Diodes Incorporated AH5775-P-B

Overview

AH5775-P-B from Diodes Incorporated is a single-phase BLDC motor driver IC with integrated Hall-effect latch sensor, full-bridge output stage (RON_TOTAL ≤ 2.41 Ω at 12V), soft-switching control, and rotor lock protection. It operates from 2.5V to 18V supply, delivers up to 300 mA continuous output current, and targets low-noise cooling fan applications in notebooks and instrumentation.

For engineers reviewing the AH5775-P-B datasheet, AH5775-P-B pinout, AH5775-P-B application, or AH5775-P-B equivalent, key selection criteria include integrated Hall sensing capability, TO94 package thermal performance (θJA = 86.3 °C/W), overvoltage shutdown threshold (19–23 V), thermal shutdown at +170 °C, and rotor lock detection with automatic restart behavior.

Technical Context

The AH5775 implements a closed-loop commutation controller for single-coil BLDC motors using an on-die Hall-effect sensor with BOP/BRP of ±70 G typical and 140 G hysteresis. Its soft-switching logic modulates H-bridge turn-on/off timing (TSW = 200 μs typ.) to suppress EMI and audible noise during coil current reversal.

Power management includes three independent protection mechanisms: overvoltage shutdown (VOV_TH = 19–23 V), thermal shutdown (TJ_SDN_TH = +170 °C, hysteresis = +25 °C), and rotor lock detection (TON = 420 ms lock-to-shutdown delay). All protections trigger output disable and automatic recovery upon fault clearance.

Key Specifications

Pinout & Package

The AH5775-P-B is housed in an industry-standard through-hole TO94 package (14.5 mm × 3.65 mm × 1.56 mm), optimized for thermal dissipation on 2-layer PCBs (PD = 1500 mW at TA = 25 °C, θJA = 86.3 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase BLDC motor driver applications.

Compared with ZXBM5212 and DRV10970, the AH5775-P-B uniquely integrates Hall sensing, soft switching, and rotor lock auto-restart in a TO94 package-enabling minimal-component, low-noise fan control without firmware or external timing components.

Availability

AH5775-P-B is available at Aetrix Electronics and suitable for 5V/12V cooling fans, notebook/desktop thermal management, and instruments cooling fans requiring stable component supply and long-term manufacturability.

Supply support for AH5775-P-B 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 analog ICs, specializing in power management, signal integrity, and motor control solutions for industrial, computing, and consumer markets.

The AH5775 belongs to Diodes' BLDC motor driver product line, engineered specifically for cost-sensitive, low-noise, single-phase fan applications where integration of Hall sensing and protection features reduces system-level complexity.

FAQ

What is the maximum continuous motor current supported by the AH5775-P-B?

The AH5775-P-B supports 300 mA continuous output current per channel under recommended operating conditions (TA ≤ +105 °C, VDD = 12 V). Peak current capability reaches 800 mA for short durations, but sustained operation above 300 mA requires careful thermal design due to its 1500 mW power dissipation limit in TO94 packaging.

Does the AH5775-P-B require an external timing capacitor for rotor lock detection?

No. The AH5775-P-B implements internal timing for rotor lock detection with a fixed 420 ms timeout (TON), eliminating the need for external capacitors. This simplifies layout, improves reliability, and ensures consistent lock-detection behavior across temperature and voltage variations without component tolerance drift.

How does the AH5775-P-B respond to overvoltage conditions?

When supply voltage exceeds the overvoltage threshold (19–23 V), the AH5775-P-B immediately disables all H-bridge outputs and enters standby mode. It remains in standby until VDD drops below the release threshold (18–22 V), then automatically resumes normal operation-preventing coil insulation stress and enabling graceful recovery without host intervention.

Can the AH5775-P-B drive motors powered from 3 V supplies?

Yes. The AH5775-P-B operates down to 2.5 V, supporting 3 V-powered low-voltage BLDC motors. At 3 V, output high voltage is VDD − 0.31 V (min), low voltage is 0.15 V (max), and total RDSON rises to 2.45 Ω (typ.), resulting in higher conduction loss-but remains functional for sub-1 W motor loads with appropriate thermal management.