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AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 1 of 13 www.diodes.com march 2012 ? diodes incorporated new product description the AH5794 is a single chip solution for driving single-coil brushless direct current (bldc) fans and motors. the integrated full-bridge driver out put stage uses soft switching to minimize audible switching noise and electromagnetic interference (emi) providing a low noise solution. low operating voltage down to 1.8v allows motor speed to be controlled by varying the supply voltage. to help protect the motor coil, the AH5794 provides rotor lock protection which shuts down the output drive if rotor lock is detected. the device automatic ally re-starts when the rotor lock is removed. over temperature shutdown provides thermal protection for the device. a tachometer output is provid ed by open-drain frequency generator (fg) pin which allows external interface to monitor motor rotation or speed. t he fg output is the magnetic change frequency. the AH5794 is available in space saving and low profile tsot26 and u-dfn2020c-6 packages. features ? supports single-coil full-wave bldc fan drivers ? built-in hall sensor and input amplifier ? operating voltage: 1.8v to 6v ? v dd voltage speed control ? 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 package: tsot26 and u-dfn2020c-6 ? halogen and antimony free ?green? packages. ? lead free finish/ rohs compliant pin assignments applications ? 3v/ 3.3v/ 5v bldc cooling fans ? netbook/ notebook bldc fans ? instruments cooling fans ? low voltage/ low power bldc motors tsot26 (top view) 1 2 3 6 5 4 nc fg v ss o2 v dd o1 u-dfn2020c-6 (top view) fg nc 1 2 3 6 5 4 o2 v ss v dd o1
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 2 of 13 www.diodes.com march 2012 ? diodes incorporated new product typical application circuit pin descriptions pin name description v dd power supply pin v ss ground pin o1 output driving & sinking pin o2 output driving & sinking pin nc no connection fg frequency generator (note 1) notes: 1. the fg output is the same as the magnetic change frequency.
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 3 of 13 www.diodes.com march 2012 ? diodes incorporated new product functional block diagram (note 2) notes: 2.the AH5794 has an open-drain tachometer fg output that follows the magnetic change frequency. typically a pull-up resi stor of 10k ? is recommended from fg pin to the supply voltage.
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 4 of 13 www.diodes.com march 2012 ? diodes incorporated new product absolute maximum ratings (t a = 25 c, unless otherwise noted, note 3) symbol characteristics values unit v dd supply voltage 7 v i o(peak) maximum output curr ent (peak) 1000 ma p d power dissipation tsot26 650 mw u-dfn2020c-6 750 (note 4) t st storage temperature range -65 ~ +150 o c esd hbm human body model esd protection 4 kv notes: 3. stresses greater than the 'absolute maximum ratings' sp ecified above, may cause permane nt damage to the device. these are stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. device reliability may be affected by exposure to absolute ma ximum rating conditions for extended periods of time 4. u-dfn2020c-6 exposed pad soldered to minimum recommended landing pads (see package outline dimension section) on a two-laye r 2oz. copper fr4 pcb (1.6mm thickness) with no thermal vias in exposed pads or any copper flood connecting to the landin g pattern of the exposed pad. recommended operating conditions (t a = 25 c) symbol parameter conditions min max unit v dd supply voltage at v dd pin dc supply speed control mode 1.8 6.0 v t a operating ambient temperature range operating -40 +105 o c electrical characteristics (t a = 25 c, v dd = 5v) symbol characteristics conditions min typ. max unit i dd supply current no load - 2.2 - ma v oh output voltage high i out = 300ma 4.70 4.88 - v i out = 500ma 4.5 4.8 - v v ol output voltage low i out = 300ma - 0.12 0.3 v i out = 500ma - 0.2 0.5 v v oh +v ol output voltage of n- and pmos combined i out = 300ma 0.3 0.5 v i out = 500ma 0.5 v t sw output switching slope duration 17 load on o1/o2 - 200 - s i leak fg output leakage current - - 5 a v fgol fg output voltage low i fg = 5ma - - 0.4 v t on on time 350 500 650 ms r dr duty ratio t off / t on - 10 - t j _ sdn_th ic junction temperature thermal shutdown threshold 175 o c t j _ sdn_hyst ic junction temperature thermal shutdown hysteresis 25 o c
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 5 of 13 www.diodes.com march 2012 ? diodes incorporated new product magnetic characteristics (t a = 25 c, v dd = 1.8v to 6v, note 5) (1mt = 10 g) symbol parameter min typ. max unit b op operate point 10 25 50 gauss b rp release point -50 -25 -10 b hy hysteresis - 50 - notes: 5. magnetic characteristics may vary with supply voltage, operating temperature and after soldering. operating characteristics off op rp on output voltage in volts off rp op on output voltage in volts bop brp 0 bop brp 0 magnetic flux density in gauss magnetic flux density in gauss v ol v ol v oh v oh o1 o2 marking side s n (u-dfn2020c-6) marking side n (tsot26) s
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 6 of 13 www.diodes.com march 2012 ? diodes incorporated new product operating characteristics (note 6, 7, 8 and 9) fg o1 o2 ton toff ?re-start spinning? motor locked cleared motor locked detected mechanical lock magentic s n normal spinning truth table o1 o2 fg l h l h l h l l x (note 9) notes: 6. in ?normal spinning, the fg changes its state at each edge of o1. 7. 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. 8. 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. 9. x: h or l depends on magnetic pole north or south
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 7 of 13 www.diodes.com march 2012 ? diodes incorporated new product application note motor speed control dc supply voltage (v dd ) speed control motor speed can be controlled by varying the v dd supply voltage between 1.8v to 6v. with 5v nominal motor, changing v dd voltage between 5v to 1.8v, speed can be controlled from 100% to 36% typically. soft switching AH5794 uses soft switching of the motor coil current during commutation for to minimize audible switching noise and electromagnetic interference (emi) to provide a low noise solution. vdd vss vout 1 vout 2 200s typ.
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 8 of 13 www.diodes.com march 2012 ? diodes incorporated new product thermal performance characteristics (1) package type: tsot26 t a ( q c) 25 50 60 70 75 80 85 90 95 100 p d (mw) 651 521 469 417 391 365 339 313 286 260 t a ( q c) 105 110 115 120 125 130 135 140 145 150 p d (mw) 234 208 182 156 130 104 78 52 26 0 -40 25 50 75 100 125 150 105 700 600 500 400 300 200 100 0 650 p o we r dissi p a t i o n (mw) temperature (c) power dissipation curve
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 9 of 13 www.diodes.com march 2012 ? diodes incorporated new product thermal performance characteristics (cont.) (2) package type: u-dfn2020c-6 (note 10) t a ( q c) 25 50 60 70 75 80 85 90 95 100 p d (mw) 781 625 563 500 469 438 406 375 344 313 t a ( q c) 105 110 115 120 125 130 135 140 145 150 p d (mw) 281 250 219 188 156 125 94 63 31 0 notes: 10. u-dfn2020c-6 exposed pad soldered to minimum recommended l anding pads (see package outline dimension section) on a t wo-layer 2oz. copper fr4 pcb (1.6mm thickness) with no thermal vi as in exposed pads or any copper flood connecting to the land ing pattern of the exposed pad. -40 25 50 75 100 125 150 105 temperature (c) power dissipation curve 900 600 500 400 300 200 100 0 800 p o we r dissi p a t i o n (mw) 700
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 10 of 13 www.diodes.com march 2012 ? diodes incorporated new product ordering information device package code packaging (note 11 & 12) 7? tape and reel quantity part number suffix AH5794-wu-7 wu tsot26 3000/tape & reel -7 AH5794-fdc-7 fdc u-dfn2020c-6 3000/tape & reel -7 notes: 11. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.d iodes.com/datasheets/ap02001.pdf 12. eu directive 2002/95/ec (rohs) & 2011/65/eu (rohs 2) compliant. no purposely added lead. halogen and antimony free. please visit our website at http://www.diodes.com/products/lead_free.html marking information (1) package type: tsot26 part number package identification code AH5794-wu-7 tsot26 j4 (2) package type: u-dfn2020c-6 ( top view ) xx y : year : 0~9 x : a~z : internal code xx : identification code w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week y w x part number package identification code AH5794-fdc-7 u-dfn2020c-6 j4 packing package 7 : tape & reel wu : tsot26 fdc : u-dfn2020c-6 a 5794 - - h x xx 7
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 11 of 13 www.diodes.com march 2012 ? diodes incorporated new product package outline dimensions (all dimensions in mm) (1) package type: tsot26 (2) package type: u-dfn2020c-6 land pattern recommendation (unit:mm) top view 0.65 6x-0.45 6x-0.37 1.59 0.9 0.05 m c a b b 0.15 bottom view a c 0/0.05 0.57/0.63 0.15max. c 0.15 c 2x- 2x 0.08 c 0.05 c seating plane 1.55/1.75 1.95/2.075 0.30/0.40 0.2/0.3 0.65nom. 0.86/1.06 1.95/2.075 pin#1 id r 0 . 1 hall sensor top mark 0.43mon. (active area depth) r 0 . 1 5 0.550.1 1.00.1 0.300.1 die 0.57/0.63
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 12 of 13 www.diodes.com march 2012 ? diodes incorporated new product taping orientation (1) package type: u-dfn2020c-6 notes: 11. the taping orientation of the other package type can be found on our website at http://www.diodes .com/datasheets/ ap02007.pdf.
AH5794 single phase hall effect latch fan motor driver AH5794 document number: ds35809 rev. 1 - 2 13 of 13 www.diodes.com march 2012 ? diodes incorporated new product 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 ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity 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 desc ribed 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 unauthoriz ed 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 fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. 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 dev ices 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 ? 2012, diodes incorporated www.diodes.com

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