AN8819

AN8819NFB PANASONIC

Document overview

• Manufacturer or author: Provided By digicamel.com
• PDF pages: 11

Technical content

The AN8819NFB is a 4ch. driver employing the low consumption power type H-bridge method which can operate with low voltage. It is suitable particularly for a portable CD player. n Features

• Wide output D-range is available regardless of the ref- erence voltage on the system
• Driver input/output gain setting enabled by an external resistance
• For 2 channels, independent power on/off feature built- in. For other 2 channels, simultaneous on/off feature provided.
• Thermal shut down circuit (with hysteresis) built-in
• PWM control of the driver supply enabled by an exter- nal circuit for low consumption power operation
• Construction of DC-DC converter enabled by an exter- nal circuit
• Construction of ripple filter for D/A converter enabled by an external capacitor
• Construction of PWM control circuit of laser output by an external circuit for low consumption power operation
• Reset circuit with a mute and battery voltage detection circuit built-in for rational design of a set n Application Actuator for CD, motor drive AN8819NFB 4Ch. Linear Driver IC + DC-DC Converter Control for CD Unit : mm 11 1 33 23 0.3 + 0.1 – 0.050.8 10.0–0.3 12.2–0.4 12.2–0.4 10.0–0.3 (0.6) 0.1–0.1 2.0–0.3 0.9–0.1 0.9–0.1 0.2 + 0.1 – 0.05 44-lead QFP package (QFP044-P-1010)

AN8819NFB ICs for CD/CD-ROM Pla yer n Block Diagram B TL B TL B TL B TL 26 25 24 23 29 30 31 32 28 27 6 357 15 16 17 18 19 20 21 22 34 33 36 37 39 41 9 13 12 11 5 4 8 2 PO W ER O FF PW M +– +– +– +– M ax. V alue A bsolute V alue R ipple Filter D C -D C C onv. Sw itching C ircuit Starter exchange Initial setting Therm al Shutdow n Starter A bsolute V alue A bsolute V alue A bsolute V alue D R V C C SV C C PG N D SG N D PV C C

ICs for CD/CD-ROM Pla yer AN8819NFB n Pin D escription Pin N o. Pin N am e PV C C Supply Pin D ED D ead Tim e Input Pin O U T D C -D C C onverter O utput Pin FB Error A m p. Input Pin IN Error A m p. O utput Pin D R G N D G round Pin SG N D G round Pin SPR O Short-C ircuit Protection Input Pin B SEL Em pty D etection Level C hangeover Pin V SEN Em pty D etection Input Pin SV C C Pow er Pin C R IP C apacitor Pin for R ipple R ejection A V D D R ipple Filter O uput Pin D R V C C Supply Pin V R EF 1/2 V C C Input Pin IN FO D river Input Pin IN TR D river Input Pin LD O N D river O N – O FF C ontrol Pin IN SP D river Input Pin PC D river O N – O FF C ontrol Pin IN TV D river Input Pin TR V STO P D river O N – O FF C ontrol Pin Pin N o. Pin N am e TR – D river O utput Pin TR + D river O utput Pin FO – D river O utput Pin FO + D river O utput Pin PG N D G round Pin PG N D G round Pin SP + D river O utput Pin SP – D river O utput Pin TV + D river O utput Pin TV – D river O utput Pin V C D river Pow er V oltage Pin TB PW M C ircuit O utput Pin R ESET R eset O utput Pin M R ST M uting R eset O utput Pin EM P Em pty D etection O utput Pin C LK External Synchronization Input Pin STA R T Start O scillation Start Input Pin PO W ER Pow er O n/O ff Input Pin C T Triangular W ave O scillation Pin PW M G PW M Loop G ain A djustm ent Pin C O M PO A PC C om parator O utput Pin C O M PI A PC C om parator Input Pin n Absolute M axim um R atings (Ta=25˚C ) PV C C SV C C D R V C C V 10m ax. V 33m ax. IC C PD Topr Tstg Supply V oltage V SEN Pin M axim um A pplied V oltage V C Pin M axim um A pplied V oltage Supply C urrent Pow er D issipation N ote) O perating A m bient Tem perature Storage Tem perature V V V m A m W Param eter Sym bol R ating U nit 880 –25 ~ + 75 –55 ~ + 125 N ote) U nit n R ecom m ended O perating R ange (Ta=25˚C ) Param eter Sym bol R ange O perating Supply V oltage R ange PV C C SV C C D R V C C 1.5V ~ 9V 2.7V ~ 5.5V 2.7V ~ 5.5V

AN8819NFB ICs for CD/CD-ROM Pla yer Param eter Sym bol C ondition m in. typ. m ax. U nit n Electrical C haracteristics (Ta=25˚C –2˚C ) D river Portion V D M A X ID M A X G + G sp + V O FF V SPO FF ID Z ISpD Z V m A kΩ kΩ m V m V µA µA 2.0 1.8 1.8 4.5 3.0 5.1 2.0 SV C C N o Load Supply C urrent D R V C C N o Load Supply C urrent PV C C N o Load Supply C urrent PV C C Leak C urrent I11Q I14Q I1Q I1L PV C C = 2.4V , SV C C = D R V C C = 3.2V , V R EF = 1.6V 3.1 2.4 2.6 m A m A m A µA 500 –50 –100 D R V C C –1.2 107 100 M axim um D rive V oltage of Pins FO , TR , SP and TV R ipple R ejection R atio R R 13 40 dB PV C C = 4V , SV C C = D R V C C = 3.2V PV C C = 4V , SV C C = D R V C C = 3.2V PV C C = 4V , SV C C = D R V C C = 3.2V PV C C = 4V , SV C C = D R V C C = 3.2V PV C C = 4V , SV C C = D R V C C = 3.2V PV C C = 4V , SV C C = D R V C C = 3.2V PV C C = 4V , SV C C = D R V C C = 3.2V D C -D C C onverter Portion V V kH z kH z 1.5 0.3 PV C C = 2.4V , SV C C = D R V C C = 3.2V , C T = 390pF/470kΩ , V IN = 0.8V 1.08 0.15 1.71 0.4 115 PV C C 1 = 2.4V , SV C C = D R V C C = 3.2V , V R EF = 1.6V PV C C 1 = 2.4V , SV C C = D R V C C = 3.2V , V R EF = 1.6V PV C C = 9V , SV C C = D R V C C = 0V , V ER F = 0V M axim um D rive C urrent Focus/Tracking/Traverse Transm ission G ain (+) Spindle Transm ission G ain (+) Focus/Tracking/Traverse O utput O ffset V oltage Spindle O utput O ffset V oltage Focus/Tracking/Traverse Input C onversion D ead Zone Spindle Input C onversion D ead Zone PV C C = 4V , SV C C = D R V C C = 3.2V D 2C D 2F D 2S V 20H V 20L F41S F41F PV C C = 2.4V , SV C C = D R V C C = 3.2V , C T = 390pF/470kΩ , V IN = 0.8V PV C C = 2.4V , SV C C = D R V C C = 3.2V , C T = 390pF/470kΩ , V IN = 0.8V PV C C = 2.4V , SV C C = 3.2V IO U T = –25m A , V C T = 0V , V FB = 0.7V PV C C = 2.4V , SV C C = D R V C C = 3.2V , IO U T = 15m A , V C T = 1V , V FB = 0.5V PV C C = 3.2V , SV C C = 0V C T = 390pF/470kΩ PV C C = 2.4V , SV C C = D R V C C = 3.2V , C T = 390pF/470kΩ PV C C = 2.4V , SV C C = D R V C C = 3.2V , Input = 35m V rm s/20kH z R ipple Filter Portion C LK Synchronization O utput Pulse M axim um D uty Self-R unning O utput Pulse M axim um D uty Starting O utput Pulse M axim um D uty Self-R unning O utput V oltage (H ) Self-R unning O utput V oltage (L) Starting O scillation Frequency Self-R unning O scillation Frequency

ICs for CD/CD-ROM Pla yer AN8819NFB n Pin D escription Pin D escription Equivalent C ircuitPin N o. Sym bol I/O SV C C SG N D D R V C C D R G N D PV C C PG N D D ED O U T I I I I I I O Supply pin for control circuits other than of driver, not connected w ith D R V C C , PV C C G round pin for control circuits other than of driver Supply pin for control circuit of driver, not connected w ith SV C C , PV C C G round pin for control circuit of driver Supply pin supplying the current for output pow er transistor G round pin for output pow er transistor Setting pin for dead tim e control input and soft start Sw itching output pin 50kΩ 200Ω 15kΩ 25kΩ SV C C PV C C

AN8819NFB ICs for CD/CD-ROM Pla yer n Pin D escription (C ont.) Pin D escription Equivalent C ircuitPin N o. Sym bol I/O FB IN SPR O PO W ER A V D D C R IP O I I I O Error am p. output pin Error am p. input pin Short-circuit protection input pin Sw itching output O N /O FF pin Supply pin for D /A converter External capacitor pin for ripple rejection SV C C SV C C26.9kΩ 13.1kΩ 16.4kΩ 22kΩ 20kΩ 79kΩ 62kΩ 32kΩ SV C C SV C C

ICs for CD/CD-ROM Pla yer AN8819NFB n Pin D escription (C ont.) Pin D escription Equivalent C ircuitPin N o. Sym bol I/O Pow er cut input pin for D rivers FO , TR . D river output at L = G N D V R EF IN FO IN TR IN SP IN TV LD O N PC TR – TR + FO – FO + SP – SP + TV – TV + V C TR V STO P I I I I I I I I O O O O O O O O O V R EF input pin Input pin for D river FO Input pin for D river TR Input pin for D river SP Input pin for D river TV Pow er cut input pin for D river SP. D river output at H = G N D Pow er cut input pin for D river TV . D river output at H = G N D D R V C C D R V C C D R V C C 100kΩ 1kΩ 1kΩ 40kΩ 80kΩ D R V C C 86kΩ 86kΩ or or or or 24 26or 31or or 23 25or 32or or V R EF – output pin of D river TR + output pin of D river TR – output pin of D river FO + output pin of D river FO – output pin of D river SP + output pin of D river SP – output pin of D river TV + output pin of D river TV D river supply pin

AN8819NFB ICs for CD/CD-ROM Pla yer n Pin D escription (C ont.) Pin D escription Equivalent C ircuitPin N o. Sym bol I/O B attery shortage detection output pin for battery voltage detection circuit R eset output pin. R eset voltage = O utput voltage × 90% B SEL V SEN EM P STA R T M R ST R ESET Pin sw itching the dry cell and charger battery for battery voltage detection circuit B attery voltage detection input pin for battery voltage detection circuit M uting reset output pin. R eset voltage = O utput voltage × 90% Start pin. O U T pin starts sw itching in start m ode PV C C 30kΩ 7.8kΩ 9.9kΩ 7kΩ 70kΩ PV C C PV C C PV C C 200kΩ 100kΩ PV C C 20kΩ 60kΩ 40kΩ I I I O O O

ICs for CD/CD-ROM Pla yer AN8819NFB n Pin D escription (C ont.) Pin D escription Equivalent C ircuitPin N o. Sym bol I/O C lock input pin, used to synchro- nize the triangular w ave oscillation w ith clock. C LK C T TB PW M G C O M P0 C O M P1 I O O O I T riangular w ave oscillation pin. O scillation frequency determ ined by external R and C . R ecom m endable values : 470kΩ , 390pF Transistor base pin for controlling the driver supply voltage PW M G ain adjustm ent pin for controlling the driver supply voltage PW M A PC sw itching com parator output pin A PC sw itching com parator input pin 50kΩ 20kΩ 50kΩ 160kΩ PV C C 60kΩ D R V C C SV C C 1kΩ

AN8819NFB ICs for CD/CD-ROM Pla yer n Characteristic Curve 2,000 1,800 1,600 1,400 1,200 1,000 800 600 400 200 A m bient Tem perature Ta (˚C ) Pow er D issipation PD (m W ) 250 75 125 G lass epoxy board (50m m × 50m m × 0.8m m ) R thj– a = 70˚C /W PD =1786m W (25˚C ) 15010050 1,786 880 U nit R thj– a = 142˚C /W PD = 880m W (25˚C ) PD –Ta n D escription for use

• D river Portion Set the driver gain calculated by the equation show n below , except for SP driver. For SP driver, the gain m ust be set to the calculated value + 6dB . G = 43kΩ 1.0kΩ + R The total channel driver supply is Pin33. Set the driver supply as necessary, since the output am plitude increases w ith increase of the supply voltage. H ow ever, also increase the voltage of D R V C C pin (Pin14) at the sam e tim e. A s protection functions, V R EF detection and heat protection circuits are incorporated. V R EF detector sets the driver output to high im pedance, w hen the voltage applied to V R EF is 0.75V or less. For the heat protective circuit, the set tem perature for operation is approx. 150˚C and the release tem perature is approx. 120˚C . FO and TR drivers have the built-in function for m aking short-circuit betw een either loading end and G N D by LD O N (Pin18), and for SP and TV drivers by PC (Pin20) and TR V STO P (Pin22). LD O N : O utput G N D at L PC : O utput G N D at H TR V STO P : O utput G N D at H R : External input resistance

ICs for CD/CD-ROM Pla yer AN8819NFB R 2 R 3 IC Inside 1.25V EM P V SEN ’ R 1 V SEN SV C C R 1 R 2 IN R 3 R 4 1.11V FB

• D C -D C C onverter Portion 3.4V regulator can be constructed by using external com ponents. The output voltage can be m ade variable by using an external resistance. The short-circuit protective function stops sw itching of O U T pin (Pin3), unless the output of error am plifier (Pin4) reaches L after H , w ithin t = C SPR O × V TH /ISPR O (V TH = 1.1V ISPR O = 30µA ). (It is recom m ended that an electrolytic capacitor of 4.7µF around should be used for Pin3.) The soft start function w orks by attaching a capacitor to Pin2 for G N D . t = C D ED × R (R = 60kΩ ) A lso, M A X duty can be changed by attaching an external resistance to Pin2. The output voltage is determ ined as follow s: (Exam ple) A ssum ing R 1 + R 2 = 50kΩ R 1 × R 3 + R 2 × R 4 R 1 + R 3 R 2 + R 4 SV C C = 1.1 × R 2 × R 4 R 2 + R 4 W here R 3 = 26.9kΩ R 4 = 13.1kΩ
• R ipple Filter Portion for D A C onverter (R ipple Filter of Low Saturation Voltage Type) A ttach a capacitor for noise rem oval to C R IP pin for G N D . (A capacitor of 22µF around is recom m ended.) O utput current : 10m A (typ.)
• Battery Voltage D etection C ircuit The voltage applied to V SEN pin (Pin10) and the constant voltage are com pared for output to EM P pin (Pin37). There is approx. 50m V of hysteresis from detection to reset to prevent the output chattering. The detection threshold voltage can be m ade variable by an external resistance. The threshold values w ith no external resistances at V SEN pin (Pin10) are as follow s: D etection : V SEN = 2.2V (typ.) B SEL (Pin9) = L R eset : V SEN = 2.25V (typ.) B SEL (Pin9) = L D etection : V SEN = 1.8V (typ.) B SEL (Pin9) = H iZ R eset : V SEN = 1.85V (typ.) B SEL (Pin9) = H iZ U se the follow ing equation as reference to determ ine the detection threshold voltage: A ssum ing that the voltage of V SEN (Pin10) at battery shortage detection is V SEN ’ V SEN ’ = R 1 + R 2 + R 3 × 1.25R 3 W here R 1 : External R esistance R 2 : 8.0kΩ R 3 : 16.5kΩ (B SEL = H iZ) R 3 : 10.5kΩ (B SEL = L)
• R ESET and M R ST Portions R ESET (Pin35) is changed from L to H , and M R ST pin is changed from H to L, w ith approx. 90% of the output voltage by a D C - D C converter. IC Inside