenario: 48V telecom system requiring isolated 12V/12.5A output with >94% efficiency. IC Role / Device Role / Timing Role: LT3752HFE-1#TRPBF serves as active clamp forward controller managing primary switch (OUT), NMOS clamp (AOUT), and synchronous rectifier (SOUT) with tSO/tOS delays calibrated for ZVS. Use Value: Enables 150W output with 50%+ duty cycle via DVSEC clamp, reducing transformer size and improving utilization vs. conventional forward topologies. |
Use Scenario: 12V auxiliary rail generation from 400V+ EV battery pack using multi-stage isolation. IC Role / Device Role / Timing Role: LT3752HFE-1#TRPBF operates in HI-side clamp mode to handle >100V input; its H-grade rating ensures reliability at 150°C under hood. Use Value: Integrated housekeeping controller powers gate drivers and logic without external bias supply, simplifying BOM and improving startup robustness. |
| Industrial HV AC-DC Adapter | Military Ruggedized Power Supply |
|
Use Scenario: Offline 230VAC-to-12V isolated converter for factory automation equipment. IC Role / Device Role / Timing Role: LT3752HFE-1#TRPBF manages active clamp reset and synchronous rectification while supporting 100–500kHz programmable frequency for EMI optimization. Use Value: Programmable OVLO/UVLO with hysteresis (1.61–2.19V) provides precise input protection against brownouts and surges in harsh industrial environments. |
Use Scenario: MIL-STD-1275 compliant 28V-to-5V/3.3V isolated converter for avionics subsystems. IC Role / Device Role / Timing Role: LT3752HFE-1#TRPBF delivers hiccup-mode OCP and soft-stop shutdown (SS1-controlled) for fault containment in mission-critical systems. Use Value: Exposed-pad TSSOP package with θJA = 25°C/W enables conduction cooling in sealed enclosures without forced airflow. |
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#TRPBF | LT3752 variant rated for 6.5–100V input; uses LO-side active clamp (PMOS-driven AOUT); INTVCC = 7V. | Preferred for <100V inputs where LO-side clamp simplifies layout; not suitable for >100V direct connection. | Select LT3752HFE#TRPBF only when input stays below 100V and LO-side clamp topology is acceptable. |
| UCC2897APWR | Texas Instruments part with 16–100V input; no integrated housekeeping controller; fixed 500kHz max frequency; no DVSEC clamp. | Requires external bias supply and optocoupler-based feedback; lacks nanosecond timing programmability for ZVS. | Choose UCC2897APWR only if cost sensitivity outweighs need for integrated housekeeping, DVSEC, and precision timing. |
Compared with LT3752HFE#TRPBF, the LT3752HFE-1#TRPBF supports higher input voltages via HI-side NMOS clamp and eliminates external bias requirements with its integrated housekeeping controller, while UCC2897APWR offers lower cost but sacrifices integration, timing flexibility, and clamp control precision.
Availability
LT3752HFE-1#TRPBF is available at Aetrix Electronics and suitable for telecom 48V isolated PSUs, automotive HV battery converters, and industrial offline power supplies requiring stable component supply, extended temperature operation, and AEC-Q100 compliance.
Supply support for LT3752HFE-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 industrial, automotive, communications, and healthcare markets.
The LT3752/LT3752-1 product line was designed specifically for high-efficiency active clamp forward converters in high-input-voltage applications, integrating dual controllers and nanosecond timing to replace discrete solutions in telecom, automotive, and military power systems.
FAQ
What is the maximum input voltage supported by the LT3752HFE-1#TRPBF?
The LT3752HFE-1#TRPBF is optimized for applications with input voltages greater than 100V. Its operational input voltage range is specified as 10.5V to 16V for the internal circuitry, but the datasheet explicitly states that the LT3752-1 variant's input limit is "limited only by external components" - enabling safe operation from 100V up to several hundred volts with appropriate external FETs, snubbers, and layout practices. This distinguishes it from the LT3752 (non-1) variant capped at 100V.
How does the LT3752HFE-1#TRPBF implement active clamp control?
The LT3752HFE-1#TRPBF uses HI-side active clamp topology, driving an external NMOS transistor via the AOUT pin. Unlike the LT3752 (which drives a PMOS on the low side), the -1 variant's AOUT is optimized for NMOS gate drive with fast rise/fall times (23ns/19ns) and programmable tAO/tOA delays. This allows precise control of clamp timing relative to the main OUT switch, minimizing voltage stress and enabling >50% duty cycles via the DVSEC volt-second clamp function.
Does the LT3752HFE-1#TRPBF include an integrated housekeeping controller?
Yes, the LT3752HFE-1#TRPBF integrates a fully independent housekeeping DC/DC controller with dedicated pins (HFB, HCOMP, HISENSE, HOUT). It regulates an auxiliary output using HFB's 0.90–1.10V reference, provides hiccup-mode overcurrent protection via HISENSE (84.6–105.4mV threshold), and generates a Power Good signal. This eliminates the need for an external bias supply, reducing component count and improving startup reliability in high-voltage systems.
What timing parameters are programmable on the LT3752HFE-1#TRPBF?
The LT3752HFE-1#TRPBF supports nanosecond-level programmable delays: tAO (AOUT rise to OUT rise) and tOA (OUT fall to AOUT edge) set via RTAO resistor; tAS (AOUT to SOUT fall) via RTAS; tSO (SOUT fall to OUT rise) and tOS (OUT fall to SOUT rise) via RTAS/RTOS. These allow precise dead-time tuning for zero-voltage switching in both active clamp and synchronous rectification stages - critical for efficiency in high-frequency forward converters.
Is the LT3752HFE-1#TRPBF qualified for automotive applications?
Yes, the LT3752HFE-1#TRPBF is AEC-Q100 qualified and rated for a junction temperature range of –40°C to +150°C. Its H-grade temperature specification, combined with features like hiccup-mode OCP, programmable UVLO/OVLO hysteresis, and robust gate drivers, makes it suitable for automotive applications including HV battery auxiliary power supplies and under-hood DC-DC conversion where reliability at elevated temperatures is mandatory.
LT3752HFE-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3752HFE-1#TRPBF FAQ
1.How can I place an order for LT3752HFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3752HFE-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 LT3752HFE-1#TRPBF reliable?
The price and inventory of LT3752HFE-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 LT3752HFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3752HFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3752HFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3752HFE-1#TRPBF?
LT3752HFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3752HFE-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 LT3752HFE-1#TRPBF?
For technical support, including LT3752HFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3752HFE-1#TRPBF requirements.
6.How does Aetrix verify that LT3752HFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3752HFE-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 LT3752HFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3752HFE-1#TRPBF?
All LT3752HFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3752HFE-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 LT3752HFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT3752HFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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