AH5798-WTG-7

AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Description The AH5798 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. To help protect the motor coil, the AH5798 provides Rotor Lock Protection which shuts down output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. The AH5798 is available in space saving SOT89-5L and thinner TSOT25 packages. Pin Assignments ( Top View ) Vdd 1 Vss 2 5 FG NC 7 O2 4 O1 3 SOT89-5L ( Top View) FG Vss O2 1 2 3 4 5 Vdd O1 Features TSOT25 • • • • • • • • • • Supports single-coil full-wave DC fan drivers Built-in Hall sensor and input amplifier Operating Voltage: 1.8V to 5.5V Soft switching for low noise DC fan motor applications Rotor Lock Protection (Lock detection, output shutdown and automatic re-start) Thermal protection Tachometer (FG) output No external timing capacitor - Reduces the numbers of external components required Low profile packages: SOT89-5L and TSOT25 “Green” Molding Compound Applications • • • 3.3V / 5V Min. BLDC Cooling Fans Netbook/ Notebook BLDC fans Low Voltage/ Low Power BLDC Motors AH5798 Document number: DS32001 Rev. 2 - 2 1 of 11 www.diodes.com June 2010 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Typical Application Circuit SYSTEM POWER 10Kohm SYSTEM POWER Vdd D1 C1 Dz FG FG AH5798 O1 O2 V SS * Reverse connection of power supply may damage the device. To prevent reverse power damage, a protection (reverse blocking) Diode D1 is needed between power supply and Vdd terminal. If a reverse power protection diode D1 is used, there is no current return path to power supply, so it is necessary to follow measures such as below. - Connect Dz (Zener diode) between Vdd and Vss terminal, to prevent voltage exceeding the absolute maximum rating of the device. - Connect a capacitor C1 between Vdd and Vss terminal, to complete the current return path to power supply. The AH5798 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically, a pull-up resistor of 10kΩ is recommended from FG pin to the supply voltage. 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 1) 1. The FG is the same as the magnetic change frequency. AH5798 Document number: DS32001 Rev. 2 - 2 2 of 11 www.diodes.com June 2010 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Functional Block Diagram Vdd Power Frequency Generator FG O1 Hall Sensor AMP Control Logic Soft Switching Control Full Bridge Driver O2 Vss Lock detect, Shoutdown and Automatic re-start Operating Magentic S N O2 O1 FG Normal spinning Ton Toff Mechanical lock “Re-start spinning” motor locked cleared motor locked detected Notes: 2. In “Normal spinning”, the FG changes its state at each rising edge of O1. 3. When the motor locks with South pole at the Hall element, O2 is kept on “L” and O1 is a clock with Ton/Toff ratio. When motor locks with North pole at the Hall element, O1 is kept on “L”, O2 is a clock with Ton/Toff ratio. 4. When “Re-start spinning” occurs, the motor speed ramps up to the “Normal Spinning” speed from zero. Speed ramp-up profile depends on motor characteristics. AH5798 Document number: DS32001 Rev. 2 - 2 3 of 11 www.diodes.com June 2010 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Soft Switching AH5798 employs soft switching of output drive at commutation to reduce audible noise and EMI for low noise applications. Vdd Vout 1 Vout 2 GND 100µs typ. Absolute Maximum Ratings (TA = 25°C, unless otherwise noted) Symbol Vdd IO(PEAK) PD TST Parameter Supply voltage Maximum Output Current (Peak) Power Dissipation Storage Temperature Range Thermal Resistance Junction-to-Ambient (Note 5) TA TJ Tc SOT89-5L TSOT25 SOT89-5L TSOT25 θJA Rating 6 800 800 520 -65 ~ 150 156 240 Unit V mA mW mW o C o C/W o C/W θ JA θ JC Notes: 5. 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 (TA = 25°C) Symbol Vdd TA AH5798 Document number: DS32001 Rev. 2 - 2 Parameter Supply Voltage Operating Ambient Temperature Range Conditions Operating Operating Min 1.8 -40 Max 5.5 105 Unit °C V June 2010 © Diodes Incorporated 4 of 11 www.diodes.com AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Electrical Characteristics (TA = 25°C, Vdd = 5V) Symbol Parameter Test Conditions Min Typ. Max Unit Idd VOH VOL TSW ILEAK VFGOL TON RDR Supply Current Output Voltage High Output Voltage Low Output Switching Slope Duration FG Output Leakage Current FG Output Voltage Low On Time Duty Ratio No Load IOUT = 300mA IOUT = 300mA 50Ω load on out1/out2 IFG = 5mA TOFF / TON 4.4 350 - 5 4.65 0.35 100 500 10 0.6 5 0.4 650 - mA V V μs μA V ms Magnetic Characteristics (TA = 25°C, Vdd = 1.8V~5V, Note 6) (1mT = 10 G) Max Unit 50 -10 G G G Symbol Bop Brp Bhy Notes: Parameter Min 10 -50 - Typ. 25 -25 50 Operate Point Release Point Hysteresis 6. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering. AH5798 Document number: DS32001 Rev. 2 - 2 5 of 11 www.diodes.com June 2010 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Operating Characteristics O1 VOH Output Voltage in Volts RP OFF Output Voltage in Volts OFF OP O2 VOH ON OP VOL Brp 0 Bop RP VOL Brp 0 Bop ON Magnetic Flux Density in Gauss Magnetic Flux Density in Gauss S Marking side N Marking side N (SOT89-5L) S (TSOT25) AH5798 Document number: DS32001 Rev. 2 - 2 6 of 11 www.diodes.com June 2010 © 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 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 (m W ) 900 800 700 600 500 400 300 200 100 0 -40 0 25 P ow er D iss ipation C urve 50 75 10 0 105 125 1 50 T A ( °C ) (2) TSOT25 TA (°C) PD (mW) TA (°C) PD (mW) 25 520 105 188 50 417 110 167 60 375 115 146 70 333 120 125 75 313 125 104 80 292 130 83 85 271 135 63 90 250 140 42 95 230 145 21 100 208 150 0 P D (m W ) 60 0 52 0 50 0 40 0 30 0 20 0 10 0 0 -40 0 25 P ow er Diss ipation C urv e 50 75 10 0 1 05 12 5 150 T A ( °C) AH5798 Document number: DS32001 Rev. 2 - 2 7 of 11 www.diodes.com June 2010 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Ordering Information AH 5798 - XX G - X Package Y : SOT89-5L WT : TSOT25 Device AH5798-YG-13 AH5798-WTG-7 Notes: Green Packing 7/13 : Tape & Reel G : Green Package Code Y WT Packaging (Note 7 & 8) SOT89-5L TSOT25 7”/13” Tape and Reel Quantity Part Number Suffix 2500/Tape & Reel -13 3000/Tape & Reel -7 7. 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 8. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html Marking Information (1) SOT89-5L (Top View) 5 4 7 XX Y W X 1 2 3 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 Part Number AH5798-YG (2) TSOT25 Package SOT89-5L (Top View) 5 4 7 XX Y W X 1 2 3 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 : A~Z : Green Package TSOT25 Identification Code K4 June 2010 © Diodes Incorporated Part Number AH5798-WTG AH5798 Document number: DS32001 Rev. 2 - 2 8 of 11 www.diodes.com AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Package Outline Dimensions (All Dimensions in mm) (1) Package type: SOT89-5L Sensor Location AH5798 Document number: DS32001 Rev. 2 - 2 9 of 11 www.diodes.com June 2010 © Diodes Incorporated AH5798 SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER Package Outline Dimensions (Continued) (2) Package type: TSOT25 Sensor Location AH5798 Document number: DS32001 Rev. 2 - 2 10 of 11 www.diodes.com June 2010 © 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). 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