Brushless DC Full-Bridge Motor Driver from Diodes Incorporated Provides PWM or DC-Voltage Speed Control

PLANO, Texas — (BUSINESS WIRE) — June 7, 2016 — Diodes Incorporated (Nasdaq: DIOD), a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets, today announced the AM9468 and AM9469. These brushless DC motor drivers feature a bridge-tied-load (BTL) drive architecture to minimize audible switching noise and electromagnetic interference (EMI), providing smart driving of cooling fans in notebook and desktop computers, instrumentation and similar equipment, as well as supporting a wide range of other medium-voltage, low-power, motor-driving applications.

Flexible motor speed control is achieved using either an external PWM signal or DC voltage, or a voltage derived from a thermistor network. The AM9468/AM9469 then adjust the duty cycle of the full-bridge output driver stage based on this input signal, while a separate frequency generator provides a tachometer output that allows for external monitoring of motor speed. The BTL architecture amplifies the sinusoidal magnetizing flux density signal used to drive the motor’s coils. This avoids large changes in current during commutation and helps achieve low noise operation. The speed control PWM duty cycle is superimposed on the BTL drive signal.

The AM9468/AM9469 feature a built-in quick-start circuit along with rotor lock detection. This protects the motor coil from overheating or burning out, but also ensures an automatic restart when the lock is removed. Other features include a current limit circuit and a Hall bias output, all contributing to a solution that significantly reduces the external component count and PCB footprint, and lowers component and manufacturing costs.

The AM9468 is available in a standard, power-capable TSSOP-16 package, while the AM9469 is offered in a thermally enhanced, exposed-paddle TSSOP-16EP package, which can source or sink output currents up to 700mA. Over-temperature protection is provided with a thermal shutdown circuit, a particularly valuable feature for protecting the enclosed coil and PCB of cooling fans found in thermally-demanding consumer applications. Both devices are specified for an operating temperature range from -40°C to 105°C.

For further information, visit the Company’s website at

About Diodes Incorporated

Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor’s SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logicanalog and mixed-signal semiconductor markets. Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets. Diodes’ products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers. Diodes’ corporate headquarters and Americas’ sales office are located in Plano, Texas and Milpitas, California. Design, marketing, and engineering centers are located in Plano; Milpitas; Taipei, Taiwan; Taoyuan City, Taiwan; Zhubei City, Taiwan; Manchester, England; and Neuhaus, Germany. Diodes’ wafer fabrication facilities are located in Kansas City, Missouri and Manchester, with an additional facility located in Shanghai, China. Diodes has assembly and test facilities located in Shanghai, Jinan, Chengdu, and Yangzhou, China, as well as in Hong Kong, Neuhaus and Taipei. Additional engineering, sales, warehouse, and logistics offices are located in Taipei; Hong Kong; Manchester; Shanghai; Shenzhen, China; Seongnam-si, South Korea; and Munich, Germany, with support offices throughout the world.

Recent news releases, annual reports and SEC filings are available at the Company’s website: Written requests may be sent directly to the Company, or they may be e-mailed to:


Company Contact:
Diodes Incorporated
Julie Holland, 972-987-3900
VP, Worldwide Analog Products
Email Contact
Investor Relations Contact:
Shelton Group
Leanne K. Sievers, 949-224-3874
EVP, Investor Relations
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