BD7691FJ-E2 - 220kHz BCM PFC Controller | ROHM
MPN: BD7691FJ-E2 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.12 | $1.12 |
| 10 | $0.95 | $9.50 |
| 100 | $0.65 | $65.00 |
| 500 | $0.45 | $225.00 |
| 1,000 | $0.35 | $350.00 |
BD7691FJ-E2 Overview
A power-factor-correction controller is an AC/DC power-management IC that shapes switch-mode input current toward the input voltage. In the broader hierarchy, it belongs to switch-mode power controllers, power-management ICs, and semiconductors. BD7691FJ-E2 is intended for the front end of an AC/DC supply, where the upstream stage establishes power factor before energy is transferred to a downstream converter.
The principal verified features are 220 kHz switching, boundary-conduction mode, and resistance-based Zero Current Detection. BCM supports reduced switching loss and noise reduction according to the ROHM product material. The resistance-based detection method removes the auxiliary-winding requirement identified by ROHM, reducing circuit complexity compared with winding-based detection. The 8-SOP-J format supports conventional surface-mount PCB assembly.
The controller does not itself rectify the mains input or switch the power stage; it controls an external power MOSFET and boost-stage rectifier. Its control function depends on sensing the inductor and feedback conditions through an externally designed circuit. Component values for the inductor, MOSFET, current-sense network, capacitors, and compensation network must therefore be selected from the manufacturer application information rather than inferred from the distributor listing.
Typical applications are PFC front ends in AC/DC adapters, industrial power supplies, appliance power systems, and other switched-mode supplies whose input stage requires active power-factor correction. The controller is most relevant where a BCM implementation and resistance-based zero-current detection simplify the auxiliary circuit compared with winding-based solutions.
Designers must validate mains-side creepage, clearance, isolation, surge protection, loop layout, and safety limits in the complete power supply; package-level data alone does not establish regulatory compliance. Confirm the exact pin functions and ratings from the manufacturer datasheet before layout because the supplied search results do not expose a complete verified pin table. Pricing and technical data in this record are limited to the provided web sources as of 2026-10-21.
Drop-in alternatives for BD7691FJ-E2 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
BD7682FJ-LBE2
✅ Drop-In📋 Reference alternative (not in catalog)
BD7691FJ-E2 Maximum Ratings & Electrical Characteristics
| Product Type | Power Factor Correction Controller IC |
| Control Mode | Boundary Conduction Mode (BCM) |
| Switching Frequency | 220 kHz |
| Zero Current Detection | Resistance-based ZCD |
| Auxiliary Winding | Not required |
| Switching Loss Reduction | Supported by ZCD |
| Noise Reduction | Supported by ZCD |
| Input Conversion | AC input |
| Output Function | PFC stage control |
| External Switch | External power MOSFET required |
| Package | 8-SOP-J |
| Mounting Type | Surface Mount |
BD7691FJ-E2 8-sop-j Pin Configuration Guide
Pin configuration for BD7691FJ-E2 (8-sop-j 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 BD7691FJ-E2.
Refer to the datasheet for full pin configuration.
Typical Applications
BD7691FJ-E2 is suitable for 7 applications: AC/DC Adapter PFC Front End, Industrial Power Supply PFC Stage, Appliance Power Supply, High-Frequency Switch-Mode Supply, LED Power Supply, Server or Networking Power Supply, Power-Corrected Consumer Electronics Supply.
AC/DC Adapter PFC Front End
BD7691FJ-E2 is suited to an AC/DC adapter front end that needs active power-factor correction before the main conversion stage. Its 220 kHz BCM operation allows the inductor current to return toward zero near the switching transition, while resistance-based ZCD is intended to reduce switching loss and noise. The controller drives an external MOSFET and requires a separately designed boost inductor, rectifier, current-sense network, feedback path, capacitors, and protection. Compared with winding-based ZCD, the verified no-auxiliary-winding feature can reduce magnetic-component complexity, but the complete design still needs input-range, power-level, thermal, emissions, and safety validation.
Recommended
Industrial Power Supply PFC Stage
BD7691FJ-E2 can be used as the PFC controller in an industrial AC/DC power supply when the system requires a dedicated input-current shaping stage. Its 220 kHz switching point and boundary-conduction-mode operation are useful for designing a high-frequency boost PFC stage around external power semiconductors. Resistance-based Zero Current Detection avoids an auxiliary winding, which can simplify the magnetic layout and reduce the number of sensing connections. The design should still verify input surge, output-power capability, current ripple, switch dissipation, protective behavior, isolation, and conducted-emissions requirements because the supplied source data does not specify those application ratings.
Recommended
Appliance Power Supply
In appliance power supplies, BD7691FJ-E2 can serve as the active PFC controller for an upstream AC/DC stage. The 220 kHz BCM topology supports efficient power transfer while reducing switch transitions through zero-current detection. Because the resistance-based method does not require an auxiliary winding, the power stage can use a simpler sensing arrangement, which may be useful where transformer or inductor count must be controlled. It is essential to size the external switch, boost inductor, rectifier, current-sense resistor, and output capacitors for the appliance’s voltage range and load. Final compliance depends on the complete supply, not the controller alone.
Recommended
High-Frequency Switch-Mode Supply
BD7691FJ-E2 is applicable to high-frequency switch-mode supplies that include a PFC boost stage and require improved input power factor. Its 220 kHz operating frequency allows the designer to target compact magnetics and low-profile power conversion, while BCM operation supports reduced switching loss. The controller’s resistance-based ZCD is specifically described as eliminating the auxiliary winding, which can help reduce board complexity. The external power MOSFET and rectifier must have suitable voltage, current, switching-loss, and thermal ratings, and the inductor must meet ripple and saturation limits. These external-stage calculations cannot be completed from the supplied snippets alone.
Recommended
LED Power Supply
BD7691FJ-E2 can be considered for an LED power supply when the front end requires PFC and the downstream converter operates from a regulated boost output. The controller’s BCM operation and 220 kHz switching are intended to reduce switching loss and noise, while resistance-based ZCD avoids an auxiliary winding. The actual suitability depends on the LED driver’s input voltage, maximum output power, current ripple, startup behavior, and protection requirements. The BD7691FJ-E2 does not regulate the LED output by itself; it controls only the upstream PFC stage, so a separate converter and LED-current-control circuit are required.
Recommended
Server or Networking Power Supply
BD7691FJ-E2 may be used in server, telecom, or networking power-supply front ends where an AC input stage needs active power-factor correction. Its 220 kHz BCM architecture can help reduce switching loss and noise in a high-frequency boost PFC stage, while the resistance-based ZCD feature removes the need for an auxiliary winding. Suitability cannot be established from package or switching frequency alone: the complete system must meet its specified input range, power level, efficiency, inrush behavior, fault response, isolation, and safety requirements. Confirm those specifications in the manufacturer datasheet and application documentation before committing the part to a platform.
Recommended
Power-Corrected Consumer Electronics Supply
BD7691FJ-E2 can be used in consumer-electronics AC/DC adapters or offline power modules that benefit from active input power-factor correction. The controller’s BCM operation at 220 kHz targets lower switching loss and reduced noise, and resistance-based ZCD removes the auxiliary-winding requirement identified by ROHM. In a product design, the PFC stage must still be paired with a suitable switch, inductor, rectifier, feedback network, and downstream regulator. The controller does not provide galvanic isolation, output regulation, or complete protection by itself, so those functions must be implemented and validated elsewhere in the power supply.
Recommended
Recommended Products Summary
Engineering reference data for BD7691FJ-E2 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BD7682FJ-LBE2 |
|---|---|---|
| Package | 8-SOP-J | 8-SOP-J format indicated; verify exact package dimensions |
| Brand | ROHM Semiconductor | ROHM Semiconductor |
| Product Type | PFC Controller IC | PFC controller family comparison; details not supplied |
Key Differentiators
- Resistance-based Zero Current Detection avoids an auxiliary winding (vs BD7682FJ-LBE2)
- Verified 220 kHz operating point (vs BD7682FJ-LBE2)
- Boundary-conduction-mode PFC architecture (vs BD7682FJ-LBE2)
Design Notes
Treat BD7691FJ-E2 as a controller rather than the complete PFC power stage. Select an external MOSFET, boost rectifier, inductor, current-sense element, input and output capacitors, feedback network, and protection components using the manufacturer’s application guidance. Verify that the switch and rectifier withstand the maximum input voltage including surge, and that the inductor meets current ripple and saturation requirements. The supplied web data confirms BCM operation and 220 kHz switching but does not provide stage ratings for calculation.
Keep the PFC high-current loop compact and isolate the gate-drive path from sensitive feedback and current-sense routing. Place the controller’s decoupling capacitors close to its supply and ground pins, route the current-sense signal away from power-node transients, and use a low-inductance return path for the switching stage. Validate creepage, clearance, isolation, and surge requirements in the complete mains-side layout rather than relying on the 8-SOP-J package drawing alone.
Do not assume that the absence of an auxiliary winding eliminates current-sense or protection design work. Resistance-based ZCD still depends on correct sensing resistance, component tolerances, timing, and inductor behavior. Also do not treat BD7691FJ as proof that BD7691FJ-E2 is interchangeable in every package or ordering code. Confirm the exact pinout, electrical limits, lifecycle status, and production traceability from current ROHM documentation before release.
Compliance Information
The supplied manufacturer and distributor snippets do not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status. AEC-Q100 is marked not_applicable because no automotive qualification claim is provided; this is not an assertion that the part is unsuitable for automotive designs.
