AOZ7111AI - 350kHz CRM PFC Controller | Alpha & Omega Semiconductor
MPN: AOZ7111AI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.3126 | $0.31 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
AOZ7111AI Overview
A power-factor-correction controller is a power-management IC that regulates the relationship between AC input voltage and current at the supply input. In a boost PFC stage, the controller drives an external switching MOSFET and works with the inductor, capacitor, rectifier, sensing network, and feedback loop to reduce input-current distortion and improve power factor. CRM operation places the switching cycle at critical conduction, using variable-frequency control rather than relying on a fixed-frequency pulse-width modulation scheme.
The AOZ7111AI’s headline verified specifications are its 350 kHz maximum operating frequency, 9.5 V to 12 V UVLO range, and SO-8 package. It has no integrated MOSFET according to the retrieved technical data, so the switching device is external to the controller. This separation allows the power stage to be selected for the required voltage, current, switching loss, and thermal conditions rather than being fixed by the controller package.
The controller is intended for offline power supplies and industrial AC-DC conversion systems where PFC is required. The CRM control architecture can reduce conduction and switching losses compared with some fixed-frequency boost approaches, although inductor ripple, EMI behavior, input-current distortion, and loop stability still require application-specific validation. The manufacturer datasheet should be consulted for startup behavior, current-sense thresholds, gate-drive limits, protection features, and recommended compensation.
The principal design consideration is ensuring that the external MOSFET, inductor, current-sense network, and feedback components are compatible with the AOZ7111AI’s 350 kHz operating point. Keep the power loop compact, route high-current paths carefully, and provide filtering that addresses both conducted emissions and the switching noise generated by the boost stage. Do not infer unreported electrical limits from distributor summaries.
This page combines the verified distributor and manufacturer-family references with practical engineering guidance. It also records the absence of a verified drop-in substitute set, avoiding unsupported alternatives and preserving the distinction between a genuine pin-compatible replacement and a merely similar PFC controller.
Drop-in alternatives for AOZ7111AI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AOZ7111AI (same form factor and footprint) — differing in Package, Product Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesAOZ7111AI Maximum Ratings & Electrical Characteristics
| Product Type | Active PFC controller |
| Control Topology | Critical conduction mode (CRM) |
| Maximum Operating Frequency | 350 kHz |
| Integrated MOSFET | No |
| UVLO Range | 9.5 V to 12 V |
| Power-Stage Configuration | External-MOSFET boost PFC |
| Input Function | AC power-factor correction |
| Package | SO-8 |
| Package Pin Count | 8 pins |
| Operating Temperature | -40 C to +125 C |
| Mounting Type | Surface mount |
| Manufacturer | Alpha & Omega Semiconductor |
| Datasheet Family | AOZ7111 |
| RoHS Status | unknown |
| Application Category | AC-DC converter and offline switcher |
AOZ7111AI 8 pins Pin Configuration Guide
Pin configuration for AOZ7111AI (8 pins package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for AOZ7111AI.
Refer to the datasheet for full pin configuration.
Typical Applications
AOZ7111AI is suitable for 6 applications: Industrial AC-DC Boost PFC Front End, Offline Power Supply with Active Power Factor Correction, High-Power LED Power Supply, Server or Data-Center Power Supply Front End, Industrial Motor-Control Power Bus, Renewable-Energy Input Conditioning.
Industrial AC-DC Boost PFC Front End
AOZ7111AI fits an industrial AC-DC front end when the design requires active input-current shaping with an external MOSFET. Its verified 350 kHz maximum operating frequency and CRM control architecture provide a starting point for a compact boost PFC stage, while the -40 C to +125 C rating supports evaluation across a broad temperature range. The external MOSFET, inductor, current-sense network, rectifier, capacitor, and feedback loop must be co-designed. Validate line regulation, power factor, harmonic behavior, startup, protection, and thermal performance at the intended operating limits.
Offline Power Supply with Active Power Factor Correction
AOZ7111AI is applicable to an offline power supply that needs a dedicated PFC stage ahead of a downstream DC-DC converter. In this arrangement, the controller operates with an external MOSFET in a boost topology rather than switching the high-power stage internally. CRM control can help reduce losses relative to some conventional boost-control methods, but the actual benefit depends on inductor selection, conduction path, switching frequency, and line/load range. Validate the power factor, input-current distortion, output bus stability, and standby behavior in the complete supply.
High-Power LED Power Supply
AOZ7111AI can be evaluated in a high-power LED supply that combines PFC regulation with a downstream LED driver. The PFC stage helps reduce input-current distortion and improve the upstream power factor, while the external MOSFET allows the switching device to be selected for the LED supply’s voltage and current requirements. The 350 kHz maximum operating frequency and CRM topology should be checked against inductor size, switching loss, EMI requirements, and thermal limits. Validate dimming behavior, standby, fault response, and conducted emissions with the complete converter.
Server or Data-Center Power Supply Front End
AOZ7111AI may be considered for a server or data-center power-supply front end where active PFC is required before a high-voltage DC bus feeds downstream converters. The external-MOSFET architecture provides flexibility for a power stage designed around the required output level and load current. However, the supplied data does not confirm specific data-center certifications, isolation ratings, or efficiency targets. Those requirements must be verified independently through the complete power-supply design and applicable safety and EMC testing.
Industrial Motor-Control Power Bus
AOZ7111AI can be used as part of an industrial power-conversion system that needs a shaped input current and regulated boost bus before motor-control circuitry. The controller’s external-MOSFET arrangement lets the designer select a switching device suitable for the bus voltage, current, and thermal environment, while CRM operation addresses the boost-stage control requirements. In a motor application, hold-up capacitors, inrush current, regeneration behavior, and fault transients must be considered. Validate the PFC stage separately from the motor inverter because motor-load dynamics can expose stability and recovery issues.
Renewable-Energy Input Conditioning
AOZ7111AI may be evaluated in renewable-energy input conditioning or inverter-support circuits where an AC input bus benefits from active power-factor correction. The controller is a PFC building block rather than a complete inverter, so it requires external power-stage components and system-level protection. Check the input voltage range, surge exposure, grounding, isolation, EMI behavior, and environmental requirements against the final installation. The verified data does not establish renewable-energy certification, so it should not be treated as a qualified grid-interface component without separate evidence.
Engineering reference data for AOZ7111AI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Product Type | CRM PFC controller |
| Brand | Alpha & Omega Semiconductor |
| Package | SO-8 |
| Maximum Operating Frequency | 350 kHz |
| UVLO Range | 9.5 V to 12 V |
| Integrated MOSFET | No |
| Operating Temperature | -40 C to +125 C |
| Power-Stage Configuration | External-MOSFET boost PFC |
| RoHS Status | unknown |
Key Differentiators
- External-MOSFET architecture (vs No verified drop-in alternative MPN)
- CRM boost-PFC positioning (vs Generic fixed-frequency PFC controllers)
- Compact 8-pin controller package (vs No verified cross-brand substitute)
Design Notes
Treat the AOZ7111AI as a controller rather than the complete boost stage. Select the external MOSFET for the bus voltage, current, switching loss, and thermal conditions, and verify its SOA at the actual operating points. The supplied data does not provide AOZ7111AI gate-drive or current-sense limits, so do not finalize those values from the distributor summary alone; use the official datasheet and validate the complete power path.
Place the MOSFET, inductor, current-sense element, and power capacitor to minimize the high-current switching loop. Keep the controller’s sensitive feedback and sense traces away from the switch node, use a compact ground strategy, and route high-current paths with short, wide conductors. The 350 kHz figure is a maximum operating-frequency reference, not a layout instruction; optimize the loop and filtering for the actual switching waveform and EMI limits.
Thermal design must include the external MOSFET, inductor, rectifier, capacitor ESR, controller, and ambient enclosure conditions. The verified AOZ7111AI temperature range is -40 C to +125 C, but that does not determine the allowable power loss of the assembled PFC stage. Estimate junction and component temperatures at maximum line, maximum load, and worst-case ambient, then verify them with thermal simulation and temperature-rise testing.
Compliance Information
The supplied results do not provide verified RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification documentation. AEC-Q100 is not applicable based on the supplied data because no automotive qualification is stated.
