AM7228S

AM7228S Motor Driver ICs Single Phase Full-Wave Motor Driver for Fan Motor AM7228S This is the summary of application for AM7228S optimum for driving 12V fan for general consumer equipment. The most attractive function of AM7228S is slope adjust by external resistor, that can meet most of fan request. This IC employs soft switching drive, Bi-CMOS process, and realizes silent drive, low ON resistor, and low power consumption. This also incorporate lock protection and auto restart circuit which does not require external capacitor.  Applications Optimum for driving 12V fan for general consumer equipment  Features 1) 2) 3) 4) 5)  ~Co Slope adjust mode for VH and VL pin control. Soft switched drive. PWM speed control. Rotating speed pulse signal (FG) output. Incorporating lock protection and automatic restart circuit. nfid Absolute Maximum Ratings (Ta = 25℃) Parameter Supply voltage Output current FG single output current FG single output voltage Vref output current HB output current High duty slope setting voltage Low duty slope setting voltage Stop mode setting voltage Power dissipation (JEDEC 2S2P PCB) Operate temperature range Storage temperature range Junction temperature 6) Power Tr incorporated. 7) Hall Bias voltage built-in. 8) Soft start function built-in for reducing power up acoustic noise. 9) Stop mode duty adjustable. e nti Symbol VCC Iomax IFG VFG Iref IHB VH VL VStop Pd Topr Tstg Tjmax al~ Limits Unit 18 1200 10 18 10 10 6 6 6 3030* -40～+105 -55～+150 150 V mA mA V mA mA V V V mW ℃ ℃ ℃ * Pd de-rated by 24.2mW/C over 25℃ (based on JEDEC 2S2P board) Those are stress rating only and functional operating at those conditions for extended periods may damage to the device. JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -1- AM7228S Motor Driver ICs  Recommended operating conditions (Set the power supply voltage taking allowable dissipation into considering) Parameter Symbol Operating supply voltage range Hall input voltage range High duty slope setting voltage range Low duty slope setting voltage range Stop Mode setting voltage range  Min Typ Max Unit 2.5～16 0.2～2.1 0~Vref 0~Vref 0~Vref Vcc VHB VH VL VStop V V V V V Electrical Characteristics (Unless otherwise specified, Ta = 25℃, VCC = 12V) Parameter Supply current 1 Input offset voltage PWM input Max ICC1 1 3 6 mA PWM=GND ICC2 VREF VStopH 2 4.5 50 5 5 110 8 5.5 170 mA V mV PWM=OPEN Ivref=5mA Vref=5V VHOFS － ~Co Supply current 2 Reference Voltage Hysteresis of STOP mode Hall input Min Limit Typ Symbol Input H level Input L level Input frequency VPWMH VPWML FPWM nfid 2.5 -0.3 5 Output Output voltage Input-output Gain FG low voltage FG leakage current Input hysteresis voltage Hall bias voltage e nti － ±6 － － － Vref 0.8 100 V0 GIO VFGL IFGL VHYS VHB － 51 － － ±10 1.0 0.4 54 0.3 － ±17 1.15 0.6 57 0.4 20.0 ±25 1.3 TON TOFF 0.35 3.5 0.50 5.0 0.65 6.5 Unit Conditions mV al~ V V kHz V dB V μA mV V I0=200mA(Upper + Lower) IFG = 5mA VFG = 15V IHB=-5mA Lock protection Lock detection ON time Lock detection OFF time Sec Sec JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -2- AM7228S Motor Driver ICs  Block Diagram ~Co nfid e nti Fig1. Block diagram  Pin Description PIN No Pin Name 1 2 3 4 5 6 7  PGND OUT2 VCC H+ HB HFG Function al~ PIN No Pin Name Power ground terminal Motor output terminal Power supply terminal Hall input terminal Hall Bias Hall input terminal FG signal output terminal 8 9 10 11 12 13 14 Stop VL VH VREF PWM OUT1 AGND Function Stop mode setting terminal Hi duty slope setting terminal Low duty slope setting terminal Reference voltage output terminal PWM signal input terminal Motor output terminal Analog ground terminal Truth Table H+ H- H L H L H L L H L H L H PWM OUT1 OUT2 FG H L L L L L L H L L L L L (Output Tr : ON) Z (Output Tr : OFF) L (Output Tr : ON) Z (Output Tr : OFF) L (Output Tr : ON) Z (Output Tr : OFF) H L - Mode Operation mode Lock mode Z：Open drain output (High impedance) JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -3- AM7228S Motor Driver ICs  Thermal Information Θja junction-to-ambient thermal resistance 41.25℃/W Ψjt junction-to-top characterization parameter 1.34℃/W   Θja is obtained in a simulation on a JEDEC-standard 2s2p board as specified inJESD-51. The Θja number listed above gives an estimate of how much temperature rise is expected if the device was mounted on a standard JEDEC board.  When mounted on the actual PCB, the Θja value of JEDEC board is totally different than the Θja value of actual PCB. Ψjt is extracted from the simulation data to obtain Θja using a procedure described in JESD-51, which estimates the junction temperature of a device in an actual PCB.  ~Co  The thermal characterization parameter, Ψjt, is proportional to the temperature difference between the top of the package and the junction temperature. Hence, it is useful value for an engineer verifying device temperature in an actual PCB environment as described in JEDEC JESD-51-12.   When Greek letters are not available, Ψjt is written Psi-jt. Definition: nfid e nti al~ Where : Ψjt (Psi-jt) = Junction-to-Top(of the package) C/W Tj= Die Junction Temp. C Tt= Top of package Temp at center. C Pd= Power dissipation. Watts  Practically, most of the device heat goes into the PCB, there is a very low heat flow through top of the package, So the temperature difference between Tj and Tt shall be small, that is any error caused by PCB variation is small.  This constant represents that Ψjt is completely PCB independent and could be used to predict the Tj in the environment of the actual PCB if Tt is measured properly. JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -4- AM7228S Motor Driver ICs  How to predict Tj in the environment of the actual PCB Step 1 : Used the simulated Ψjt value listed above. Step 2 : Measure Tt value by using  Thermocouple Method We recommend use of a small ~40 gauge(3.15mil diameter) thermocouple. The bead and thermocouples wires should touch the top of the package and be covered with a minimal amount of thermally conductive epoxy. The wires should be heat-insulated to prevent cooling of the bead due to heat loss into wires. This is important towards preventing “too cool” Tt measurements, which would lead to the calculated Tj also being too cool.  IR Spot Method An IR Spot method should be utilized only when using a tool with a small enough spot area to acquire the true top center “hot spot”. Many so-called “small spot size” tools still have a measurement area of 0~100+mils at “zero” distance of the tool from the surface. This spot area is too big for many smaller packages and likely would result in cooler readings than the small thermocouple method. Consequently, to match between spot area and package surface size is important ~Co nfid while measuring Tt with IR sport method. Step 3 : calculating power dissipation by e nti P  (VCC–|Vo_Hi – Vo_Lo|) x Iout + VCC x Icc al~ Step 4 : Estimate Tj value by Tj= Ψjt x P+Tt Step 5: Calculated Θja value of actual PCB by the known Tj Θja(actual) = (Tj-Ta)/P JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -5- AM7228S Motor Driver ICs Maximum Power Dissipation (de-rating curve) under JEDEC PCB & actual PCB ~Co nfid e nti al~ JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -6- AM7228S Motor Driver ICs  Application circuit *1 *2 *3 ~Co *4 nfid *6 e nti Fig2. Application circuit al~ *7 *5 1. Reverse connection of power supply may break the device. A countermeasure is needed such as using reverse current protection diode (D1) between power supply and VCC terminal. The BEMF causes re-circulate current to power supply, when power-on or output changes. It may cause VCC terminal to raise voltage, especially using reverse current protection diode (D1) because there is no way to return current back to power supply. In such case, please take necessary measures like below. 2. Connect a Zener diode (ZD1) between VCC and GND terminal not to exceed the absolute maximum rating voltage. 3. Connect a capacitor (C1) between VCC and GND terminal to make a path of return current to power supply. 4. Open drain output. A pull-up resistances of 10kΩ should be inserted. JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -7- AM7228S Motor Driver ICs 5. Stop Mode Control: When the IC using as Stop Mode control. The Stop Mode is setting by Stop pin, and Stop Duty can be adjusted by RS1 and RS2 ratio. The relation is shown as the Fig. 3 below. When not need this feature, set the Stop pin connected to Vref, avoid noise interference. ~Co nfid e nti Fig.3 Stop mode control al~ 6. Slope Low duty control: When the IC using as Slope low duty control. The low duty control is setting by VH pin, and low duty control can be adjusted by RH1 and RH2 ratio. Typical setting is 0.75VREF, The relation is shown as the Fig. 4 below. Fig.4 Slope low duty control JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -8- AM7228S Motor Driver ICs 7. Slope Hi duty control: When the IC using as Slope Hi duty control. The Hi duty control is setting by VL pin, and Hi duty control can be adjusted by RL1 and RL2 ratio. Typical setting is 0.25VREF. The relation is shown as the Fig. 5 below. ~Co nfid e nti Fig.5 Slope Hi duty control al~ 8. When PCB Layout, PGND & AGND (PIN 1 & Pin14) & E-PAD must be short-circuited to avoid noise. JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice -9- AM7228S Motor Driver ICs  Lock detection, automatic restart circuit This IC detect the rotation of the motor by hall signal, and adjust lock detection ON time (Ton) and lock detection OFF time (Toff) by the internal counter. These time (Ton, Toff) are showed below. H+ OUT1 TOFF OUT2 FG ~Co TON nfid Motor Detect lock lock e nti Lock Soft Start Lock cancel al~ Reset ordinary motion Fig.6 Lock detect and auto restart motion Only in Lock detection ON Time (Ton), motor will be rest ordinary motion by switching over of hall signal. There is lock soft start function, When IC in reset ordinary motion, Output will shaping by 50% duty to start-up the motor, that will reduce lock start current and acoustic noise. This IC make the lock protection function off, when the PWM input keeps low level for more than 70ms (typ.) PWM 70ms(typ) Lock protect enable (internal) enable disable enable Fig.7 PWM input signal and lock protect function Lock protect function does not work if PWM input frequency is slower than 15Hz (typ.) So, please input faster frequency more than 20Hz JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 10 - AM7228S Motor Driver ICs  Soft switching function (silent drive setting) Input signal to hall amplifier is amplified to produce an output signal. When the hall element output signal is small, the gradient of switching of output waveform is gentle; When it is large on the contrary, the gradient of switching of output waveform is steep. Gain of 500 times (Typ.) is provided between input and output, therefore enter an appropriate hall element output to IC where output waveform swings sufficiently. ~Co nfid Fig.8 Relation between hall element output amplitude and output waveform  Hall input setting e nti Hall input voltage range is shown in operating conditions. al~ Fig.9 Hall input voltage range Adjust the value of hall element bias resistor R1 in Fig.10 so that the input voltage of a hall amplifier is input in "hall input voltage range" including signal amplitude. Input out of the hall input voltage range may cause unexpected operation of output. JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 11 - AM7228S Motor Driver ICs Reducing the noise of hall signal Hall element may be affected by the depending on the wiring pattern of board. In this case, place a capacitor like C1 in Fig.10. In addition, when wiring from the hall element output to IC hall input is long, noise may be loaded on wiring. In this case, place a capacitor like C2 in Fig.10. ~Co Fig.10 Application in the vicinity of hall signal  PWM input nfid e nti Rotation speed of motor can be changed by controlling ON/OFF of the upper output depending on duty of the signal input to PWM terminal. al~ Fig.11 Timing chart in PWM control When the voltage input to PWM terminal applies H logic : normal operation L logic : H side output is off When PWM terminal is open, H logic is applied. PWM terminal has hysteresis of 100mV (Typ.). If H logic is applied to PWM terminal before Vcc voltage is applied to IC, current flows to Vcc terminal through ESD protection diode inside PWM terminal, resulting in malfunction may possibly occur. When Vcc voltage is not apply to IC, do not apply voltage to PWM terminal. JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 12 - AM7228S Motor Driver ICs  Notes 1) Absolute maximum ratings This product is produced with strict quality control, but destroyed in using beyond absolute maximum ratings. Once IC destroyed, a failure mode cannot be defined (like short-mode or open-mode).Therefore, physical security counter measure, like fuse, is to be given when a specific mode to be beyond absolute maximum rating is considered. 2) Reverse connection of power supply Reverse connection of the power supply may break the device. A countermeasure is needed such as using reverse current protection diodes between the power supply and the VCC terminal. 3) Power supply line The BEMF causes re-circulate current to power supply, Please connect a capacitor between power supply and GND as a route of re-circulate current. And please determine the capacitance after confirmation that the capacitance does not causes any problems. 4) GND potential The GND terminal should be the location of the lowest voltage on the chip. 5) Thermal design The thermal design should allow enough margin for actual power dissipation. 6) Mounting failures Mounting failures, such as misdirection or miss-mounts, may destroy the device. The electrical short caused by falling particle, between outputs; power supply and output; or output and ground, may damage the device. ~Co nfid e nti al~ JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 13 - AM7228S Motor Driver ICs  Packaging outline --- eTSSOP 14L ~Co Unit : mm nfid e nti reference JEDEC MO229(D)VJGD-2 SYMBOL A A1 A2 A3 b c D E1 E D2 E2 L L1 e MILLIMETERS Min. Max. 1.2 0.05 0.15 0.9 1.05 0.39 0.49 0.2 0.3 0.13 0.19 4.86 5.06 4.3 4.5 6.2 6.6 2.9 3.1 2.9 3.1 0.45 0.75 1.00BSC 0.65 BSC al~ INCHES Min. 0.002 0.035 0.015 0.008 0.005 0.190 0.168 0.242 0.113 0.113 0.018 Max. 0.047 0.006 0.041 0.019 0.012 0.007 0.197 0.176 0.257 0.121 0.121 0.029 0.039 BSC 0.026 BSC JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 14 - AM7228S Motor Driver ICs  Condition of Soldering 1).Manual Soldering Time / Temperature ＜ 3 sec / 400 + 10 oC Test Results：0 fail/ 22 tested Manual Soldering count：2 Times （2 Times） 2).Re-flow Soldering (follow IPC/JEDEC J-STD-020D) Classification Reflow Profile Profile Feature Average ramp-up rate (TL to TP) Preheat - Temperature Min (Ts min) - Temperature Max (Ts max) - Time (ts) from (Tsmin to Tsmax) Ts max to TL - Temperature Min (Ts min) Time maintained above: - Liquid us temperature (TL) - Time (tL) maintained above TL Peak package body temperature (Tp) Time with 5oC of actual Peak - Temperature (tp) Ramp-down Rate Time 25oC to Peak Temperature ~Co Test Results：0 fail/ 32 tested Pb-Free Assembly 3oC/second max. 150oC 200oC 60-120 seconds 3oC/second max. nfid 217oC 60-150 seconds 260 +0/-5oC 30 seconds e nti 6oC/second max. 8 minutes max. al~ Reflow count：3 cycles JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 15 - AM7228S Motor Driver ICs  Marking Identification Row 1 AMtek Row 2 Part number Row 3 ~Co nfid e nti al~ Week：Assembly Date Code Year：Assembly Year ( Year_A=0,B=1,C=2,D=3,E=4,F=5,G=6,H=7,I=8,J=9, exp 2012=C ) Lot no：Wafer Lot No JUNE.. 2014 V1.1 http://www.amtek-semi.com Specifications subject to change without notice - 16 -