Diodes Incorporated
U DFN2020 6 Type F

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U-DFN2020-6-Type-F.png
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AH5795 (Not Recommended for new design)

NRND = Not Recommended for New Design

Low Noise Single Phase 3V/5V BLDC All-In-One Fan and Motor Driver with Low Rdson Softswitch PWM Speed Control and Thermal Shutdown and Standby Mode

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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 control°C 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.

Feature(s)

  • Supports single-coil full-wave BLDC fan drivers
  • Built-in Hall sensor and input amplifier
  • Operating voltage: 1.8V to 6V
  • Speed control methods - Vdd voltage speed control (PWM pin tied to Vdd) - 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: TSOT23-6 and DFN2020C-6
  • “Green” Molding Compound (No Br, Sb)
  • Application(s)

  • 3.3V / 5V BLDC Cooling Fans
  • Netbook/ Notebook BLDC fans
  • Instruments cooling fans
  • Low Voltage/ Low Power BLDC Motors
  • Product Specifications

    Product Parameters

    Average OutputDrive Current (mA) 300, 500
    Frequency Generator (FG) and Rotation Detect FG
    Lock Detect, Shut-Down and Auto Start Yes
    Operating Ambient Temperature (°C) -40 to 105
    Operating Point Bop Gauss (Max) 50
    Operating Point Bop Gauss (Min) 10
    Operating Point Bop Gauss (Typ) -
    Operating Voltage (V) -
    Peak Output Current (mA) 1000
    Release Point Brp Gauss (Max) -10
    Release Point Brp Gauss (Min) -50
    Release Point Brp Gauss (Typ) -25
    Soft-Switch Yes
    Speed Control VDD PWM
    SupplyCurrent (mA) 1.8
    Typical Total RDS(ON)(NMOS and PMOS Combined) 1 @ 5V

    Related Content

    Packages

    Technical Documents

    Recommended Soldering Techniques

    TN1.pdf

    RoHS CofC

    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-2594 2022-08-31 2023-02-28 Device End of Life (EOL)