MC33288 solid state relay for automotive flasher applications pin assignment simplified application schematic dh suffix 1 2 3 5 4 6 7 8 9 10 1 2 3 5 4 6 7 8 9 20 1 1 1 1 1 1 1 1 1 cur r in-1 nc dnc* out-1 out-1 out-1 nc nc in-2 wlp status nc out-2 out-2 out-2 nc nc 21 21 vbat vbat gnd heat sink dnc* mcu out-2 out-1 MC33288 vbat in-1 in-2 st cur r gnd 21w 5w trailor car left side lamps car right side lamps 21w 21w 5w 21w 5w 5v 21w 21w 5w a/d i/o i/o i/o buzzer warning switch turn switch dashboard direction indicator dashboard trailer indicator +- static flasher wlp 1.2w 10k 5v hsop20 package device operating temperature range package MC33288dh ta=-40 to +125c hsop20 MC33288dhr2 ta=-40 to +125c hsop20 case 979-04 ordering information solid state relay for automotive flasher applications semiconductor technical data semiconductor technical data motorola order number: MC33288/d rev. 4.8, 06/2001 advance information this document contains information on a new product. specifications and information herein are subject to change without notice. ? motorola , inc. , 2001. all ri g hts reserved. tm this device is a dual high side power switch dedicated for automotive flasher applications. in comparison with mechanical solutions, this device offers higher reliability as well as protection and diagnostic features. the device consists of two 25m ? rdson fully protected high side switches, in a surface mount power package. it interfaces directly with a microcontroller and includes a current recopy function in order to allow the detection of a failed lamp in the application. ? designed for automotive flasher applications junction temperature range from - 40 c to 150 c operating voltage range from 8v to 35v maximum breakdown voltage greater than 40v protected in case of loss of ground surface mount power package 25m ? rdson per channel at 25 c 8amps nominal current per channel 1.2w warning lamp driver overtemperature protection with hysteresis open load detection in on-state short-circuit protection overload current protection current recopy to monitor lamp output current under voltage shutdown esd protection 2kv standby current less than 10 a at v bat less than 14v * do not connect f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33288 pins function description solid state relay for automotive flasher applications 2 pin no. name/function description tab v bat supply voltage the backside tab is connected to the power supply of the MC33288dh. in addition to its supply function, this pin contributes to the thermal behaviour of the device by conducting the heat from the switching mosfet to the printed circuit board. 6,7,8 13,14,15 out1 output channel 1 out 2 output channel 2 pins 6,7,8 are the source of the output1 25mohm mosfet1. pins 13,14,15 are source of the output 2 25mohm mosfet2. they deliver current to the connected loads and are respectively controlled via the in1 and in2 pins. these outputs are current limited and thermally protected. 3 18 in 1 input channel 1 in 2 input channel 2 these are the device input pins which directly control their associated outputs. the levels are cmos compatible. when the input is a logic low, the associated output mosfet is in the off state. when input is high, the mosfet is turned on and the load is activated. when both inputs are low, the device is in standby mode and its supply current is reduced. each input pin has an internal active pull down, so that it will not float if disconnected. 19 status status for both channels the fault output is an open drain indication that goes active low when a fault mode (openload, overtemp) is detected by the device on either one channel or both simultaneously. its internal structure is an open drain architecture with an internal clamp at 6v. an external pull up resistor connected to vdd (5v) is needed. see functional truth ta bl e . 20 wlp warning lamp output this pin is the source of a 3.2 ohm mosfet. this output is current limited and thermally protected. it delivers current through the connected load when both in1 and in2 inputs are logic high. it is usually used as a warning lamp driver for flasher application. 2cur r load current sense the current sense pin deliver a ratioed amount (1/1000) of the sum of the currents that can be used to generate signal ground referenced output voltages for use by the microcontroller. 4, 9, 10, 11, 12, 17 nc not connected these pins are not used. 5, 16 dnc do not connect these pins must not be connected. 11 gnd ground this is the ground pin of the device. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33288 solid state relay for automotive flasher applications 3 block diagram and application schematic functional truth table l = ? low level ? h = ? high level ? x = ? don ? t care ? notes : in case of over current or short-circuit, the device will not report the fault to the status pins. the output current will be l imited to the ilim value. the device will probably heat up and in this case the overtemperature detection will be triggered. if so, the output will be turned off and the fault wi ll be reported to the status pins. in-1 in-2 out-1 out-2 st normal operation l h l h l l h h l h l h l l h h h h h h openload channel 1 openload channel 2 h x x h h x x h l l overtemp channel 1 overtemp channel 2 overtemp channel 1 and channel 2 h l x x h x x h l h l l x x l x x l l l l h l h l overcurrent or current limit channel 1 (note) overcurrent or current limit channel 2 (note) h x x h h x x h h h battery mcu out-1 in-1 left side out-2 in-2 charge pump fault input trigger over te m p over current out-1 out-2 gnd channel 1 channel 2 current recopy cur r cr 2 current copy resistor 21+21+5w right side 21+21+5w a/d i/o v bat cr 1 trailor right side 21+5w 21+5w trailor left side MC33288 cb r r left right i/o r st i/o r out-1 out-2 monitoring r : 10k typical rcr : 500 ? to 1k ? typical cb : 100nf to 470nf rwlp : 100 ? typical st-2 st-1 rcr drive & protect vbat vbat wlp 1.2w in-2 warning lamp driver rwlp open load v batc 5v 10k f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33288 solid state relay for automotive flasher applications 4 maximum ratings notes : 1. eds1 testing is performed in accordance with the human body model (czap = 100pf, rzap = 1500 ? ) 2. eds2 testing is performed in accordance with the machine model (czap = 100pf, rzap = 0 ? ) 3. during lamp inrush current. 4. device mounted on dual side printed circuit board with 70 m copper thickness and 10cm 2 copper heat sink (2.5 cm 2 on top side and 7.5 cm 2 on down side). 5. assuming a 150 c maximum junction temperature. electrical characteristics (vbat from 9 to 16v and junction temperature tj from -40 to 150 c, unless otherwise noted ) ratings symbol value unit electrical ratings vbat voltage with respect to gnd : continuous/pulse vbat -14 to + 40 v out-1 & out-2 voltage with respect of gnd : continuous/pulse vout -0.3 to 40 v out-1 to vbat & out-2 to vbat voltage : continuous/pulse vout 40 v in-1, in-2, st dc voltage : continuous/pulse vin -0.3 to 7 v cur r voltage : continuous/pulse vcr -0.3 to 7 v esd all pins human body model (note1) machine model (note2) v esd1 v esd2 +/-2000 +/-200 v v out-1, out-2 output current : pulse (note 3) ioutp 40 amp in-1, in-2, st iin +/-5 ma thermal ratings junction temperature tj - 40 to 150 c storage temperature range tst - 65 to +150 c thermal resistance junction to case rthjc 2 c/w thermal resistance junction to ambient (note 4) rthja 25 c/w power dissipation at tcase 140 c (note 5) pd 5 w description symbol characteristics unit conditions min. typ. max. nominal operating voltage v bat 916v functional operating voltage v bat 835v under voltage threshold v uv 67 8v vbat standby supply current i stdby 110 av bat <14v & v in = 0v,t j <125 c supply current in on state i on 8 20 ma in-1 & in-2 @3.5v, no fault, vbat<14v,t j <125 c drain to source on resistance r dson 20 25 m ? iout =4a, v bat > 9v & t j = 25 c drain to source on resistance r dson 30 40 m ? iout = 4a, v bat > 9 & t j = 150 c high current limitation i lim 30 a vout > 1v short circuit limitation i lim 4 a vout < 1v, tj=25 c hot openload threshold i ol 1a vbat to output breakdown voltage v dss 40 v in-1 and in-2 @ 0v, vout = 0, iout -0.25ma vbat to out-1 : leakage current i out-leak 10 a vin-1 =0v, vbat =35v, vout-1=0v f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33288 solid state relay for automotive flasher applications 5 vbat to out-2 : leakage current i out-leak 10 a vin-2 =0v, vbat =35v, vout-2=0v vin-1, vin-2 : input voltage low threshold v il 1.5 v vin-1, vin-2 : input voltage high threshold v ih 3.5 v vin-1, vin-2 : input voltage hysteresis v ih 0.4 0.7 0.9 v vin-1, vin-2 : input current i in 18 40 a vin-1, vin-2 = 3.5v status output voltage vst 0.5 v ist = 1ma; output in fault thermal shutdown t shut 150 c thermal shutdown hysteresis t hyst 10 c current recopy ratio cr 1/1000 vout>vbat -1v, iout from 2a to 4a tj -40 c to 105 c, vbat 9 to 16v current recopy ratio accuracy cr-ac -10 10 % vout >vbat -1v, iout from 2a to 4a tj -40 c to 105 c, vbat 9 to 16v extended current recopy ratio crex 1/1000 vout >vbat -1v, iout from 1a to 8a extended current recopy ratio accuracy crex-ac -20 20 % vout >vbat -1v, iout from 1a to 8a current recopy clamp voltage at 10ma vclst 5.5 7 v nominal flasher frequency operation ffl 1.5 hz frequency operation fop 100 hz nominal flasher duty cycle operation dcfl 50 % wlp output drain to source on resistance rw on 3.2 ? iout =100ma, v bat > 9v & t j = 25 c wlp output drain to source on resistance rw on 5 ? iout =100ma, v bat > 9v & t j = 125 c wlp output current limitation iw lim 500 ma vout =0v wlp thermal shutdown tw shut 150 c maximum output positive slew rate tr 0.01 0.3 2 v/ s load = 6 ? maximum output negative slew rate tf 0.01 0.3 2 v/ s load = 6 ? turn on delay time tdon 1 30 200 s load = 6 ? , from vin/2 to 10% vout turn off delay time tdoff 1 40 200 s load = 6 ? , from vin/2 to 90% vout description symbol characteristics unit conditions min. typ. max. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33288 device description introduction the MC33288dh is a dual high side switch with appropriate control, protection, and diagnostic features dedicated to automotive flasher applications. the device consists of two independent 25m ? power switches and an additionnal 3.2 ohm high side switch capable of controlling a 1.2w warning lamp. it interfaces directly with a microcontroller and the package used is a hsop20 power small outline, 20 pins. the MC33288 incorporates a status pin and a load current sense capability. power supply the MC33288 can be directly connected to the supply line. in standby mode (in-1 & in-2 @ ov), the supply current is less than 10 a for vbat supply voltage below 14v. this feature allows a very low supply current on the battery when the car is idle or parked. during off state, the current recopy pin and the status pins are in high impedance. in case of loss of (digital) ground, the power mosfets turn off in order to safely tie the load current to zero. nominal voltage and transient operation the nominal operation voltage is from 9 to 16v. the MC33288 is functional over a larger voltage range from 8v to 35v. the technology used for both power and analog circuitry sustains 40v dc voltage. reverse battery the MC33288 is self protected against reverse battery up to -14 volts in a continuous mode. when a negative battery voltage arises, the mosfets are internally turned off. the load current flows in the body diode of each mosfet. the power dissipation within the MC33288dh is then vf x iload, where iload is the total current set by the loads and vf is the forward body diode voltage. vf is 0.5v typical at 150 c and decreases with temperature with a drop of -2mv/ c. power output switches the device has two independent high side switches. each switch is realised with an n-channel power mosfet and includes current and temperature sensing circuitries. the mosfet gates are driven by analog circuitry which includes charge pump and fault detection. a specific feature of this device is the output current recopy. each output has a 25m ? rdson max at 25 c. the rdson value reaches 40m ? at 150 c junction temperature. each output has a parasitic drain to source diode, inherent to the technology. this diode can sustain as much current as the mosfet. this diode is reversed biased during normal operation of the mosfet and is forward biased during reverse battery or negative transient pulses. the output mosfet can each drive 8 amps nominal. this maximum current condition occurs when up to three 21w lamps and two small 5 or 7w lamps are connected on each channel, at higher vbat voltage specification. this is the case when a trailor is attached to the car. as the flasher can operate in warning or hazard operation mode with its two channels on, the MC33288 can drive 16 amps total. when lamps are turned on, the inrush current can reach up to 6 times the nominal lamp current. for this particular application, the total inrush current can reach 6 time 8 amps, that is up to 48amps per channel. the 48amps value will only occur at the first lamp turn on. in order to optimise the total system,(MC33288, printed circuit board, wiring, fuse etc.) the device incorporates a current limitation at 30 amps typical. this mean that the really first inrush current will be clamped at 30 amps. the second lamp turn on of the flashing cycle will not see any clamping as the lamps have been heated up in the previous cycle. in-1 and in-2 are the two inputs of the device, connected to a microcontroller i/o ; they are cmos compatible. when these inputs are in low state, the device is in standby mode. when any of the inputs are switched to a high level, the associated output mosfet is turned on. status the device has a single status pins which reports an over temperature and an openload condition in the device. this pin is an open drain structure and needs an external pull up resistor. the device incorporates overtemperature sense on each output mosfet in order to independently protect each output. but , the report of the overtemperature is done through one single status pin called status, in order to minimise the number of i/o connection of the mcu. open load function the open load detection is active during the on phase (hot open load detection). an amplifier measures the differential volt- age between v bat and v out . when the load current is below 1a, the open load circuitry will pull down the status output. if the open load condition is present before the device turn-on, the status will be pulled down after a delay due to the rise time of the output. current recopy function flasher application needs to detect failed lamp. the system must detect one 21w lamp failing, in the flasher application only, without a trailor. the MC33288 has an output current recopy function which recopies on the cur r pin a portion of the output current. each channel is connected to the same cur r pin as the system have to operate in the flasher mode only and not in the warning operation. the MC33288 provides a current recopy of 1/1000 of the main output current, either output left or right. the recopy function has its higher accuracy of +-10% in the usual operation range and an accuracy of +-20% in the total operating range. this allows a precise detection of one 21w lamp, but also the detection of additional lamps in case of trailor connection. an external resistor must be connected to the cur r pin and then tied to a microcontroller a/d input for analog voltage measurement. the cur r pin is internally clamped to protect the mcu a/d input. warning lamp driver the warning lamp driver is a 3.2 ohms rdson max high side mosfet to control the 1.2w dashboard warning lamp. this output is current limited and thermally protectedactivated only in the warning mode. it is turned on by activation of both right and left inputs (in1 and in2) package the device is assembled into a power surface mount package. this package offers high thermal performances and high current capabilities. it offers 10 pins on each package sides and an additional pin which is the package heat sink , called pin 21. the heak sink acts as the MC33288 power vbat connection. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MC33288 solid state relay for automotive flasher applications 7 soldering information this device is packaged in a surface mount power package indended to be soldered directly on the printed circuit board. this device was qualified according to jedec standards jesd22-a113-b and j-std-020a with the reflow conditions applicable for packages with thickness above 2.5mm : convection 220 c +5/-0 c vpr 215-219 c ir / convection 220 c +5/-0 c the maximum peak temperature during the soldering process should not exceed 220 c (+5 c/-0 c). the time at maximum temperature should range from 10 to 40s max. thermal management the junction to case thermal resistance is 2 c/w maximum. the junction to ambient thermal resistance is dependent on the mounting technology and the addition of heat sink. one of the most commonly used mounting technique consists in using the printed circuit board and the copper lines as heat sink. figure 1. printed board layout example (not to scale) figure 1 shows an example of printed circuit board layout. it has a total of 10cm 2 additional copper on two sides (2.5 cm 2 on the top side and 7.5 cm 2 on the down side). with the above layout, thermal resistance junction to ambient of 25 c/w can be achieved, this value being splitted into : junction to case : rthjc1 = rthjc2 = 2 c/w case to ambient : rthca = 23 c/w. lower value can be reached with the help of larger and thicker copper metal, higher number of thermal via from top to down side pcb and the use of additional thermal via from the circuit board to the module case. steady state thermal model the junction to ambient thermal resistance of the circuit mounted on a printed circuit board can be splitted into two main parts : junction to case and case to ambient resistances. a simplified steady state model is shown in figure 2. figure 2. simplified thermal model (electrical equivalent) transient thermal model a more complete model including thermal capacitance is proposed in figure 3. figure 3. transient thermal model this gives a thermal impedance versus time (figure 4), which has been determined with the printed circuit board shown in figure 1. figure 4. junction to ambiant thermal impedance this figure shows that the steady state is reached after about 10 minutes. it also clearly shows that the device can dissipate almost twice the power within one minute compared to the maximum allowed power dissipation in steady state. down side pcb top side pcb 2 cm 2 8 cm 2 hsop20 external pcb (4x4 cm) thermal via from top to down side pcb rthca rthjc2 rthjc1 chan 1 junction ambient temp node chan 2 case temp node chan 2 junction temp node te m p n o d e chan 1 switch chan 2 switch power (w) chan 1 power (w) (1.0a=1w of (1.0v=1 c) (volts represent die surface temperature) (1.0 ? =1 c/w) power dissipation) 2 c/w 2 c/w 25 c/w ambienttemperature mos1 mos2 control case board ambiant 3k/w 3k/w 3k/w 450k/w 3k/w 20k/w 6j/k 0.5j/k 4mj/k 5mj/k 5mj/k 1mj/k 3.5k/w 3.5k/w 300k/w mos3 30 20 10 0 0 100 200 300 400 500 600 700 800 thermal impedance ( c/w) time (sec.) f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, represen tation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. ? typical ? parameters which may be provided in motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ? typical ? must be validated for each customer application by customer ? s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products a re not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any application in which the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola produ cts for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and distributors ha rmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or un authorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the parts. motorola and are registered t rademarks of motorola, inc. motorola, inc. is an equal employment opportunity/affirmative action employer. how to reach us: usa / europe / locations not listed : motorola literature distribution; japan : motorola japan ltd.; sps, technical information center, 3-20-1, p.o. box 5405, denver, colorado 80217. 1-303-675-2140 or 1-800-441-2447 minami-azabu, minato-ku, tokyo 106-8573 japan. 81-3-344 -3569 technical information center: 1-800-521-6274 asia / pacific : motorola semiconductors h.k. ltd.; silicon harbour centre, 2, dai king street, tai po industrial estate, tai po, n.t., hong kong. 852-26668334 home page : http://www.motorola.com/semiconductors MC33288/d f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
|
