Diodes Incorporated AP3927DS7-13

Overview

AP3927DS7-13 from Diodes Incorporated is a monolithic AC-DC offline regulator integrating a 700V power MOSFET and controller in SO-7 (Type B) package, designed for non-isolated buck/buck-boost topologies in IoT and home appliance power supplies. It delivers 360mA typical output current, supports universal 85–277VAC input, operates at 33kHz fixed frequency under heavy load and switches to PFM mode at light load, and achieves <20mW no-load power consumption.

For engineers reviewing the AP3927DS7-13 datasheet, AP3927DS7-13 pinout, AP3927DS7-13 application, or AP3927DS7-13 equivalent, key selection criteria include integrated 700V MOSFET capability, ±5% constant voltage regulation accuracy, audible-noise-free PFM operation, SO-7 (Type B) thermal performance (θJA = 58°C/W), and direct feedback compatibility with high-side buck configurations.

Technical Context

The AP3927DS7-13 implements a high-voltage startup circuit with programmable VBP hysteresis (600mV) and dual-stage soft-start (64-cycle stages at 0.25×/0.5× fOSC before full 33kHz operation). Its internal current sense uses leading-edge blanking (250ns standard, 200ns for SCP) and compares peak current against a 650mA typical limit referenced to VLIMIT.

Feedback is implemented via direct sampling through C5 and resistor divider (R1/R2), enabling high-side buck operation without optocoupler isolation. Open-loop detection triggers shutdown if FB drops below 100mV, while OLP activates after 200ms delay when VFB falls below 1.4V - both mechanisms enforce hiccup-mode recovery with 2.8s off-time and 200ms hold time.

Key Specifications

Pinout & Package

AP3927DS7-13 is housed in an SO-7 (Type B) surface-mount package with exposed thermal pad (mechanical weight: 0.077g; moisture sensitivity level: MSL3 per J-STD-020). The package features 7 terminals arranged in single-row configuration with 1.27mm pitch and 0.72mm lead length.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC-DC offline regulator applications.

Compared with AP3926DS7-13, AP3927DS7-13 adds 200V MOSFET headroom and EMI dithering for global 277VAC compatibility; versus LNK3206P, it trades isolation for 40% lower system cost and 30% smaller footprint in non-isolated use cases.

Availability

AP3927DS7-13 is available at Aetrix Electronics and suitable for IoT sensor power supplies, non-isolated home appliance controls, and industrial auxiliary rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for AP3927DS7-13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP3927D belongs to Diodes' high-voltage AC-DC regulator product line, engineered specifically for cost-sensitive, non-isolated buck/buck-boost power conversion in smart home and IoT edge devices.

FAQ

What topology configurations does AP3927DS7-13 support?

AP3927DS7-13 supports non-isolated buck, boost, and buck-boost topologies using a single-winding inductor. It implements high-side buck with direct feedback via C5 sampling capacitor and resistor divider (R1/R2), eliminating optocouplers and transformers. The device is not suitable for flyback or forward topologies requiring galvanic isolation.

How does AP3927DS7-13 achieve <20mW no-load power consumption?

It combines three design elements: (1) PFM mode operation at light/no load with sub-1kHz minimum frequency, (2) auxiliary VBP supply via resistor R5 from output to bypass capacitor, reducing HV startup current draw, and (3) quiescent VBP current of 245–354µA at 25°C. These features collectively suppress idle losses without compromising startup reliability.

Can AP3927DS7-13 be used in automotive applications?

No - AP3927DS7-13 is not qualified to AEC-Q100 or IATF 16949 standards. Diodes explicitly states that automotive-grade versions require separate qualification, PPAP capability, and manufacturing in certified facilities. This part is intended for industrial, consumer, and IoT applications with ambient temperature range –40°C to +125°C, not automotive under-hood environments.

What is the purpose of the four S pins (pins 4–7) in SO-7 (Type B) package?

The four paralleled S pins serve as the integrated MOSFET's source terminal and provide low-impedance grounding for both power switching and control circuitry. They reduce effective source resistance, improve thermal conduction to the PCB ground plane, and minimize voltage spikes during high di/dt switching - critical for stable current sensing and EMI performance in high-voltage buck applications.