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ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 1 of 13 www.diodes.com august 2011 ? diodes incorporated new product description the ah5795 is a single chip solution for driving single-coil brushless direct current (bldc) fans and motors. the integrated full-bridge driver ou tput stage uses soft switching to minimize audible switching noise and electromagnetic interference (emi) providing a low noise solution. motor speed can be controlled by either changing the duty ratio of the pwm signal at the pwm pin or by varying the supply voltage at vdd pin. to help protect the motor coil, the ah5795 provides rotor lock protection which shuts down the output drive if rotor lock is detected. the device aut omatically 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. the fg output is the magnetic change frequency. the ah5795 is available in space saving and low profile tsot23-6 and 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 ? speed control methods o vdd voltage speed control (pwm pin tied to vdd) o pwm signal speed control via pwm pin ? soft switching for low noise dc fan motor applications ? rotor lock protection (lock detection, output shutdown and automatic re-start) ? toff clear when pwm is low for greater than 65ms ? thermal protection ? tachometer (fg) output ? no external timing capacitor - reduces the numbers of external components required ? low profile package: tsot23-6 and dfn2020c-6 ? ?green? molding compound (no br, sb) (note 1) pin assignments 6 2 4 3 1 (top view) o2 vss fg pwm o1 tsot23-6 5 vdd pwm vdd o1 1 2 3 6 5 4 fg o2 vss (top view) dfn2020c-6 applications ? 3.3v / 5v bldc cooling fans ? netbook/ notebook bldc fans ? instruments cooling fans ? low voltage/ low power bldc motors notes: 1. eu directive 2002/95/ec (rohs). all applicab le rohs exemptions applied. please visit our website at http://www.diodes.com /products/lead_free.html .
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 2 of 13 www.diodes.com august 2011 ? diodes incorporated new product typical application circuit vdd fg o1 o2 fg vss 10kohm ah5795 pwm system power dz c1 d1 pwm signal for speed control pin descriptions pin name description v dd power supply pin v ss ground pin o1 output driving & sinking pin o2 output driving & sinking pin pwm pwm signal input pin for speed control fg frequency generator (note 2) notes: 2. the fg output is the same as the magnetic change frequency.
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 3 of 13 www.diodes.com august 2011 ? diodes incorporated new product functional block diagram (note 3) lock detect, shutdown and automatic re-start soft switching control hall sensor amp vdd fg o1 o2 power vss logic block full bridge driver pwm frequency generator notes: 3. the ah5795 has an open-drain tachometer fg output that follows the magnetic change frequency. typically a pull-up res istor of 10k ? is recommended from fg pin to the supply voltage.
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 4 of 13 www.diodes.com august 2011 ? diodes incorporated new product absolute maximum ratings (t a = 25 c, unless otherwise noted, note 4) symbol characteristics values unit vdd supply voltage 7 v i o(peak) maximum output current (peak) 1000ma ma p d power dissipation tsot23-6 650 mw dfn2020c-6 780 (note 5) t st storage temperature range -65 ~ 150 o c esd hbm human body model (hbm) esd protection 4 kv notes: 4. 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 absolu te maximum rating conditions for extended periods of time 5. dfn2020c-6 exposed pad soldered to minimum recommended landing pads (see package outline dimension section) on a two-layer 2oz. copper fr4 pcb (1.6mm thickness) with no thermal vias in exposed pads or any copper flood connecting to the landing pattern of the exposed pad. recommended operating conditions (t a = 25 c) symbol paramete r conditions min max unit v dd supply voltage operating 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 idd 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 voh+vol output voltage of n- and pmos combined i out = 300ma 0.3 0.6 v i out = 500ma 0.5 v t sw output switching slope duration 17 load on out1/out2 - 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 - v pwmh pwm input h level - 0.5 vdd - vdd v v pwml pwm input l level - 0 - 0.14 vdd v i pwmh pwm input current h level pwm=vdd 0 ua i pwmh pwm input current l level pwm=gnd -10 ua f pwm pwm input frequency - 0.02 - 50 khz d pwm _ min output minimum duty ratio motor rotating; 10% 100 % tj_ sdn_th ic junction temperature thermal shutdown threshold 175 o c tj_ sdn_hyst ic junction temperature thermal shutdown hysteresis 25 o c
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 5 of 13 www.diodes.com august 2011 ? diodes incorporated new product magnetic characteristics (t a = 25 c, vdd = 1.8v~6v, note 6) (1mt = 10 g) symbol parameter min typ. max unit b op operate point 10 25 50 gauss brp release point -50 -25 -10 b hy hysteresis - 50 - notes: 6. 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 (dfn2020c-6) n marking side n (tsot23-6) s
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 6 of 13 www.diodes.com august 2011 ? diodes incorporated new product operating characteristics (cont. note 7, 8, 9 and 10) 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 pwm fg l h h l h l h h l l l x (note 10) notes: 7. in ?normal spinning, the fg changes its state at each edge of o1. 8. 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 moto r locks with north pole at the hall element, o1 is kept on ?l?, o2 is a clock with ton/toff ratio. 9. when ?re-start spinning? occurs, the motor speed ramps up to the ?normal spinning? speed from zero. speed ra mp-up profile depends on motor characteristics. 10. x: h or l depends on magnetic pole north or south
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 7 of 13 www.diodes.com august 2011 ? diodes incorporated new product application note dc supply voltage speed control motor speed can be controlled by varying the vdd supply voltage while pwm pin is tied to vdd pin. for example, with 5v nominal motor, changing supply volt age between 5v to 1.8v, speed can be reduced from 100% to 36% typically. pwm speed control motor speed can also be adjusted by applying a pwm speed contro l signal into the pwm pin while keeping the vdd pin at nominal motor voltage. the motor speed is proportional to the pw m signal duty. for example, with 5v nominal motor, vdd pin is maintained at 5v typical while varying the pwm control signal duty to adjust the motor speed linearly. figure below shows the output o1 and o2 in relation to pwm speed control signal at pwm pin. frequency of pwm speed control signal can be between 15hz to 50khz. recommended typical pwm signal frequency is 25khz to keep switching frequency away from audible band. if pwm signal level at pwm pin stays low for longer than 65ms typical, the outputs are disabled. depending on the motor design and its inertia, minimum star t-up pwm duty required can be typically between 30% - 40% while minimum running pwm duty can be down to 20%-25% typical. if voltage at vdd is lower than the nominal motor voltage, both start-up pwm duty and minimum running pwm duty required will be higher.
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 8 of 13 www.diodes.com august 2011 ? diodes incorporated new product application note (cont.) rotor lock toff and pwm signal when pwm signal input at pwm pin is low for longer than 65ms, in ternal rotor lock protection toff is cleared. this allows the device to enter motor start ton time on the next pwm high signal pwm rotor lock protection (internal signal) enabled disabled (toff cleared) enabled 65ms (max) soft switching ah5795 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.
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 9 of 13 www.diodes.com august 2011 ? diodes incorporated new product thermal performance characteristics (1) tsot23-6 t a ( 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 ( c) 105 110 115 120 125 130 135 140 145 150 p d (mw) 234 208 182 156 130 104 78 52 26 0 (2) dfn2020c-6 (note 11) t a ( 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 ( 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: 11. dfn2020c-6 exposed pad soldered to minimum recommended landing pads (see package outline dimension section) on a tw o-layer 2oz. copper fr4 pcb (1.6mm thickness) with no thermal vias in exposed pads or any copper flood connecting to the lan ding pattern of the exposed pad. 0 100 200 300 400 500 600 700 800 900 0255075100125150 p d (mw) t a (c) power dissipation curve -40 105 0 100 200 300 400 500 600 700 0 25 50 75 100 125 150 p d (mw) t a (c) power dissipation curve -40 105 650
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 10 of 13 www.diodes.com august 2011 ? diodes incorporated new product ordering information ah 5795 - xxx - 7 packing package 7 : tape & reel wu : tsot23-6 fdc : dfn2020c-6 device package code packaging (note 12 & 13) 7? tape and reel quantity part number suffix AH5795-WU-7 wu tsot23-6 3000/tape & reel -7 ah5795-fdc-7 fdc dfn2020c-6 3000/tape & reel -7 notes: 12. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at http://www.diodes.com /datasheets/ap02001.pdf 13. 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) tsot23-6 1 2 3 6 7 4 xx y w x xx : identification code w : week : a~z : 1~26 week; x : internal code (top view) y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week 5 part number package identification code AH5795-WU-7 tsot23-6 j5 (2) dfn2020c-6 ( top view ) xx y : year : 0~9 x : 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 ah5795-fdc-7 dfn2020c-6 j5
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 11 of 13 www.diodes.com august 2011 ? diodes incorporated new product package outline dimensions (all dimensions in mm) (1) package type: tsot23-6 (2) package type: dfn2020c-6 0.10 m c a b b 0.25 bottom view a a 0/0.05 0.57/0.63 0.15max. c 0.25 b 2x- 2x 0.08 c 0.10 c seating plane 1.55/1.75 1.95/2.075 0.25/0.35 0.25/0.35 0.65nom. 0.86/1.06 1.95/2.075 pin#1 id r 0 . 1 0.43mon. (active area depth) r 0 . 1 5 land pattern r ecommendation (unit:mm) top view 0.65 6x-0.45 6x-0.37 1.59 0.9 hall sensor 1.00.1 0.60.1 hall sensor locator pin#1
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 12 of 13 www.diodes.com august 2011 ? diodes incorporated new product taping orientation for dfn2020c-6 notes: 14. the taping orientation of the other package type can be found on our website at http://www.diodes .com/datasheets/ ap02007.pdf.
ah5795 single phase hall effect latch smart fan motor controller ah5795 document number: ds35277 rev. 1 - 2 13 of 13 www.diodes.com august 2011 ? 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 ? 2011, diodes incorporated www.diodes.com

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