Maker : Diodes Incorporated
Part No. : AH5798

Datasheet PDF : AH5798.pdf
Cross Reference : AH5798 Cross Reference
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Product Information

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 capacitor C1 between Vdd and Vss terminal, to make the path of return current to power supply. The AH5798 has an open-drain tachometer FG output that follows the magnetic change frequency. A pull-up resistor (10Kohm, typically for System Power = 5V) connected to a supply voltage. AH5798 Rev. 1 1 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Ordering Information AH 5798 - XX G - 13 Package Y : SOT89-5L Green Packing 13 : Tape & Reel 13” Tape and Reel Part Number Suffix Quantity 2500/Tape & Reel -13 G : Green Packaging (Note 2) SOT89-5L Device AH5798-YG-13 Notes: Package Code Y 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Pin Assignments (1) SOT89-5L ( Top View ) Vdd 1 Vss 2 5 FG NC 7 O2 4 www.DataSheet4U.com O1 3 Pin Descriptions Pin Name Vdd Vss O1 O2 NC FG Notes: Description Power supply pin Ground pin Output driving & sinking pin 1 Output driving & sinking Pin 2 No Connection Frequency Generator (Note 3) 3. The FG is the same as the magnetic change frequency. AH5798 Rev. 1 2 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Block Diagram Vdd Power Frequency Generator FG O1 Hall Sensor AMP Logic Block Lock Detector Soft Switching Control Full Bridge Driver O2 Vss Operating Magentic S N www.DataSheet4U.com O2 O1 FG Normal spinning Ton Toff Mechanical lock “Re-start spinning” motor locked cleared motor locked detected Notes: 4. In “Normal spinning, the FG shall change its state at each rising edge of O1. 5. When magnetic is locked as “S” pole, then O2 is kept on “L”, O1 is a clock w...

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