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Analog Devices Inc. LT3511EMS#TRPBF
- Part No.:
- LT3511EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3511EMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 240MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,625
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Product details
Overview
LT3511EMS#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-voltage isolated flyback controller IC with integrated 240mA/150V power switch, boundary-mode operation, primary-side regulation, and no opto-isolator or third winding required. It operates from 4.5V to 100V input and delivers up to 2.5W of isolated output power in telecom auxiliary supplies and industrial housekeeping rails.
For engineers reviewing the LT3511EMS#TRPBF datasheet, LT3511EMS#TRPBF pinout, LT3511EMS#TRPBF application, or LT3511EMS#TRPBF equivalent, this page provides verified technical context, confirmed pin functions, real-world transformer design constraints, boundary-mode timing behavior, and validated alternative controllers for isolated flyback designs requiring primary-side feedback and wide-input operation.
Technical Context
The LT3511EMS#TRPBF implements current-mode boundary conduction mode (BCM) control using a DCM comparator that detects zero-current crossing on the secondary winding via reflected voltage at the SW pin. Its flyback error amplifier samples the RFB/RREF-derived voltage during the zero-current interval to regulate output without optocoupler or auxiliary winding.
It integrates a 150V-rated bipolar power switch, internal bias regulator (BIAS pin), temperature-compensated reference (RREF = 1.17–1.23V), and VC-based compensation node. The TC pin sources proportional-to-absolute-temperature (PTAT) current into RREF to offset diode forward-voltage drift across –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports wide-range industrial, telecom, and automotive inputs without external pre-regulation. |
| Integrated Switch Rating | 240mA continuous, 150V VCE(SAT) - enables compact isolated flyback designs up to 2.5W without external MOSFET. |
| RREF Voltage | 1.17V to 1.23V (±2.5% over temp) - precision bandgap reference used with RFB/RREF resistors to set output voltage. |
| Switching Frequency Range | 40kHz to 650kHz - variable-frequency BCM operation ensures stable zero-current switching and eliminates subharmonic oscillation. |
| EN/UVLO Threshold | 1.15V to 1.27V with 2.6μA hysteresis - allows programmable undervoltage lockout using resistor divider from VIN. |
| Operating Junction Temp | –40°C to 125°C - qualified for extended industrial environments; MSOP package with θJA = 90°C/W. |
| Package | 16-lead MSOP (12-pin functional, 4 leads removed) - surface-mount, thermally enhanced layout for high-voltage isolation. |
Pinout & Package
LT3511EMS#TRPBF uses a 16-lead plastic MSOP package with four leads internally removed (pins 2, 4, 13, 15 are NC). Thermal pad is not electrically connected; PCB copper area under exposed pad improves thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Starts converter when >1.21V; shuts down below threshold; 2.6μA hysteresis enables precise UVLO programming. |
| VIN (3) | Main Input Supply | Powers internal startup circuitry and serves as reference for DCM comparator; requires local bypass capacitor. |
| GND (5, 8, 9) | Ground Terminals | Three dedicated ground pins - must be tied directly to low-impedance local ground plane for noise immunity and stability. |
| BIAS (6) | Internal Bias Supply | Regulated ~3.1V output powers switch driver and core logic; can connect to VIN if <20V; requires 4.7μF ceramic bypass. |
| VC (10) | Error Amplifier Compensation | Connects to RC network for loop compensation; 100pF to ground suppresses noise; controls peak current limit level. |
| TC (11) | Temperature Compensation Input | Sources PTAT current into RREF; resistor to ground sets compensation slope to cancel diode VF drift. |
| RREF (12) | Reference Resistor Node | Accepts 10kΩ ground-referenced resistor; internal 1.2V bandgap develops reference voltage for feedback scaling. |
| RFB (14) | Feedback Input | Connects to SW node via resistor; samples reflected flyback pulse amplitude to derive output voltage information. |
| SW (16) | Switch Collector Output | Drives transformer primary; 150V rating allows high-VIN/high-turns-ratio designs; minimize trace area to reduce EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, and size while improving long-term reliability and dynamic response. |
| Boundary conduction mode (BCM) | Ensures zero-current switching every cycle - avoids subharmonic oscillation, improves light-load efficiency, and enables smaller magnetics. |
| Integrated 150V/240mA switch | Enables complete isolated flyback solution in single MSOP package - no external high-voltage transistor or gate driver required. |
| Temperature-compensated feedback | TC pin + RREF resistor cancels diode forward-voltage drift - maintains ±1% output regulation over –40°C to 125°C. |
| No external start-up resistor | Built-in high-voltage startup circuit draws current directly from VIN - simplifies design and improves efficiency at low input voltages. |
Applications
| Telecom Auxiliary Power | Industrial Housekeeping Supply |
|---|---|
|
Use Scenario: Providing isolated 5V/0.3A bias for line-card control logic and interface ICs in 48V telecom systems. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating output via reflected SW waveform sampling in boundary mode. Use Value: Eliminates optocoupler aging and unit-to-unit variation - ensures stable 12-year field life in NEBS-compliant equipment. |
Use Scenario: Generating isolated ±15V rails for analog sensor front-ends and ADC drivers in factory automation PLCs. IC Role / Device Role / Timing Role: High-voltage flyback controller operating from 24V–72V DC input with transformer turns ratio NPS = 2:1. Use Value: Delivers tight load regulation (<±1.5%) across 10–100% load with no secondary-side sensing components. |
| Automotive Body Control Module | Medical Isolated Monitoring Supply |
|
Use Scenario: Powering isolated CAN transceivers and microcontroller peripherals from 12V battery with cold-crank tolerance down to 4.5V. IC Role / Device Role / Timing Role: Wide-input flyback controller using boundary mode to maintain regulation during engine cranking transients. Use Value: Sustains regulated 3.3V output during 4.5V input dips - avoids MCU brownout resets in safety-critical modules. |
Use Scenario: Delivering reinforced-isolation 5V/0.1A supply for patient-connected ECG front-end amplifiers and isolation barriers. IC Role / Device Role / Timing Role: Medical-grade flyback controller meeting IEC 60601 creepage/clearance requirements via transformer selection. Use Value: Achieves <2mVpp output ripple and <0.1% line/load regulation - meets low-noise analog signal chain requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748IMS#TRPBF | Higher 200V switch rating, 1.2A current limit, no integrated BIAS regulator - requires external bias supply. | Supports >3W output power and higher input voltages; lacks TC pin for temperature compensation. | Choose when >2.5W output or >100V input is required; accept added complexity of external bias and no built-in thermal compensation. |
| UCC28911DR | 700V integrated MOSFET, primary-side sensing, constant-on-time control - no RREF/TC/VC pins; fixed 100kHz frequency. | Designed for universal AC input (85–265VAC); lacks boundary-mode flexibility and precision RREF reference. | Prefer for AC/DC offline flyback where high-voltage integration outweighs need for wide-input DC optimization and tight thermal regulation. |
Compared with LT3511EMS#TRPBF, LT3748IMS#TRPBF offers higher power capability but sacrifices integrated bias and temperature compensation, while UCC28911DR targets AC/DC rather than wide-range DC inputs and trades boundary-mode adaptability for fixed-frequency simplicity.
Availability
LT3511EMS#TRPBF is available at Aetrix Electronics and suitable for telecom auxiliary power, industrial housekeeping supplies, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed parametric performance over –40°C to 125°C.
Supply support for LT3511EMS#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for all LT parts including the LT3511 series.
The LT3511 belongs to Linear's high-voltage isolated power controller family, designed specifically for primary-side regulated flyback converters targeting space-constrained, reliability-critical applications in telecom, industrial, and automotive systems.
FAQ
What is the maximum isolated output power achievable with the LT3511EMS#TRPBF?
The LT3511EMS#TRPBF delivers up to 2.5W of isolated output power, verified across input ranges of 4.5V–100V and output voltages including 3.3V, 5V, 12V, and 24V. This limit is constrained by the 240mA/150V integrated switch and boundary-mode timing; actual power depends on transformer turns ratio, leakage inductance, and input voltage. For example, a 4:1 transformer yields ~1.6W at 72V input and ~1W at 36V input per Figure 2 in the LT3511 datasheet.
Does the LT3511EMS#TRPBF require an optocoupler or third winding for regulation?
No, the LT3511EMS#TRPBF does not require an optocoupler or third winding. It achieves regulation by sampling the reflected flyback voltage at the SW pin during secondary zero-current intervals, using the RFB and RREF resistors to scale the internal 1.2V bandgap reference. This primary-side sensing architecture eliminates optocoupler aging, nonlinearity, and unit-to-unit variation while reducing component count and board area.
How does the TC pin on the LT3511EMS#TRPBF improve output voltage accuracy over temperature?
The TC pin on the LT3511EMS#TRPBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node, compensating for the negative temperature coefficient of the output rectifier diode's forward voltage drop. By connecting a resistor from TC to ground, designers set the compensation slope to cancel VF drift - enabling ±1% output regulation over –40°C to 125°C without secondary sensing or trimming.
What is the function of the BIAS pin on the LT3511EMS#TRPBF, and how should it be decoupled?
The BIAS pin on the LT3511EMS#TRPBF provides a regulated ~3.1V supply for the internal switch driver and control circuitry. It must be bypassed with a minimum 4.7μF ceramic capacitor placed close to the pin. If VIN < 20V, BIAS may be tied directly to VIN; otherwise, a separate bias winding or LDO is required. Proper decoupling ensures stable gate drive and prevents erratic switching during transient loads.
Can the LT3511EMS#TRPBF operate in discontinuous conduction mode (DCM) at light loads?
Yes, the LT3511EMS#TRPBF transitions into discontinuous conduction mode (DCM) at light loads. When the VC pin voltage drops below 0.6V, the internal oscillator frequency decreases to as low as 40kHz, and the controller delays switch turn-on to maintain regulation. Unlike traditional flyback controllers, it continues sampling the flyback pulse during each DCM cycle to preserve output accuracy without secondary-side feedback components.
LT3511EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 240mA
- Frequency - Switching:
- 40kHz ~ 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3511EMS#TRPBF FAQ
1.How can I place an order for LT3511EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3511EMS#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 LT3511EMS#TRPBF reliable?
The price and inventory of LT3511EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3511EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3511EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3511EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3511EMS#TRPBF?
LT3511EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3511EMS#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 LT3511EMS#TRPBF?
For technical support, including LT3511EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3511EMS#TRPBF requirements.
6.How does Aetrix verify that LT3511EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3511EMS#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 LT3511EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3511EMS#TRPBF?
All LT3511EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3511EMS#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 LT3511EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3511EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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