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AM4961A

Single Phase 12V BLDC Smart Fan and Motor Driver with enhanced FG and RD for reverse supply connection

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Description

The AM4961A is highly integrated feature rich single phase Brushless Direct Current (BLDC) full wave motor driver with PWM control function for fans, blowers and extractors.

For system flexibility the motor speed can be controlled by either an external PWM signal or by a DC voltage or from a Thermistor network. Based on the input signal, the AM4961A adjust the output duty cycle.

To help protect the motor coil, the AM4961A provides a rotor lock protection which shuts down the output if rotor lock is detected. The device automatically re-starts when the rotor lock is removed.

To help interface to external system for monitoring the motor status and speed, AM4961A provides open drain Rotor lock detect alarm output (RD) pin and a tachometer output Frequency Generator (FG). The FG output is the magnetic change frequency.

The AM4961A is available in SSOP-16 and HTSSOP-14 packages.

Feature(s)

Operating voltage : 3.5V to 16V
Internal H-Bridge with 1A Peak Current Capability
Speed Control with external PWM, DC or Thermistor signals
Minimal Speed Setting
Built-in Hall Bias Circuit
Reference Voltage Output
Rotor Lock Protection with Output Shutdown and Auto Restart
Rotation Speed Indication (FG)
Rotation or Lock State Indication (RD)
Built-in Thermal Shutdown Circuit
Industry standard SSOP-16 and Thermally Enhanced HTSSOP-14 Packages
Totally Lead-Free & Fully RoHS Compliant
Halogen and Antimony Free. “Green” Device

Application(s)

12V BLDC Cooling Fans, Motors, Extractors and Blowers
CPU Cooler Fan in PC
Instrumentation and Equipment Cooling fans
Brushless DC Motor Driver

Product Specifications

Product Parameters

Operating Voltage (V)	3.5 to 16 V
SupplyCurrent (mA)	8 mA
Average OutputDrive Current (mA)	- mA
Peak Output Current (mA)	1000 mA
Reference Voltage Output (V)	6 V
Hall Bias Voltage (V)	1.25 V
Speed Control	PWM or VDD
Speed Control Slope Adjust	-
Minimum Speed Setting	Yes
Lock Detect, Shut-Down and Auto Start	Yes
Frequency Generator (FG) and Rotation Detect	FG and RD RD
Other Protection Features	Over Current Limit Thermal Shutdown
Operating Ambient Temperature (°C)	-30 to 90 °C

Technical Documents

Recommended Soldering Techniques

TN1.pdf

Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2672	2024-03-11	2024-09-07	Device End of Life (EOL)