AH286_10

AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Description The AH286 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. To help protect the motor coils, the AH286 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. A Rotor-lock Detect (RD) output flag allows external monitoring of any motor locks. The AH286 is available in SOT89-5L package. Pin Assignments (Top View) Vdd 1 2 286 5 RD GND DO 3 7 DOB 4 SOT89-5L Features • • • • • • • • • Single-chip solution Operating Voltage: 3.8V to 20V Built-in Hall sensor and input amplifier Rotor-lock Detect (RD) flag Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) Built-in Zener protection for output driver Average output current up to 500mA Packaged in SOT89-5L Green Molding Compound Applications • • Two-coil BLDC cooling fans Low to medium voltage, low power BLDC motors Typical Application Circuit Vdd (12V) D2 D1 R pu RD 5 4 286 1 2 3 Coil2 Coil1 D3 C3 GND R1 C1 R2 C2 12V DC Brush-Less Fan with RD Output Function Notes: 1. Typically it is recommended to us a 56 Ohm resistor for R1 and R2 and a 2.2μF E-Cap capacitor for C1, C2 and C3. These values may need to be optimized depending on the coils used. To help with IC protection it’s advised to add a Zener diode between Vdd and ground. The Zener diode should be chosen to help prevent the supply voltage exceeding the maximum rating of the device. 1 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 Document number: DS31030 Rev. 12 - 2 AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Pin Descriptions Pin Name RD Vdd DO DOB GND Description Rotor-state detection Input power Output pin Output pin Ground Functional Block Diagram Vdd Lock detect, shutdown and automatic re-start Regulator DO Hall Plate Amp. Control Logic DOB GND RD AH286 Document number: DS31030 Rev. 12 - 2 2 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Absolute Maximum Ratings (TA = 25°C) Symbol Vdd IO PD TST TJ θJA Supply Voltage Output Current Power Dissipation Storage Temperature Maximum Junction Temperature Thermal Resistance Junction to Case (Note 2) TA TJ Tc Characteristics IO (AVE) IO (PEAK) Rating 24 500 700 800 -55 ~ 150 150 156 Unit V mA mA mW °C °C °C/W θ JA θ JC Notes: 2. θJA should be confirmed with heat sink thermal resistance. If there is no heat sink contact, θJA will almost be the same as θJC.. Recommended Operating Conditions Symbol Vdd TA Characteristic Supply Voltage Operating Ambient Temperature Conditions Operating Operating Min 3.8 -40 Max 20 100 Unit V °C AH286 Document number: DS31030 Rev. 12 - 2 3 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Electrical Characteristics (TA = 25 °C, Vdd = 12V, unless otherwise specified) Symbol Idd IOFF TRLP-ON TRLP-OFF VOUT(SAT) RDS(ON) VOL Vz Characteristics Supply Current Output Leakage Current Rotor Lock Protection On Time Rotor Lock Protection Off Time Output Saturation Voltage Output On Resistance RD Output Vds Output Zener-Breakdown Voltage IO = 300mA IO = 500mA IO = 300mA IO = 10mA Conditions Operating VOUT = 24V Min 0.4 2.4 35 Typ. 2.0 < 0.1 0.5 3 375 625 1.25 0.5 42 Max 4.0 10 0.6 3.6 500 900 1.67 60 Unit mA μA Sec Sec mV ohm V V Truth Table (Note 3) ININ+ H L L H Notes: CT L L H OUT1 H L off OUT2 L H off RD L L H Mode Rotating Rotating Lockup protection activated 3. Latch-type RD output is low during rotor rotation and high when the rotor is locked (not rotating) Magnetic Characteristics (TA = 25 °C, Vdd = 12V, unless otherwise specified, Note 4) (1mT = 10 Gauss) Symbol Bop Brp Bhy Notes: Characteristics Operate Point Release Point Hysteresis Min 10 -60 - Typ. 30 -30 60 Max 60 -10 - Unit Gauss Gauss Gauss 4. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering. AH286 Document number: DS31030 Rev. 12 - 2 4 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Operating Characteristics DOB DO Output Voltage in Volts RP 12 10 8 6 4 Output Voltage in Volts OFF OFF 12 10 8 6 4 OP ON 2 OP Vsat RP 2 ON Vsat Brp 0 Bop Brp 0 Bop Magnetic Flux Density in Gauss Magnetic Flux Density in Gauss S Marking side N ( SOT89-5L ) AH286 Document number: DS31030 Rev. 12 - 2 5 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Performance Characteristics TA (°C) PD (mW) TA (°C) PD (mW) 25 800 105 288 50 640 110 256 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 P D ( mW ) 900 800 700 600 500 400 300 200 100 0 -4 0 0 25 P ower Dissipation Curve 50 75 10 0 125 1 50 T A ( °C) AH286 Document number: DS31030 Rev. 12 - 2 6 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information AH 286 - Y G - 13 Package Y : SOT89-5L Green G : Green (Note 5) Packing 13 : Tape & Reel Device AH286-YG-13 Notes: Package Code Y Packaging (Note 6, 7) SOT89-5L Bulk Part Number Quantity Suffix NA NA 13” Tape and Reel Part Number Quantity Suffix 2500/Tape & Reel -13 5. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 6. 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. 7. Reverse taping as shown on Diodes Inc. Surface Mount (SMD) Packaging document AP02007, which can be found on our website http://www.diodes.com/datasheets/ap02007.pdf. Marking Information (Top View) 5 4 7 286 Y W X 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 1 2 SOT89-5L 3 AH286 Document number: DS31030 Rev. 12 - 2 7 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm) Sensor Location AH286 Document number: DS31030 Rev. 12 - 2 8 of 9 www.diodes.com June 2010 © Diodes Incorporated AH286 HALL-EFFECT 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). 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