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AH5798

Diodes Incorporated
Part Number AH5798
Manufacturer Diodes Incorporated
Description SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER
Published Feb 8, 2010
Detailed Description AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Features • • • • • • • • • • • Support single-phase fu...
Datasheet PDF File AH5798 PDF File

AH5798
AH5798

Overview
AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Features • • • • • • • • • • • Support single-phase full wave DC fan driver Built-in Hall sensor input amplifier Low voltage startup ( Vdd=1.
8V ) Lock detection and automatic self-restart Soft switching for low noise DC fans Without external timing capacitor, Reduces the numbers of external component required Thermal protection FG output Low profile package: SOT89-5L SOT89-5L: Available in “Green” Molding Compound (No Br, Sb) Lead Free Finish/ RoHS Compliant (Note 1) General Description The AH5798 is a single chip solution for driving single-coil brush-less DC fans and motors.
The AH5798 employs a bidirectional full bridge driver output stage for single coil fan motor applications.
The soft switching driver generates the low noise operating for DC fans.
The device includes features such as Rotor Lock Protection with rotor lock detection and automatic self-restart to avoid damage to the coil when the rotor is blocked.
The AH5798 also offers an externally controlled Tachometer (Frequency Generator Pin) open -drain output which makes it easier to connect with external interface such as hardware monitoring.
The FG is the magnetic change frequency.
The device is packaged in SOT89-5L for SMT applications in DC fans.
Applications • • • 3.
3V / 5V Min.
BLDC Cooling Fans Net-Book/ Note-Book DC fans Low Voltage/ Low Power BLDC Motors Typical Application Circuit SYSTEM POWER www.
DataSheet4U.
com SYSTEM POWER Vdd D1 C1 Dz FG 10Kohm FG AH5798 O1 O2 V SS * Reverse connection of power supply may break the device.
A countermeasure is needed such as using reverse power protection diode D1 between power supply and Vdd terminal.
In such case of using reverse power protection diode D1 because of there is no way to return current to power supply, please take necessary measures like below.
- Connect Dz (Zener diode) between Vdd and Vss terminal, not to exceed the absolute maximum rating voltage.
- Connect a capacit...


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