L4984DTR - Current-Mode CCM PFC Controller | STMicroelectronics
MPN: L4984DTR ✗ Cuối đờiL4984DTR Tóm tắt
A power-factor-correction controller is a specialized power-management IC that shapes input current drawn from an AC line. By commanding a switching converter at the proper timing, it reduces reactive current and improves the line power factor. The L4984D belongs to the PFC-controller hierarchy and supports boost-type front ends commonly placed ahead of downstream DC-DC converters in industrial, commercial, and consumer power supplies.
The supplied L4984D information identifies continuous-conduction operation, current-mode control, LM-FOT modulation, a 10.3 V to 22.5 V supply range, 1.1 V lockout, and approximately 5 mA operating current from distributor technical summaries. The 10-SSOP package supports compact surface-mount layouts. These values should be checked against the complete manufacturer datasheet before production release because the verified data does not include every timing, threshold, gate-drive, and protection parameter.
In a typical boost PFC stage, the controller senses inductor or input current and regulates the switching command so the input waveform is shaped toward unity power factor. LM-FOT control adapts the off-time to line conditions, while continuous-conduction mode favors lower current ripple than discontinuous operation. The external power stage, current-sense network, compensation components, and protection thresholds remain design-specific.
L4984DTR is suited to offline AC-DC front ends, server and telecom power systems, industrial power supplies, and consumer adapter designs when an active PFC stage is required. Designers must validate startup behavior, loop stability, inductor sizing, MOSFET selection, current-sense limits, and safety isolation under their operating line range.
The principal design consideration is that controller selection is only one part of PFC qualification. Check the exact STMicroelectronics datasheet and reference design for recommended gate-drive, compensation, sensing, and protection values. Confirm whether the 10-SSOP footprint, pin functions, voltage limits, and switching timing match the target PCB before committing to a drop-in replacement.
This page consolidates the verified L4984DTR product-page and distributor information, explicitly separates known values from unavailable data, and provides replacement guidance without presenting unverified substitutes as drop-in equivalents.
Bộ thay thế dễ dàng lắp đặt cho L4984DTR — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếL4984DTR Tỷ lệ tối đa & tính chất điện
| Product Type | Power Factor Correction Controller |
| Control Topology | Current-Mode PFC |
| Operating Mode | Continuous Conduction Mode (CCM) |
| Control Method | Line-Modulated Fixed-Off-Time (LM-FOT) |
| Supply Voltage Range | 10.3 V to 22.5 V |
| Lockout Voltage | 1.1 V |
| Startup Temperature | 65 °C |
| Operating Current | Approximately 5 mA |
| Hộp | 10-lead SSOP |
| Kiểu lắp đặt | Surface Mount |
| Application Category | Power Management |
| Input Power Factor | Active PFC; numerical power-factor specification not provided |
Hướng dẫn cấu hình chân L4984DTR 10-lead ssop
Cấu hình chân cho L4984DTR (10-lead ssop 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 L4984DTR.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
L4984DTR phù hợp cho 6 Áp dụngs: Server and Telecom AC-DC Front End, Industrial Power-Supply PFC Stage, Consumer Adapter and Charger Front End, Power-Factor-Corrected Bench Supply, Distributed Power Module, Telecom Rectifier Front End.
Server and Telecom AC-DC Front End
The L4984DTR is suitable as the control element for a mains-powered server or telecom AC-DC front end requiring active PFC. Its verified CCM current-mode architecture and LM-FOT control method support shaped input-current operation, while the 10.3 V to 22.5 V supply range must be derived from the appropriate auxiliary supply. The external boost MOSFET, inductor, rectifier, current-sense network, and compensation loop remain essential. Design validation should cover line regulation, inrush, startup, current limit, EMI, thermal behavior, and downstream converter stability across the complete line and load range.
Được đề xuất
Industrial Power-Supply PFC Stage
L4984DTR can serve as the PFC controller in an industrial power supply front end where reduced reactive current and improved input power factor are priorities. The verified continuous-conduction mode and LM-FOT architecture are relevant to boost PFC implementations, but the controller does not determine the final power rating by itself. Engineers must select the external inductor, MOSFET, rectifier, current-sense network, and compensation components for the required line, output, and thermal conditions. Industrial designs should also verify creepage, clearance, isolation, fault response, and environmental qualification independently.
Được đề xuất
Consumer Adapter and Charger Front End
The L4984DTR is applicable to a consumer adapter or charger AC-DC front end when active PFC is required by the input specification. Its 10.3 V to 22.5 V controller supply and 10-SSOP package are compatible with a compact surface-mount design, provided the external boost stage is correctly selected. The final design must account for universal-line requirements, inrush limiting, standby behavior, output-current regulation, isolation, and safety certification. Because the verified data does not include switching frequency, current-sense thresholds, or protection limits, those values must be taken directly from current manufacturer documentation.
Được đề xuất
Power-Factor-Corrected Bench Supply
L4984DTR can be evaluated in a laboratory or industrial bench-supply front end where input-current shaping and active PFC are required. The controller provides the PFC command function, while the power path and feedback network determine regulation quality and output capability. Engineers should prototype the boost stage, verify current-loop behavior with the intended inductor and capacitor, and measure harmonics, correction factor, startup behavior, and thermal rise at minimum and maximum line conditions. Use an isolated, current-limited test setup for AC-mains development and do not infer prototype limits from the controller supply range.
Được đề xuất
Distributed Power Module
L4984DTR can be evaluated for a distributed industrial power module that uses a corrected AC input stage before a downstream isolated converter. Its CCM current-mode PFC role and LM-FOT control are relevant to line-regulated boost conversion, while the compact 10-SSOP package supports board-level integration. The external components must be sized for the module's power level, ambient temperature, and required isolation. Designers should verify conducted emissions, differential-mode and common-mode noise, surge response, hold-up behavior, and fault recovery. The supplied data does not establish an automotive or safety qualification, so those requirements require separate verification.
Được đề xuất
Telecom Rectifier Front End
L4984DTR may be used in a telecom-style rectifier front end when the system requires active power-factor correction before a high-voltage DC bus. The verified LM-FOT control and CCM operation make the device a candidate for boost PFC development, but the complete converter must meet the telecom system's line regulation, current sharing, redundancy, and EMI expectations. External design work includes high-voltage component selection, current-sense isolation or attenuation, compensation, protection, and thermal management. Confirm the current lifecycle and all electrical limits with STMicroelectronics before committing to a production platform.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho L4984DTR — 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 |
|---|---|
| Package | 10-SSOP |
| Brand | STMicroelectronics |
| Product Type | PFC Controller |
| Control Topology | Current-Mode |
| Operating Mode | Continuous Conduction Mode (CCM) |
| Control Method | Line-Modulated Fixed-Off-Time (LM-FOT) |
| Supply Voltage | 10.3 V to 22.5 V |
| Lockout Voltage | 1.1 V |
| Operating Current | Approximately 5 mA |
| Startup Temperature | 65 °C |
Bảo phân biệt quan trọng
- Verified line-modulated fixed-off-time control method (vsGeneric CCM PFC controller)
- Verified continuous-conduction operating mode (vsGeneric DCM-capable PFC controller)
- Compact 10-SSOP package (vsLarger-package PFC controller)
Ghi chú thiết kế
Use the manufacturer L4984D package drawing and datasheet to place the SSOP-10 footprint, confirm pin numbering, and route the current-sense and gate-drive connections away from noisy power-switching nodes. The verified data establishes a 10-SSOP package but does not provide the pin table, so do not finalize copper or a replacement footprint from package name alone.
Design the external boost stage around the required line range and output power. The L4984DTR controller supply is verified as 10.3 V to 22.5 V, but that range is not the mains input range and does not specify the power-switch current limit. Verify the inductor saturation current, MOSFET voltage and current ratings, rectifier ratings, and current-sense limits using the manufacturer application information.
Estimate conduction and switching losses in the external MOSFET, inductor, rectifier, and current-sense network separately from controller dissipation. The verified snippets do not provide Rtheta-JA, switching frequency, gate charge, or thermal limits, so a numerical junction-temperature result cannot be claimed. Validate the assembled PFC stage at worst-case ambient, line, and load conditions with thermal-camera or thermocouple measurements.
A CCM PFC stage can generate significant switching ripple and conducted emissions. Keep the high-current loop compact, use low-inductance switching paths, provide deliberate current-loop and common-mode-noise return paths, and place input filtering and Y-capacitor arrangements only where safety requirements allow. Confirm EMI performance with the final magnetics, heatsink, chassis, and enclosure rather than relying on controller datasheet data alone.
Do not treat the 10.3 V to 22.5 V controller supply as the AC input voltage, and do not assume that any generic PFC controller is interchangeable. Verify startup thresholds, lockout behavior, current-sense polarity, protection response, compensation values, and pin assignments from current STMicroelectronics documentation before powering hardware.
Thông tin tuân thủ
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is marked not_applicable because no automotive qualification claim is present, not because the component is confirmed suitable or unsuitable for automotive use.
