Obsolete Product(s) - Obsolete Product(s)

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Lee Holland
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1 DUAL SWITCH-MODE SOLENOID DRIER HIGH CURRENT CAPABILITY (up o.5a per channel) HIGH OLTAGE OPERATI (up o 46 for power sage) HIGH EFFICIENCY SWITCHMODE OPERATI REGULATED OUTPUT CURRENT (adjusable) FEW EXTERNAL COMPENTS SEPARATE LOGIC SUPPLY THERMAL PROTECTI BLOCK DIAGRAM OLTAGE REGULATOR THERMAL SHUTDOWN MULTIWATT5 ORDERING NUMBER: L95 DESCRIPTI The L95 is a monolihic inegraed circui in a 5 -lead Muliwa package; i incorporaes all he funcions for direc inerfacing beween digial circuiry and inducive loads. The L95 is designed o accep sandard microprocessor logic levels a he inpus and can drive solenoids. The oupu curren is compleely conrolled by means of a swich-ing echnique allowing very efficien operaion. Furhermore, i includes an enable inpu and dual supplies (for inerfacing wih peripherals running a a higher volage han he logic). The L95 is paricularly suiable for applicaions such as hammer driving in marix priners, sep moor driving and elecromagne conrollers. Obsolee Produc(s) - Obsolee Produc(s) + SS 0 OSCILLATOR + S + S H DRIER H DRIER REF D D4 R S R L 5 4 L DRIER LOGIC CIRCUITS R Q FF S C 9 R R Q FF S LOGIC CIRCUITS L DRIER 4 5 R L D D REF in EN in D0IN50 Ocober 00 /7

2 ABSOLUTE MAXIMUM RATINGS Symbol Parameer alue Uni S Supply volage 50 SS Logic supply volage, EN i Enable and inpu volage 7 ref Reference volage 7 I o CNECTI DIAGRAM THERMAL DATA Peak oupu curren (each channel) - non repeiive ( = 00 µsec) - repeiive (80% on - 0% off; T on = 0ms) - DC operaion P o Toal power dissipaion (a T case = 75 C 5 W T sg, T j Sorage and juncion emperaure - 40 o 50 C TAB CNECTED TO PIN OUTPUT H ch OUTPUT L ch CURRENT SENSING REFERENCE OLTAGE INPUT LOGIC SUPPLY OLTAGE SS OSCILLATOR RC NETWORK GROUND ENABLE INPUT REFERENCE OLTAGE CURRENT SENSING OUTPUT L ch OUTPUT H ch SUPPLY OLTAGE S Symbol Parameer alue Uni R h-j-case Thermal resisance juncion-case max C/W R h-j-amb Thermal resisance juncion-ambien max 5 C/W Obsolee Produc(s) - Obsolee Produc(s) ELECTRICAL CHARACTERISTCS (Refer o he applicaion circui, ss = 5, s = 6; Tj = 5 C; L = Low; H = High; unless oherwise specified) Symbol Parameer Tes Condiion Min. Typ. Max. Uni S Supply olage 46 SS Logic Supply olage D0IN50.5 A A A I d I ss Quiescen Drain Curren (from SS ) Quiescen Drain Curren (from S ) S = 46; i = i = EN = L 4 ma SS = 0 46 ma, i i Inpu olage Low High /7

3 ELECTRICAL CHARACTERISTCS (coninued) Symbol Parameer Tes Condiion Min. Typ. Max. Uni EN Enable Inpu olage Low High I, i I i Inpu Curren i = i = L i = i = H I EN Enable Inpu Curren EN = L EN = H ref, Inpu Reference olage 0. ref I ref, I ref Inpu Reference olage -5 F osc Oscillaor Frequency C =.9 nf; R = 9. KΩ 5 46 KHz I p Transconducance (each ch.) ref =.9. A/ ref ref, Inpu Reference olage 0. ref ref, Inpu Reference olage 0. ref drop sens, sens Toal Oupu olage (each channel) (*) Exernal sensing resisors volage drop (*) drop = CEsa Q + CEsa Q. APPLICATI CIRCUIT D D4 + SS C 0.µF R L I o = A S R L R 9.K D C.9nF Obsolee Produc(s) - Obsolee Produc(s) C 0.µF D C4 0µF R S 0.5Ω + REF + IN R S 0.5Ω EN + + D0IN50 IN REF D, D4 = A High speed diodes rr 00 ns D, D = A High speed diodes rr 00 ns R = R = W L = L = 5 mh FUNCTIAL DESCRIPTI The L95 incorporaes wo indipenden driver channals wih separae inpus and oupus, each capable of driving an inducive load (see block diagram). The device is conrolled by hree micriprocessor compaible digial inpus and wo analog inpus. /7

4 These inpus are: EN chip enable (digial inpu, acive low), enables boh channels when in he low sae. in, in channel inpus (digial inpus, acive high), enable each channel independenly. A channel is acived when boh EN and he appropriae channel inpu are acive. ref, ref referce volages (analog inpus), used o program he peak load currens. Peak load curren is proporional o ref. Since he wo channels are idenical, only channel one will be described. The following descripion applies also he channel wo, replacing FF for FF, ref for ref ec. When he channel is avivaed by low level on he EN inpu and a high level on he channel inpu, in, he oupu ransisors Q and Q swich on and curren flows in he load according o he exponenial law: where: R and R are he resisance and inducance of he load and is he volage available on he load ( s - drop - sense ). The curren increases unil he volage on he exernal sensing resisor, R S, reaches he reference volage, ref. This peak curren, I p, is given by: ref = A his poin he comparaor oupu, omp, see he RS flip-flop, FF, ha urns off he oupu ransisor, Q. The load curren flowing hrough D, Q, R S, decreases according o he law: where A = CEsa Q + sense + D I = e R R L I p If he oscillaor pin (9) is conneced o ground he load curren falls o zero as shown in fig.. A his ime he channel is disabled, by aking he inpus in low and/or EN high, and he oupu ransisor Q is urned off. The load curren flows hrough D and D according o he law: I I R = R T e L R where B = S + D + D I T = curren value a he ime. Fig. in shows he curren waveform obained wih an RC nework conneced beween pin 9 and ground. From o he curren increases as in fig.. A difference exiss a he ime because he curren sars o increase again. A his ime a pulse is produced by he oscillaor circui ha reses he flip. flop, FF, and swiches on he ouou ransisor, Q. The curren increases unil he drop on he sensing resisor RS is equal o ref ( ) and he cycle repeas. The swiching frequency depends on he value R and C, as shown in fig. 4 and mus be chosen in he range 0 o 0 KHz. I is possible wih exernal hardware o change he reference volage ref in order o obain a high peak curren I p and a lower holding curren I h (see fig. ). The L95 is provided wih a hermal proecion ha swiches off all he oupu ransisors when he juncion emperaure exceeds 50 C. The presence of a hyseresis circui makes he IC work again afera fall of R S A I I R A = R p e L R Obsolee Produc(s) - Obsolee Produc(s) B B 4/7

5 he juncion emperaure of abou 0 C. The analog inpu pins ( ref, ref ) can be lef open or conneced o ss ; in his case he circui works wih an inernal reference volage of abou.5 and he peak curren in he load is fixed only by he value of R s :.5 I P = R S SIGNAL WAEFORMS Figure. Wih ref changed by hardware. Figure. Load curren waveform wih pin 9 conneced o GND. I I P i EN REF Q Q 0 D0IN504 Figure. Load curren waveform wih exernal R-C nework conneced beween pin 9 and ground. I I P i EN n Figure 4. Swiching frequency vs. values of R and C. f (KHz) I I p I n i EN REF Q Q 0 0 n D0IN506 D0IN507 Obsolee Produc(s) - Obsolee Produc(s) 5nF 6.8nF.9nF.nF C=nF fo=5khz REF Rmin Q 0 00 R(KΩ) Q D0IN505 5/7

6 DIM. mm inch MIN. TYP. MAX. MIN. TYP. MAX. A B C D 0.09 E F G G H H L L L L L L M M S S Dia OUTLINE AND MECHANICAL DATA Muliwa5 Obsolee Produc(s) - Obsolee Produc(s) 6/7

7 Obsolee Produc(s) - Obsolee Produc(s) Informaion furnished is believed o be accurae and reliable. However, STMicroelecronics assumes no responsibiliy for he consequences of use of such informaion nor for any infringemen of paens or oher righs of hird paries which may resul from is use. No license is graned by implicaion or oherwise under any paen or paen righs of STMicroelecronics. Specificaions menioned in his publicaion are subjec o change wihou noice. This publicaion supersedes and replaces all informaion previously supplied. STMicroelecronics producs are no auhorized for use as criical componens in life suppor devices or sysems wihou express wrien approval of STMicroelecronics. The ST logo is a regisered rademark of STMicroelecronics. All oher names are he propery of heir respecive owners 00 STMicroelecronics - All righs reserved STMicroelecronics GROUP OF COMPANIES Ausralia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Ialy - Japan - Malaysia - Mala - Morocco - Singapore - Spain - Sweden - Swizerland - Unied Kingdom - Unied Saes 7/7

Obsolete Product(s) - Obsolete Product(s)

Obsolete Product(s) - Obsolete Product(s) TURBOSWITCH TM ULTRA-FAST HIGH VOLTAGE DIODE MAIN PRODUCT CHARACTERISTICS IF(AV) VRRM rr (yp) VF (max) FEATURES AND BENEFITS 3 A 1200 V 65 ns 1.7 V SPECIFIC TO THE FOLLOWING OPERATIONS : SNUBBING OR CLAMPING,