AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER General Description 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) 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 10Kohm SYSTEM POWER Vdd FG FG D1 C1 Dz 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 Device Package Code AH5798-YG-13 Notes: Y Green Packing G : Green 13 : Tape & Reel 13” Tape and Reel Part Number Suffix Quantity Packaging (Note 2) SOT89-5L 2500/Tape & Reel -13 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 5 FG 2 NC O1 3 74 O2 Vss 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 FG Power Frequency Generator O1 Hall Sensor AMP Logic Block Soft Switching Control Full Bridge Driver O2 Lock Detector Vss Operating Magentic S N O2 O1 Ton FG Normal spinning Toff Mechanical lock motor locked detected Notes: “Re-start spinning” motor locked cleared 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 with Ton/Toff ratio. When magnetic is locked at “N” pole, then O1 is kept on “L”, O2 is a clock with Ton/Toff ratio. 6. When “Re-start spinning” occurs, the motor shall ramp up to the “Normal Spinning” speed from zero. It depends on the motor characteristics. AH5798 Rev. 1 3 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Soft Switching AH5798 is with soft switching of the bidirectional current through the single motor coil is important for low noise applications. Vdd Vout 1 Vout 2 GND 100µs typ. Absolute Maximum Ratings Symbol Vdd IO(PEAK) PD TST (Unless otherwise noted, at TA= 25°C) Characteristics Supply voltage Maximum Output Current (Peak) Power Dissipation Storage Temperature Range SOT89-5L Recommended Operating Conditions Symbol TA Vdd Values Unit 6 800 800 -65 ~ 150 V mA mW o C Unit (TA = 25°C) Parameter Conditions Rating Operating Ambient Temperature Range Supply Voltage Operating Operating -40 ~ 105 1.8~5.5 AH5798 Rev. 1 4 of 9 www.diodes.com o C V OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Electrical Characteristics Symbol Idd VOH VOL TSW ILEAK VFGOL TON RDR (TA = 25°C, Vdd = 5V ) Characteristics Conditions Supply Current Output Voltage High Output Voltage Low Output Switching Slope Duration FG Output Leakage Current FG Output Voltage Low On Time Duty Ratio Magnetic Characteristics No Load IOUT = 300mA IOUT = 300mA 50Ω load on out1/out2 IFG = 5mA TOFF / TON Min Typ. Max Unit 4.4 350 - 5 4.65 0.35 100 500 10 0.6 5 0.4 650 - mA V V μs μA V ms (TA=25°C, Vdd=1.8V~5V, Note 7) (1mT = 10 G) Symbol Notes: Characteristic Min Typ. Max Unit Bop Operate Point 10 25 50 G Brp Release Point -50 -25 -10 G Bhy Hysteresis - 50 - G 7. Magnetic characteristics are for design information, which will vary with supply voltage, operating temperature and after soldering. AH5798 Rev. 1 5 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Operating Characteristics O1 O2 VOH RP OFF ON OP Output Voltage in Volts Output Voltage in Volts VOH VOL Brp 0 OFF OP RP ON VOL Bop Brp Magnetic Flux Density in Gauss 0 Bop Magnetic Flux Density in Gauss S Marking side N (SOT89-5L) AH5798 Rev. 1 6 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Performance Characteristics (1) SOT89-5L TA (°C) PD (mW) TA (°C) PD (mW) 25 800 105 288 50 640 110 256 P D (m W ) 60 576 115 224 70 512 120 192 75 480 125 160 80 448 130 128 85 416 135 96 90 384 140 64 95 352 145 32 100 320 150 0 Pow er D issipation C urve 900 800 700 600 500 400 300 200 100 0 -400 25 50 75 10 0 105 125 1 50 T A (°C ) Marking Information (1) SOT89-5L ( Top View ) 4 7 5 XX Y W X 1 Device AH5798 AH5798 Rev. 1 2 3 Package SOT89-5L 7 of 9 www.diodes.com XX : Identification code Y : Year : 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : Internal code A~Z : Green Identification Code K4 OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Package Information (All Dimensions in mm) (1) Package type: SOT89-5L Sensor Location AH5798 Rev. 1 8 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application. Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks. LIFE SUPPORT Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein: A. Life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems. Copyright © 2009, Diodes Incorporated www.diodes.com AH5798 Rev. 1 9 of 9 www.diodes.com OCTOBER 2009 © Diodes Incorporated