LT3748EMS#PBF - 100V Isolated Flyback Controller | Analog Devices
MPN: LT3748EMS#PBF ✓ Hoạt độngLT3748EMS#PBF Tóm tắt
A flyback controller is a switching-regulator controller that uses an energy-storage transformer to transfer power across an isolation barrier. The LT3748EMS#PBF belongs to the DC-DC converter and isolated power-supply hierarchy, combining high-voltage input capability, boundary-mode control, and external power-stage design flexibility. Its isolation-capable architecture is useful where the output must be electrically separated from the input source.
Key verified features include a 5V to 100V input operating range, a 100V isolated flyback-controller rating, boundary-mode operation, low-side external N-MOSFET drive, internally regulated 7V gate-drive supply, and load regulation of ±5% over the specified line, load, and temperature ranges. The 16-MSOP package supports compact isolated power modules while leaving the MOSFET and transformer selection to the designer.
The LT3748 is intended for isolated auxiliary supplies, industrial equipment, telecom power systems, data-acquisition equipment, instrumentation, and high-voltage DC-DC converters. The boundary-mode approach can reduce transformer size while maintaining load regulation, but final efficiency, isolation, voltage accuracy, and thermal performance depend on the external transformer, MOSFET, compensation, layout, and output components.
Designers should select an external MOSFET with adequate voltage and current ratings, verify transformer isolation and saturation margins, and keep high-current switching loops compact. The controller’s 100V input capability does not remove the need for surge protection, input filtering, creepage, clearance, and safety validation in the completed isolated converter. This page summarizes verified source information and clearly identifies specifications that require additional data.
Bộ thay thế dễ dàng lắp đặt cho LT3748EMS#PBF — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
LT3748HMS#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LT3748IMS#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LT3748EMS#TRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LT3748EMS#PBF-T
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LT3748HMS#TRPBF
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LT3748EMS#PBF Tỷ lệ tối đa & tính chất điện
| Product Type | 100V isolated flyback controller IC |
| Phạm vi điện áp đầu vào | 5V to 100V |
| Maximum Input Voltage | 100V |
| Switching Topology | Isolated flyback |
| Control Method | Boundary mode |
| Cấu hình đầu ra | Isolated step-up/step-down capable |
| External Power Stage | Low-side external N-channel MOSFET |
| Internal Gate-Drive Supply | 7V regulated |
| Load Regulation | ±5% over full line, load, and temperature ranges |
| Hộp | 16-MSOP |
| Kiểu lắp đặt | Surface mount |
| Isolation Capability | Isolation-capable isolated flyback controller |
| Operating Mode | Boundary mode |
| Load Power Capability | Several tens of watts with suitable external MOSFET and transformer |
| Manufacturer Product Status | Production |
| Tần số chuyển đổi | Set by load current and transformer magnetizing inductance |
| Số lượng đầu ra | 1 isolated output |
Hướng dẫn cấu hình chân LT3748EMS#PBF 16-msop
Cấu hình chân cho LT3748EMS#PBF (16-msop gói). Động cơ điện này có chân cổng, nguồn và đầu ra. Đối với các gói không phân極, tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết hướng dẫn chính xác của chân 1 và chi tiết về vân footprint. Các ứng dụng phổ biến bao gồm thiết kế nguồn cung cấp điện, điều khiển động cơ và chuyển đổi tải.
Không có dữ liệu chân cụ thể sẵn có cho LT3748EMS#PBF.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LT3748EMS#PBF phù hợp cho 6 Áp dụngs: Isolated Industrial Auxiliary Supply, High-Voltage DC-DC Converter, Telecom Power System, Instrumentation and Test Equipment, Data Acquisition and Sensor Gateway, Isolated Gate-Drive or Bias Supply.
Isolated Industrial Auxiliary Supply
The LT3748EMS#PBF fits isolated auxiliary supplies in industrial equipment because it accepts 5V to 100V and uses an isolated flyback topology to transfer power across a safety barrier. Place the controller with a suitably rated external N-channel MOSFET and transformer, then regulate the isolated output through the transformer and feedback network. Its boundary-mode operation lets the switching frequency depend on load current and transformer magnetizing inductance, helping reduce magnetic size while maintaining the manufacturer-stated ±5% load regulation. The design must be checked for worst-case surge voltage, insulation, creepage, clearance, thermal rise, and isolation withstand.
Được đề xuất
High-Voltage DC-DC Converter
Use LT3748EMS#PBF as the control element in a high-input-voltage isolated DC-DC converter when the source may operate near the controller’s 100V capability. Its low-side external N-MOSFET drive and boundary-mode control provide a compact solution for power levels of several tens of watts when the passive and semiconductor design is appropriate. The external MOSFET must withstand the worst-case input voltage plus switching transients, while the transformer must satisfy turns ratio, magnetizing inductance, saturation, leakage-inductance, and isolation requirements. Final regulation and efficiency depend on those choices rather than on the controller alone.
Được đề xuất
Telecom Power System
The LT3748EMS#PBF is applicable to telecom-style isolated power modules where a 48V-class nominal input may be used with a higher transient voltage and where galvanic isolation is required. The 5V to 100V controller range provides design margin over a nominal telecom bus, but the completed converter still needs input surge suppression, reverse-polarity protection as required, filtering, and safety-qualified isolation. Boundary-mode operation supports a small transformer solution, and the external MOSFET allows the switching device to be selected for the module’s power and thermal requirements.
Được đề xuất
Instrumentation and Test Equipment
The LT3748EMS#PBF can generate an isolated auxiliary rail for instrumentation, measurement front ends, and test equipment that require a clean separation from a high-voltage input. The isolated flyback architecture avoids sharing the output return with the primary side, while boundary-mode control helps keep the magnetic solution compact. Design the transformer for the target isolation voltage and working voltage, maintain the required clearance and creepage across the barrier, and verify that feedback components and output capacitors meet the required ripple and transient response. The controller is suitable only when the external power stage is designed for the specified environment.
Được đề xuất
Data Acquisition and Sensor Gateway
An LT3748EMS#PBF-based isolated flyback converter can supply a local isolated rail for data-acquisition equipment, sensor gateways, and field-installed electronics. Its high-input-voltage capability is useful when the converter is fed from a long industrial wiring system where transients are possible. The controller’s external MOSFET and transformer arrangement permits optimization for a required isolated output power of several tens of watts, but the engineering must include input protection, common-mode considerations, galvanic isolation, thermal design, and tested surge immunity. Boundary-mode frequency variation should be checked across the complete line and load range.
Được đề xuất
Isolated Gate-Drive or Bias Supply
The LT3748EMS#PBF can be used in isolated gate-drive or bias-supply subsystems when the target circuit requires a secondary-side supply separated from a high-voltage primary. The controller drives a low-side external N-channel MOSFET from an internally regulated 7V supply, allowing the power stage to be selected for the required isolation and output levels. Because the device is a flyback controller, the transformer turns ratio and feedback network determine the output voltage, while leakage inductance and clamping components influence EMI and switch stress. Validate the design for dielectric withstand, partial-discharge, temperature, and creepage requirements applicable to the target system.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LT3748EMS#PBF — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LT3748HMS#PBF | LT3748IMS#PBF | LT3748EMS#TRPBF | LT3748EMS#PBF-T | LT3748HMS#TRPBF |
|---|---|---|---|---|---|---|
| Package | 16-MSOP | MSOP-16 | MSOP-16 | MSOP-16 | MSOP-16 | MSOP-16 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
Bảo phân biệt quan trọng
- High-input-voltage isolated flyback control (vsLT3748HMS#PBF)
- Boundary-mode operation (vsLT3748IMS#PBF)
- External power-stage flexibility (vsLT3748EMS#TRPBF)
Ghi chú thiết kế
The LT3748EMS#PBF is a controller, not a complete power stage. Select the external N-channel MOSFET for the worst-case input voltage, switching transients, output current, RDS(on), gate charge, avalanche behavior, and thermal rise. Verify the transformer turns ratio and magnetizing inductance against the intended output voltage and power level. Estimated system power cannot be calculated from the controller alone; use the manufacturer application guidance and test the selected transformer, MOSFET, clamp, rectifier, and output network together.
Keep the primary-side switching loop compact by placing the input capacitor, controller, external MOSFET, and transformer primary in the smallest practical loop. Route the gate trace with low parasitic inductance and avoid long shared paths. Keep feedback and compensation nodes away from the drain, switch node, and transformer leakage field. Respect the isolation barrier with verified creepage, clearance, insulation, and component-height rules; a layout that meets low-voltage switching performance may still fail high-voltage isolation requirements.
Do not assume that a related LT3748 ordering suffix is automatically a drop-in replacement. Confirm the exact package drawing, pin names, exposed connections, electrical limits, and ordering code against the current Analog Devices datasheet. Also do not interpret the 100V controller rating as complete 100V system qualification. Add appropriate input surge and transient protection, transformer insulation verification, output filtering, and prototype testing across line, load, and temperature conditions.
Thông tin tuân thủ
The supplied verified snippets identify the manufacturer, package, topology, voltage range, production status, and product information, but they do not explicitly provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. Verify current compliance documents from Analog Devices before release to manufacturing.
