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Analog Devices Inc. LT3753IFE#TRPBF
- Part No.:
- LT3753IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 38-TFSOP (0.173", 4.40mm Width) 31 Leads, Exposed Pad
- Datasheet:
-
LT3753IFE#TRPBF.pdf
- Description:
- IC REG CTRLR FWRD CONV 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,874
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Product details
Overview
LT3753IFE#TRPBF from Analog Devices is a current-mode PWM controller optimized for active clamp synchronous forward converters, supporting 8.5V–100V input operation. It delivers programmable volt-second clamping (DVSEC), synchronous rectification control via SOUT, and precise timing delays (tAO, tSO, tOS) for high-efficiency isolated power conversion in telecom and industrial 48V systems.
For engineers reviewing the LT3753IFE#TRPBF datasheet, LT3753IFE#TRPBF pinout, LT3753IFE#TRPBF application, or LT3753IFE#TRPBF equivalent, key selection criteria include its 38-lead TSSOP package with high-voltage pin spacing, –40°C to 125°C operating junction temperature, 100kHz–500kHz programmable switching frequency, and integrated active clamp gate driver (AOUT) with <20ns rise/fall times.
Technical Context
The LT3753IFE#TRPBF implements a primary-side current-mode control architecture with adaptive leading-edge blanking and programmable slope compensation. Its volt-second clamp (DVSEC) is set via IVSEC and UVLO_VSEC pins, enabling open-loop VOUT regulation without optocoupler or secondary-side reference.
It integrates three independent gate drivers-OUT (main switch), AOUT (active clamp), and SOUT (synchronous rectifier)-each with user-programmable nonoverlap timing (tAO, tAS, tOS) and fast edge rates (<25ns). The IC supports hiccup-mode overcurrent protection, soft-start/stop via SS1/SS2, and synchronization to external clocks up to 500kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8.5V to 100V - enables direct operation from 48V telecom rails and wide-input industrial supplies without pre-regulation. |
| Switching Frequency | 100kHz to 500kHz - programmable via RT resistor; allows optimization of magnetics size vs. efficiency trade-offs. |
| DVSEC Clamp Accuracy | ±4% duty cycle error at 72.5% max - ensures reliable transformer reset and prevents saturation during load transients. |
| AOUT/SOUT/OUT Rise Time | <25ns (CL = 1nF) - minimizes dead-time losses and supports high-frequency MOSFETs with low gate charge. |
| Operating Temperature | –40°C to 125°C junction - qualified for industrial and extended-temperature embedded power applications. |
| OC Threshold | 96mV ±13.5mV - precise primary-side overcurrent detection enabling robust hiccup-mode fault response. |
| INTVCC Regulator | 10V ±0.6V, 32mA max - powers all gate drivers internally; dropout voltage <0.6V enables stable operation down to VIN = 8.75V. |
Pinout & Package
LT3753IFE#TRPBF is housed in a 38-lead plastic TSSOP (FE package) with missing pins (23, 25, 27, 29, 31, 33, 35) for enhanced high-voltage creepage and reliability in isolated topologies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (28) | Main supply input | Accepts 8.5V–100V; powers internal LDO (INTVCC) and bias circuitry. |
| OUT (24) | Main switch gate driver | Drives N-channel MOSFET gate with 0V–10V swing; includes active pull-down in shutdown. |
| AOUT (32) | Active clamp switch driver | Controls external clamp MOSFET; timing relative to OUT programmable via TAO/TAS resistors. |
| SOUT (30) | Synchronous rectifier driver | Generates secondary-side gate signal; delay relative to OUT set by TOS resistor. |
| IVSEC (8) | DVSEC clamp programming | Resistor sets maximum duty cycle inversely proportional to VIN - critical for transformer reset stability. |
| UVLO_VSEC (9) | Volt-second clamp enable & UVLO | Resistor divider sets both DVSEC threshold and system undervoltage lockout with 5µA hysteresis current. |
| PGND (19, 38, 39) | Power ground | Exposed pad (Pin 39) must be soldered to PCB ground plane for thermal management and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable volt-second clamp (DVSEC) | Enables >50% duty cycles while preventing transformer saturation - eliminates need for optocoupler in open-loop regulated designs. |
| Independent timing control (tAO, tAS, tOS) | Three dedicated pins (TAO, TAS, TOS) allow precise nonoverlap tuning between main, clamp, and sync switches - reduces shoot-through and conduction losses. |
| Hiccup-mode overcurrent protection | 96mV OC threshold with automatic restart after fault clearance - protects primary MOSFETs under short-circuit without latch-up. |
| Soft-start/soft-stop via SS1 & SS2 | SS1 controls frequency and DVSEC ramp-up/down; SS2 independently manages COMP pin - enables controlled startup and graceful shutdown. |
| Synchronizable oscillator | SYNC pin accepts external clock up to 500kHz with ±25% tolerance - supports multi-phase or noise-sensitive system-level timing coordination. |
Applications
| 48V Telecom Isolated PSU | Industrial DC-DC Brick |
|---|---|
Use Scenario: 36V–72V input, 5V/20A isolated output for base station power modules. IC Role / Device Role / Timing Role: Primary-side controller managing active clamp reset, synchronous rectification, and volt-second-limited duty cycle. Use Value: Enables >92% efficiency at full load with no transformer saturation risk across line and load transients. |
Use Scenario: 24V–100V input, 12V/15A isolated output for factory automation PLC power supplies. IC Role / Device Role / Timing Role: Core PWM controller implementing programmable UVLO/OVLO, hiccup OCP, and thermal-safe operation. Use Value: Supports wide input range and ruggedized fault handling required for unregulated industrial bus voltages. |
| Automotive EV Charging Auxiliary Supply | Military Vehicle Power System |
Use Scenario: 12V–60V battery-derived input powering isolated 3.3V/5V logic rails for on-board chargers. IC Role / Device Role / Timing Role: Active clamp forward controller delivering stable output despite wide battery voltage swings. Use Value: DVSEC clamp maintains consistent transformer volt-second balance from cold-crank (6V) to load-dump (60V) conditions. |
Use Scenario: 28V aircraft bus input generating 5V/10A isolated supply for avionics subsystems. IC Role / Device Role / Timing Role: High-reliability PWM controller with –40°C to 125°C operation and exposed-pad thermal path. Use Value: TSSOP package with missing pins meets MIL-STD-704E creepage requirements for airborne isolation barriers. |
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 | HI-side active clamp topology; different pinout and timing architecture; no SOUT output. | Designed for high-side clamp configurations only; not suitable for LO-side clamp layouts used with LT3753IFE#TRPBF. | Select when topology requires high-side clamp switch and secondary-side synchronous control is unnecessary. |
| UCC2897APW | Fixed 50% max duty cycle; no programmable DVSEC; no integrated SOUT driver; different UVLO/OVLO implementation. | Lacks volt-second clamp and synchronous rectifier control - requires external circuits for transformer reset and secondary-side drive. | Choose only for cost-sensitive, lower-power designs where open-loop regulation and advanced timing are not required. |
Compared with LT3753IFE#TRPBF, LT3752IFE#TRPBF supports high-side clamp but omits synchronous rectification control, while UCC2897APW lacks DVSEC and requires external timing components - making LT3753IFE#TRPBF uniquely suited for high-efficiency, isolated forward converters demanding programmable reset and integrated sync drive.
Availability
LT3753IFE#TRPBF is available at Aetrix Electronics and suitable for 48V telecom isolated PSUs, industrial DC-DC bricks, and automotive auxiliary supplies requiring stable component supply and long-term production continuity.
Supply support for LT3753IFE#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, automotive, and communications markets.
The LT3753IFE#TRPBF belongs to Analog Devices' Power by Linear™ active clamp controller family, engineered specifically for high-efficiency, high-voltage isolated forward converters in telecom and industrial infrastructure.
FAQ
What is the maximum operating junction temperature for the LT3753IFE#TRPBF?
The LT3753IFE#TRPBF is rated for a junction temperature range of –40°C to 125°C. This grade is fully specified and guaranteed across that range, with thermal performance validated via package-exposed pad (Pin 39) soldering to PCB ground. Exceeding 125°C risks triggering thermal shutdown and permanent parametric shift. For LT3753IFE#TRPBF, thermal design must maintain die temperature ≤125°C under worst-case load and ambient conditions.
Can the LT3753IFE#TRPBF operate without an optocoupler in isolated applications?
Yes, the LT3753IFE#TRPBF supports optocoupler-less operation via its programmable volt-second clamp (DVSEC). When configured with appropriate IVSEC and UVLO_VSEC resistors, it regulates output voltage by maintaining constant volt-seconds across the transformer primary - enabling stable open-loop regulation without secondary-side feedback. This capability is explicitly documented in the LT3753IFE#TRPBF datasheet Section "DVSEC Open Loop Control".
How is the switching frequency programmed on the LT3753IFE#TRPBF?
The switching frequency of the LT3753IFE#TRPBF is set by a single resistor (RT) connected from Pin 3 (RT) to GND. Typical values range from 14kΩ (500kHz) to 82.5kΩ (100kHz), with tight tolerance required for precise frequency setting. The LT3753IFE#TRPBF datasheet Table "Oscillator" provides exact RT values and tolerances for each target frequency, including line regulation (0.1%/V) and temperature drift performance.
What is the function of the TBLNK pin on the LT3753IFE#TRPBF?
The TBLNK pin (Pin 14) on the LT3753IFE#TRPBF programs extended blanking duration for the ISENSEP and OC comparators during MOSFET turn-on. A resistor from TBLNK to GND sets blanking time (e.g., 14.7kΩ ≈ 325ns, 73.2kΩ ≈ 454ns), suppressing false overcurrent triggers caused by gate-drive-induced current spikes. This feature is essential for reliable operation with fast-switching MOSFETs in the LT3753IFE#TRPBF-based forward converter.
Does the LT3753IFE#TRPBF support synchronization to an external clock?
Yes, the LT3753IFE#TRPBF supports external clock synchronization via the SYNC pin (Pin 6). It accepts TTL/CMOS-compatible clock signals from 100kHz to 500kHz with ±25% frequency tolerance. The internal oscillator locks to the external clock within one cycle, enabling noise reduction in EMI-sensitive environments and phase alignment in multi-rail systems - a confirmed capability detailed in the LT3753IFE#TRPBF datasheet "Synchronizing to an External Clock" section.
LT3753IFE#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):
- 8.5V ~ 100V
- Frequency - Switching:
- 100kHz ~ 500kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP-EP
LT3753IFE#TRPBF FAQ
1.How can I place an order for LT3753IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3753IFE#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 LT3753IFE#TRPBF reliable?
The price and inventory of LT3753IFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3753IFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3753IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3753IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3753IFE#TRPBF?
LT3753IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3753IFE#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 LT3753IFE#TRPBF?
For technical support, including LT3753IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3753IFE#TRPBF requirements.
6.How does Aetrix verify that LT3753IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3753IFE#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 LT3753IFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3753IFE#TRPBF?
All LT3753IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3753IFE#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 LT3753IFE#TRPBF part is unused and in its original packaging.
Return procedure for LT3753IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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