AN8387

AN8387S PANASONIC | Alldatasheet

Document overview

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Technical content

The AN8387S is an IC which incorporates 2 circuits of BTL drivers for driving various DC motors such as actua- tors (focus, tracking traverse), spindles, and loading of the CD players. n Features

• Operating supply voltage range ; VCC =3.5V to 9V PV CC =1.5V to 9V
• Built-in 2 circuits of voltage driven BTL drivers (maximun drive current : 500mA)
• Quiescent current (current consumption at no input) ; 3.2mA
• Provided with power control pin
• Provided with driver output voltage limiting pin
• Built-in thermal protective circuit (operating temperature : 160°C typ.) n Applications Linear driving of the DC motors and actuators of the CD players. CD radio cassette tape recorders, and so on. AN8387S 2-channel Linear Driver Unit : mm 0.1–0.1 2.05–0.2 (0.4)1 0.4–0.251.27 12.63–0.3 5.5–0.3 7.6–0.3(0.4) 0.9–0.25 0.2 + 0.1– 0.05 0.9–0.25 20-Lead SOP Package (SOP020-P-0300A) 8 9 4 3 2 c 14 13 17 18 a b –+ –+ GND V CC P.VCC P.GND Base Current Control BTL Absolute Value Thermal Shutdown V REF SW Base Power Control Absolute Value BTL 10kΩ 1kΩ a) VCC : Pin1, Pin10 b) P.VCC : Pin12, Pin19 c) PGND : Pin5, Pin6, Pin15, Pin16 n Block Diagram

ICs for CD/CD-ROM Pla yerAN8387S V C C PD Topr Tstg Supply V oltage Pow er D issipation O perating A m bient Tem perature Storage Tem perature V m W Param eter Sym bol R ating U nit 1,200 N ote) –30 ~ +85 –55 ~ +125 N ote) W hen m ounted onto the glass epoxy PC B (50m m × 50m m × 0.8m m ) n Absolute M axim um R atings (Ta=25˚C ) Param eter Sym bol R ange O perating Supply V oltage R ange V C C P.V C C 3.5V ~ 9V 1.5V ~ 9V n R ecom m ended O perating R ange (Ta=25˚C ) C urrent C onsum ption at N o Input (V C C ) C urrent C onsum ption at N o Input (PV C C ) PV C C Leak C urrent V ref Threshold (H ) N ote 1) V ref Threshold (L) N ote 2) Input A m p. Input Im pedance D river Input O ffset V oltage N ote 3) D river O utput O ffset V oltage N ote 3) D river D ead Zone W idth N ote3) D river Transfer G ain (+) N ote3) D river (+), (–) Transfer G ain R atio N ote 3) D river O utput V oltage D river O utput V oltage A bsolute V alue D river Pow er Transistor Saturation V oltage PC Input Pin Threshold V oltage (H ) N ote 4) PC Input Pin Threshold V oltage (L) N ote 5) Protective D iode Forw ard V oltage Therm al Protective C ircuit O perating Tem perature IV C C Q IPV C C Q IPV C C L V refH V refL R A IN V I offset V O offset |V D Z| G + R G V O LG |V O L| V sat V PC TH H V PC TH L V PD TTH D V C C =9V , V ref=4.5V , PV C C =9V V C C =9V , V ref=4.5V , PV C C =9V V C C =0V , V ref=O PEN , PV C C =10V V C C =3V , PV C C =10V , V IN =0V V C C =3V , PV C C =10V , V IN =0V V C C =9V , V ref=4.5V , PV C C =9V V C C =9V , V ref=4.5V , PV C C =9V V C C =9V , V ref=4.5V , PV C C =9V V C C =9V , V ref=4.5V , PV C C =9V V C C =9V , V ref=4.5V , PV C C =9V 0.7 1.45 0.75 –10 –55 –10 –1.9 –130 2.25 2.8 0.9 1.2 15.1 – 0.9 0.29 1.5 160 3.5 3.5 1.25 0.5 130 0.38 0.8 1.8 m A m A µA V V kΩ m V m V m V dB dB m V V V V V V Param eter Sym bol C ondition m in. typ. m ax. U nit n Electrical C haracteristics (Ta=25˚C ) V C C =9V , V ref=4.5V , PV C C =9V , V LIM =0V IO =300m A V C C =9V , V ref=4.5V , PV C C =9V , V LIM =3V V C C =9V , V ref=4.5V , PV C C =9V , IO =300m A V C C =9V , V ref=2.5V , PV C C =5V , V IN =2.3V V C C =9V , V ref=2.5V , PV C C =5V , V IN =2.3V V C C =5V , V ref=2.5V , V IN =2.4→ 2.6V N ote1) V ref voltage required to operate the driver. N ote2) If V ref is m ade low er than this voltage, the driver dose not operate. N ote3) R efer to the driver input/output characteristics chart. N ote4) If the PC pin voltage is m ade higher than this voltage, there w ill be no output voltage from the driver. B oth (+) and (–) outputs are pulling in the current. N ote5) If the PC pin voltage is m ade low er than this voltage, the driver operates norm ally.

ICs for CD/CD-ROM Pla yer AN8387S 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 M M A N 8387S P V C C V C C Error Signal1 V R EF Error Signal2 n Pin D escriptions D escriptionEquivalent C ircuitD C V oltagePin N o. Sym bol

10 V C C

I 4.8V 2 IN 1 I 2.5V 9 IN 2 I 2.5V

3 PC 1 I 0V

8 PC 2 I 0V

V C C pin. N ot connected to the PV C C pin. E rror signal input pin for the channel-1 driver E rror signal input pin for the channel-2 driver Input pin for the PC (inter-output voltage of the channel-1 driver O FF) Input pin for the PC (inter-output voltage of the channel-2 driver O FF) 1kΩor 50kΩ100kΩ 1kΩ or O perational am plifier is of PN P differential input n Application Circuit

ICs for CD/CD-ROM Pla yerAN8387S n Pin D escriptions (C ont.) D escriptionEquivalent C ircuitD C V oltagePin N o. Sym bol V ref I/O I 2.5V P.G N D O 0V

7 G N D O 0V

11 V LIM 2 I V C C

20 V LIM 1 I V C C

V LIM pin for the channel-2 driver. U sed w hen lim iting the output voltage of the pins 13 and 14

4 V ref input pin

P.G N D pin G N D pin V LIM pin for the channel-1 driver. U sed w hen lim iting the output voltage of the pins 17 and 18 19 PV C C I 3V Pow er V C C pin. Supplies the driver current. 30kΩ 40kΩ PG N D or V C C PV C C PG N D × 2

ICs for CD/CD-ROM Pla yer AN8387S D escriptionEquivalent C ircuitD C V oltagePin N o. Sym bol D 2+ I/O O (2.7V ) 14 D 2– O (0.3V ) 17 D 1– O (0.3V ) 18 D 1+ O (2.7V )

13 N on-inverting output pin

Inverting output pin for the channel-2 driver Inverting output pin for the channel-1 driver N on-inverting output pin for the channel-1 driver or or PV C C PG N D n Pin D escriptions (C ont.)

• O perational D escription The A N 8387S incorporates the tw o channels of drivers. Since both channels have the identical functions, the follow ing describes the channel-1 driver.
• Block D iagram (C hannel 1 driver) A n error signal (V IN ) input to the pin2 is converted into the absolute value input current IA through the error am plifier and current absolute value circuit. The value of IA is as follow s. R IN 17 18 D irection D ecision SW .A SW .B SW .C IA IA IA V ref S.W A Therm al Shutdow n PC SW .A SW .B IA =0 SW .B SW .C Q 1 Q 2 R 1 57.6 kΩ R 2 57.6 kΩ SW . C Q 3 1kΩ 4 3 Q 4 – + PV C C V LIM C urrent A bsolute V alue C ircuit (R L=8.2Ω ) Error A m p. n Supplem entary Explanation V ref (= V C C )

ICs for CD/CD-ROM Pla yerAN8387S IA = R IN +1kΩ |V IN –V ref | (V + –V –) = R IN +1kΩ 57.6kΩ (V IN –V ref) G = (V + –V –) (V IN –V ref) 1kΩ + R IN 57.6kΩ= –V – | is lim ited w ithin the follow ing range. W hen the pin20 is short-circuited to G N D , |V + –V – | ≤ 130m V results regardless of an input error signal (V IN ). If the pin20 is prepared to short-circuit to G N D at pow er-on of the set, it can be used to prevent operation error at pow er-on of the m otor or actuator. W hen the pin20 is not used, short-circuit it to the pins1 and 10. The pin3 is a PC pin. If a voltage of 2.8V or m ore is applied to this pin, SW .B and SW .C are turned on, IA becom es 0m A , and the base current flow s to the bases of Q 3 and Q 4 sim ultaneously to turn on Q 3 and Q 4. A s a result, the pins17 and 18 are alm ost short-circuited to P.G N D . T his IC incorporates the therm al shutdow n circuit. If the chip tem perature of the IC com es to about 160˚C , both drivers of the tw o channels are turned off. (the output pins17, 18, 14, and 13 are short-circuited to P.G N D ) Sim ilarly, if the applied voltage (V ref) of the V ref pin4 com es to 1V or less, both drivers of the tw o channels are turned off. The output voltage V _ of the pin17 and V + of the pin18 can be lim ited by applying a voltage to the V LIM pin20. For exam ple, if a voltage of 3V is applied to the pin20 w hen V C C = 9V and R L = 8.2Ω , the m axim um value of |V + W hen M ounted to PC B : A m bient Tem perature Ta (˚C ) Pow er D issipation PD (m W ) 0 20 40 60 80 100 120 140 200 400 600 800 1000 1200 1400 1600 1800 2000 M aterial. G lass Epoxy PC B . Size… 5cm × 5cm × 0.8m m θj– a=83.3˚C /W – 0.25VC – B 1 B 2 |V D Z| 4.43V 4.45V 0.25V V IO F V 1, V 2 O utput B 4 G – B 5 Input 4.5V B 3 4.55V 4.57V V IN V C C = 9V P.V C C = 9V V ref = 4.5V V O O F G + = B 5–B 4 20m V G – = B 2–B 1 20m V R G = G + G –

• D river Input/O utput C haracteristics Input O ffset (V IO F) O utput O ffset (V O O F) D ead Zone (|V D Z|) Transfer G ain (+) (G +) (+), (–) Transfer G ain R atio (R G )
• C haracteristics C urve PD –Ta , , Therefore, the driver’s gain G w ill be as follow s. (w hen the m otor load R L is 8.2Ω ) 1) W hen V IN >V ref, the direction determ ining circuit operates so that the follow ing conditions are m et. SW .A : SW .B : O N SW .C : O FF 2) W hen V IN <V ref, the direction determ ining circuit operates so that the follow ing conditions are m et. SW .A : SW .B : O FF SW .C : O N The output (V +–V –) betw een the pins18 and 17 has the follow ing relation w ith the input (V IN –V ref) betw een the pins 2 and 4.