AH5795

Datasheet

AH5795
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Description

The AH5795 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. Motor speed can be controlled by either changing the duty ratio of the PWM signal at the PWM pin or by varying the supply voltage at Vdd pin. To help protect the motor coil, the AH5795 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. The AH5795 is available in space saving and low profile TSOT26 and DFN2020C-6 packages.

Features and Benefits

• Supports single-coil full-wave BLDC fan drivers
• Built-in Hall sensor and input amplifier
• Operating voltage: 1.8V to 6V
• Speed control methods
o Vdd voltage speed control (PWM pin tied to Vdd)
o PWM signal speed control via PWM pin
• Soft switching for low noise DC fan motor applications
• Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)
• Toff clear when PWM is low for greater than 65ms
• Thermal protection
• Tachometer (FG) output
• No external timing capacitor - Reduces the numbers of external components required
• Low profile package: TSOT26 and U-DFN2020-6 Type C
• “Green” Molding Compound (No Br, Sb)

Applications

• 3V / 3.3V / 5V Small cooling fans
• Notebook/Netbook and Desktop fans
• Low voltage/low power BLDC motors

Part Number	AH5795
Output	H-Bridge
Description	Single Phase Low Voltage 500mA All-In-One Motor and Fan Driver with PWM Speed Control
Operating Voltage V	1.8 to 6.0
Output Current Ave	500mA 300mA
Operating Point Bop Gauss	10/50
Release Point Brp Gauss	-50/10
Operating Ambient Temperature Range °C	-40 to +105

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