AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Description Pin Assignments The AH284 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. (Top View) (Top View) 284 Vdd 1 GND 2 1 : Vdd 2 : DO To help protect the motor coils, the AH284 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. 3 : DOB 5 NC 284 DO 3 74 DOB 4 : GND 1 2 3 4 SOT89-5L SIP-4L The AH284 is available in SIP4 and SOT89-5L packages. Features Applications • • • • • • • • • • Single-chip solution Operating Voltage: 3.8V to 20V Built-in Hall sensor and input amplifier Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) Built-in Zener protection for output driver Average output current up to 500mA Packages: SIP-4L and SOT89-5L Green Molding Compound Two-coil BLDC cooling fans Low to medium voltage, low power BLDC motors Typical Application Circuit (Note 1) 12V D2 Vdd D1 284 1 2 3 L2 L1 R1 R2 C1 C2 4 GND D3 DOB C3 DO 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. AH284 Document number: DS31051 Rev. 11 - 2 1 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Pin Descriptions Pin Name Description Vdd Input Power DO Output Pin DOB Output Pin GND Ground NC Not Connected Functional Block Diagram Vdd Lock detect, shutdown and automatic re-start Regulator DO Hall Plate Amp. Control Logic DOB GND AH284 Document number: DS31051 Rev. 11 - 2 2 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Absolute Maximum Ratings (TA = 25°C) Symbol Characteristics Vdd Supply Voltage IO Output Current SIP-4L SOT89-5L IO (AVE) IO (PEAK) SIP-4L SOT89-5L PD Power Dissipation TST TJ Storage Temperature Maximum Junction Temperature θJA Thermal Resistance Junction to Case (Note 2) SIP-4L SOT89-5L Rating Unit 24 500 500 700 550 800 -55 ~ 150 150 V mA mA mA mW mW °C °C 227 156 °C/W °C/W TA TJ Tc 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 AH284 Document number: DS31051 Rev. 11 - 2 Conditions Min Max Unit Operating Operating 3.8 -40 20 100 V °C 3 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Electrical Characteristics (TA = 25 °C, Vdd = 12V, unless otherwise specified) Symbol Idd IOFF Characteristics Conditions TRLP-ON TRLP-OFF Supply Current Output Leakage Current Rotor Lock Protection On Time Rotor Lock Protection Off Time VOUT(SAT) Output Saturation Voltage RDS(ON) VZ Output On Resistance Output Zener-Breakdown Voltage Operating VOUT = 24V IO = 300mA IO = 500mA IO = 300mA Min Typ. Max Unit 0.4 2.4 35 2.0 < 0.1 0.5 3 375 625 1.25 42 4.0 10 0.6 3.6 500 900 1.67 60 mA μA Sec Sec mV ohm V Truth Table IN- IN+ CT OUT1 OUT2 Mode H L - L H - L L H H L off L H off Rotating Rotating Lockup protection activated Magnetic Characteristics (TA = 25 °C, Vdd = 12V, unless otherwise specified, Note 3) (1mT = 10 Gauss) Symbol Bop Brp Bhy Notes: Characteristics Operation Point Release Point Hysteresis Min Typ. Max Unit 10 -60 - 30 -30 60 60 -10 - Gauss Gauss Gauss 3. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering. AH284 Document number: DS31051 Rev. 11 - 2 4 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Operating Characteristics DO 12 RP Output Voltage in Volts Output Voltage in Volts DOB OFF 10 8 6 4 2 ON OP 0 4 2 RP ON 0 Bop Magnetic Flux Density in Gauss S S Marking side Marking side N Document number: DS31051 Rev. 11 - 2 6 Brp Magnetic Flux Density in Gauss AH284 8 Bop ( SIP-4L ) OP 10 VSAT VSAT Brp 12 OFF N ( SOT89-5L ) 5 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Performance Characteristics (1) SIP-4L TA (°C) PD (mW) TA (°C) PD (mW) 25 550 105 198 50 440 110 176 P D (mW ) 60 396 115 154 70 352 120 132 80 308 125 110 85 286 130 88 90 264 135 66 95 242 140 44 100 220 150 0 Pow er D iss ipation Curv e 6 00 5 00 4 00 3 00 2 00 1 00 0 0 25 (2) SOT89-5L TA (°C) PD (mW) TA (°C) PD (mW) 25 800 105 288 50 50 640 110 256 P D (mW ) 60 576 115 224 75 70 512 120 192 75 480 125 160 10 0 80 448 130 128 125 85 416 135 96 90 384 140 64 15 0 T A (°C ) 95 352 145 32 100 320 150 0 Power Dissipation Curve 900 800 700 600 500 400 300 200 100 0 -4 00 25 50 75 10 0 125 1 50 T A (°C) AH284 Document number: DS31051 Rev. 11 - 2 6 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Ordering Information AH 284 - X G - X Device AH284-PG-B AH284-YG-13 Notes: Package Green Packing P : SIP-4L Y : SOT89-5L G : Green (Note 4) B : Bulk 13 : Tape & Reel Package Code Packaging (Note 5, 6) P Y SIP-4L SOT89-5L Bulk Part Number Quantity Suffix 1000 -B NA NA 13” Tape and Reel Part Number Quantity Suffix NA NA 2500/Tape & Reel -13 4. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html. 5. 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. 6. 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 (1) SIP-4L ( Top View ) Part Number Y : Year : 0~9 WW : Week : 01~52, "52" represents 52 and 53 week X : Internal Code : A~Z : Green 284 Y WW X (2) SOT89-5L ( Top View ) 4 7 5 284 Y W X 1 AH284 Document number: DS31051 Rev. 11 - 2 2 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 3 7 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm) (1) Package type: SIP-4L Marking side 1.95士0.1mm 1.1士0.1mm 1 0.7 mm 2 3 4 Sensor Location Active Area Depth Package Dimension AH284 Document number: DS31051 Rev. 11 - 2 8 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 HALL-EFFECT SMART FAN MOTOR CONTROLLER Package Outline Dimensions (Continued) (2) Package type: SOT89-5L Sensor Location AH284 Document number: DS31051 Rev. 11 - 2 9 of 10 www.diodes.com June 2010 © Diodes Incorporated AH284 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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