MC33368D - High-Voltage Critical Conduction PFC | onsemi
MPN: MC33368D ✓ Hoạt độngMC33368D Tóm tắt
A power-factor controller is a power-management IC that shapes input current to improve the real-power factor of AC-to-DC equipment. In the broader hierarchy, the MC33368D belongs to the PFC controller class, then power-management ICs, and ultimately semiconductor devices used in offline power conversion. CRM operation reduces the switching loss associated with continuously conducting current and is commonly considered for compact power supplies where component count and thermal performance are important.
The MC33368D family is intended for boost preconverter front ends used ahead of downstream DC-DC converters. Its narrow-body SOIC package helps reduce board area, while the CRM control approach supports low-power, high-density power-supply implementations. The available evidence confirms the 16-SOIC package, critical-conduction operation, boost PFC function, high-voltage application class, and the manufacturer’s GreenLine positioning. Exact input-voltage, switching-frequency, current-limit, timing, and electrical-limit values were not included in the supplied verified excerpts and are therefore not inferred here.
Typical applications are off-line power supplies, compact AC-to-DC adapters, industrial power-conversion equipment, and consumer electronics with an upstream PFC stage. In these systems, the controller drives the boost switching element while external circuitry handles current sensing, voltage feedback, rectification, filtering, and protection. The MC33368D can help reduce conducted emissions and improve input-current quality when the complete PFC loop is designed and compensated correctly.
The main design consideration is that PFC performance depends on the surrounding converter, not only on the controller IC. Inductor selection, current-sense network, switch and diode ratings, safety spacing, feedback compensation, EMI filtering, and thermal design must be validated together. The narrow SOIC-16 footprint helps layout density, but high-voltage offline designs still require careful creepage, clearance, isolation, and safety-capacitor placement.
This product page synthesizes verified manufacturer and distributor information, package identity, application context, engineering design notes, and honest sourcing limitations for MC33368D. Because the supplied data does not include a confirmed drop-in substitute, no replacement MPN is presented as drop-in compatible.
Bộ thay thế dễ dàng lắp đặt cho MC33368D — 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 thếMC33368D Tỷ lệ tối đa & tính chất điện
| Product Type | High-voltage GreenLine power factor controller |
| Control Topology | Critical-conduction mode (CRM) |
| Converter Role | Boost preconverter |
| Application Class | Off-line power supplies |
| Hộp | 16-pin narrow-body SOIC |
| Package Family | SOIC, surface-mount package |
| Kiểu lắp đặt | Surface mount |
| Số chân | 16 pins |
| Design Objective | Low power, high-density power supply |
| Board-Space Objective | Minimum board area |
| Component-Count Objective | Reduced component count |
| Power-Dissipation Objective | Low power dissipation |
| Input Power-Factor Function | Active power factor correction |
| Switching Mode | Critical-conduction boost operation |
| Manufacturer | onsemi |
Hướng dẫn cấu hình chân MC33368D soic, surface-mount package
Cấu hình chân cho MC33368D (soic, surface-mount package 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 MC33368D.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
MC33368D phù hợp cho 6 Áp dụngs: Compact Off-Line AC-to-DC Power Supply, Industrial Power Conversion, Consumer Electronics Power Adapter, High-Density Power-Supply Module, LED Power-Supply Front End, Renewable-Energy and Storage Interface.
Compact Off-Line AC-to-DC Power Supply
The MC33368D fits an upstream boost PFC stage in a compact off-line power supply because the verified onsemi description identifies it as a critical-conduction-mode controller for boost preconverter applications. Place it after the input rectifier and ahead of the downstream DC-to-DC stage, with external MOSFET, diode, inductor, sensing, feedback, and filtering networks. The CRM approach is intended to help reduce board area, component count, and power dissipation, but actual efficiency and power factor depend on the complete converter and compensation design.
Được đề xuất
Industrial Power Conversion
MC33368D can be used where an industrial power converter requires active input-current shaping before its main DC bus. Its verified boost-PFC role supports a front end that corrects current from a rectified industrial input while a downstream converter establishes the regulated output. Designers must select the external inductor and semiconductor ratings for the input range, validate current-sense limits, and maintain high-voltage clearances. The supplied evidence does not provide industrial qualification, so the final product must be assessed for its actual environmental requirements.
Được đề xuất
Consumer Electronics Power Adapter
For a consumer-electronics adapter, the MC33368D is suited to the PFC front end when the product requires improved input-current quality and reduced conducted emissions. The controller can drive a boost preconverter after rectification, allowing the main converter to receive a more favorable input waveform. A successful design must account for standby behavior, inrush, overvoltage, overcurrent, short-circuit protection, and the enclosure’s thermal conditions. The manufacturer’s narrow 16-SOIC package helps minimize footprint, but safety certification remains a system requirement.
Được đề xuất
High-Density Power-Supply Module
The MC33368D is appropriate for a high-density power module where minimizing board area and component count is central to the mechanical design. Its critical-conduction boost PFC architecture can reduce conduction duration compared with designs that maintain continuous current, while the narrow SOIC-16 package preserves routing space around the power stage. The tradeoff is that CRM design requires careful inductor sizing, frequency behavior, control-loop compensation, and EMI validation. Thermal performance must be evaluated from the complete converter rather than from the controller package alone.
Được đề xuất
LED Power-Supply Front End
The MC33368D can serve as the PFC controller in an LED power-supply front end when the LED driver is fed from a boosted DC bus. The active PFC function helps shape current before the downstream LED driver regulates output current or voltage. The external boost stage must be sized for the LED driver’s maximum power and transient response, while current-sense and voltage-feedback networks must remain noise-resistant. The supplied data does not identify an LED-specific reference circuit, so this application requires validation against the complete onsemi datasheet and target driver requirements.
Được đề xuất
Renewable-Energy and Storage Interface
MC33368D may be considered for the AC-facing PFC stage of an energy-storage or renewable-power interface when the system requires a corrected input current before conversion. Its boost preconverter role is compatible in principle with systems that use a downstream isolated or non-isolated DC converter. The controller is not a battery charger or storage controller by itself. Designers must define the input range, power rating, isolation boundary, protection strategy, and applicable safety requirements before integrating it into storage equipment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC33368D — 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 |
|---|---|
| Product Type | High-voltage critical-conduction PFC controller |
| Control Mode | Critical-conduction mode (CRM) |
| Power-Stage Role | Boost preconverter |
| Input Class | Off-line rectified AC application |
| Package | 16-pin narrow-body SOIC |
| Brand | onsemi |
| Board-Space Objective | Minimum board area |
| Component-Count Objective | Reduced component count |
| Power-Dissipation Objective | Low power dissipation |
| Pin Count | 16 pins |
Bảo phân biệt quan trọng
- CRM boost PFC positioning (vsNo confirmed substitute in the supplied cross-reference data)
- High-density package objective (vsNo confirmed substitute in the supplied cross-reference data)
- Low component-count orientation (vsNo confirmed substitute in the supplied cross-reference data)
Ghi chú thiết kế
Place the MC33368D, current-sense components, and feedback components so that high dv/dt switching-node energy is not coupled into the control signals. Keep the boost-switch current loop compact and route the high-current power paths away from sensitive analog traces. Use the manufacturer’s recommended layout and verify creepage, clearance, and isolation requirements for the actual off-line voltage and applicable safety standard.
The MC33368D controls a boost PFC stage rather than supplying output power itself. Select the external MOSFET, boost diode, inductor, capacitors, and current-sense network for the input range, target power, switching behavior, and fault conditions. Do not infer a power rating from the controller MPN alone; calculate the stage from the complete datasheet limits and validate thermal margin with the assembled enclosure.
CRM operation can reduce some conduction losses, but conducted and radiated emissions still depend on switching-node dv/dt, common-mode paths, input-filter design, loop area, and shield or enclosure construction. Use an input EMI filter and snubber strategy only after measurements or validated reference design guidance. Incorrect compensation or overly aggressive filtering can increase controller stress or destabilize the PFC loop.
Avoid treating a functionally similar PFC IC as a drop-in substitute. Verify every pin, current-sense polarity, high-voltage rating, startup behavior, fault response, compensation range, and package footprint against the original design. The supplied cross-reference search did not identify a confirmed MC33368D replacement, so any substitution requires a deliberate engineering review and board-level qualification.
Thông tin tuân thủ
The supplied verified data does not state MC33368D compliance status. Do not infer RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals compliance from the manufacturer name or distributor listings.
