M54687FP MITSUBISHI | Alldatasheet
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Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR M 54687FP MITSUBISHI <CONTROL / DRIVER IC> O 2 DES CRIPT IO N The M54687FP is a semiconductor integrated circuit that is capable of directly controlling the rotating direction and rotating speed of a smallsize bi-directional motor rotating in both forward and reverse directions. FEAT URES l Capable of controlling the speed in forward and reverse rotating directions l Capable of controlling the speed in high speed mode l Large output current drive (IO(max) =700mA) l Built-in clamp diode l Flat package (16P2N ) APP LICAT IO N Micro-cassette for phone-answering machine, AV equipment, and other general consumption appliances FUNCT IO N The M54687FP is an IC that can control the forward rotation, reverse rotation and speed of small DC brush motor. For the basic operation of this IC, output modes are selected, as shown in the logic truth table, by entering appropriate H/L level into the R, L and S inputs. Two resistances are put between the output pin and the PSC pin and the resistance ratios are appropriately adjusted to perform the speed control. In addition to the above, speed control can be done by varying the voltage at VR pin, in the high speed mode. Outline16P2N-A Power supply M54687FP B LOC K D IAGR A M Reference voltage Output 2 NC: no connection PSC1 GND L-VCC PSC2 LO G IC TRUT H TABL E Reverse rotation high speed governor Input Output Mode Forward rotation high speed governor O 1 High Speed control Power supply VCC GND Output 1 O 1 Speed control 1 R input S input L input Power supplySpeed control 2 Power supply Output 1 High speed control Output 2 125 116 107 R S L P-VCC O 1 VR GND NC O 2 P-VCC L R H H L H L L H L L H L H H L H L S H H H H L L L L G H H FG L OFF H FG G H L OFF REV FF PLAY REW BRAKE STB Forwardrotation governor Brake operation Standby mode output high imp. Reserved Reverse rotation governor G: Governor control output mode FG: Rotating speed controllable with the voltage at VR pin (However, the precision is worse than G.) 15 10 8 7 9 4 5 12 13 O 2 ( – ) VR Speed control 1 PSC1 Speed control 2 PSC2 Activation circuit Reference voltage Control circuit R input L input S input Constant voltage, Constant current 362 PIN C O N FIG URAT IO N (TO P VIEW) RL S ( – )
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR M 54687FP MITSUBISHI <CONTROL / DRIVER IC> Supply voltage Input voltage P d ABS O LUT E M AXIM UM RAT ING S ( Ta=25°C, unless otherwise noted ) Symbol Ratings UnitParameter Conditions W mA V T opr Continuous outputcurrent T stg Operating temperature -0.5 +14 V V mA -0.5 V CC ±700 ±200 1.14 -20 -40 125 I O V CC V I V O I OP Allowable motor rush current Power dissipation Storage temperature t ON 100ms, duty of 1% or less. V V REC O M M ENDE D O PERAT IN G C O NDITIO N ( Ta=25˚C, unless otherwise noted) Limits Min. Typ. Max. Symbol UnitParameter V CC Supply voltage 6.0 V CC V IH “H” input voltage V IL “L” input voltage V R V R control voltage range 2.0 9.0 13.0 V V Output voltage However, P d must not exceed the maximum rating. When mounted in board -0.5 V CC V CC 0.4 I O 200mA when FF/REW speed is controlled.
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR M 54687FP MITSUBISHI <CONTROL / DRIVER IC> V I = 5.0V V V EL ECT R ICAL CHARACT ERISTICS ( Ta=25°C, unless otherwise noted ) Limits Min. Typ. Max. Symbol Test conditions Unit Parameter I O(leak) “L” output voltage 0.22 V CC = 14V, V O = 14V Standby mode 100 5.0 V CC- 1.2 0.5 1.05 m A V OH V OL V ref “H” output voltage Output leak current Input current Supply current Governor characteristics (I) PLAY REV mode 0.95 1.0 1.7 1.2 0.1 0.02 0.2 m A I I I CC1 I CC2 I CC3 I CC4 I B K V ref V ref V CC K K V CC V ref V ref T a T a K K V ref II V ref V ref T a V ref V ref I O I O K K V ref V ref I O V ref V ref V CC I B I R Governor characteristics (II) FF REW Voltage characteristics FF/REW Output open Output open Output open PLAY/REV BRAKE STAND BY Reference voltage Bias current Current proportional constant Temperature characteristics Current characteristics V R input current Reference voltage Temperature characteristics Current characteristics Bias current Voltage characteristics K V ref K V ref K V ref I O = -200mA, V R = 5.0V I O = 200mA, V R = 0V, V psc = 2.5V FF / REW / BRAKE mode I O = 40mA V CC = 6.0 – 13V V CC = 6.0 – 13V I O = 40mA I O = 50 – 200mA I O = 50 – 200mA T a = -20 – 75˚C T a = -20 – 75˚C V R = 0.3V V R = 0.3V V CC = 6.0 – 13V V R = 0.3V I O = 50 – 200mA V R = 0.3V T a = -20 – 75˚C V R = 0.3V V R = 0V 0.4 mA 1.0 V CC- 0.9 0.7 5.0 0.01 0.01 0.01 2.0 3.0 0.2 0.1 1.3 -5.0 0.7 1.8 -20 mA m A %/˚C %/mA %/V V %/˚C %/˚C %/mA %/V %/V %/mA 8.0 mA V mA mA mA 8.0 10.0
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR M 54687FP MITSUBISHI <CONTROL / DRIVER IC> Motor: Armature resistance R a = 14 , Generation constant K a RT: The resistance of 300 is used for temperature compensation to take measures against hunting at low temperature. Install at a position close to the IC, if possible. m F APP LICAT IO N EXA M PLE
- When the normal speed is set to 2000rpm, and the high speed is set to 3500rpm Reference voltage L-G ( – ) V R PSC1 PSC2 Activation circuit Reference voltage Control circuit R L S Constant voltage, Constant current P-G V CC M O O V CC = 5.0V 20k RT 0.1 m F RT 300 / / 5.6 k V CC = 9.0V RS Control signal ( – ) 3000 2.57
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR M 54687FP MITSUBISHI <CONTROL / DRIVER IC> (3) Speed Control Method III (to increase the precision of forward rotation and reverse rotation) The above two applications cannot make fine adjustments in forward rotation and reverse rotation (because the external resistance is shared with the forward rotation and reverse rotation). Fine adjustments can be made for each of forward rotation and reverse rotation if the external circuit is set as shown in the drawing above. This external circuit is also available to change the speed of forward and reverse rotation. The control method adopts the same formula as formula (1). However, the following relations must be satisfied: RT+RS RS1 or RS2 RT RT1 or RT2 Speed C ontrolM ethod (1) Speed Control Method I (See the application circuit drawing.) For PLAY/REV Rotation number can be expressed by the following formula: N= {IB RT+V ref (1) Where: Motor generation constant: Ka, Motor armature resistance: R a, Rotation number: N K : Current proportional constant, IB: PSC pin bias current, Ia:motor current RT, RS: External resistance In addition, to set the rotation number with RS, external resistance RT is generally set as follows: RT K x Ra For FF/REW Note that the rotation number is basically controlled with the same expression as formula (1) but different reference voltage V ref and different bias current IB are to be used. However, V ref 5VR+0.5 (2) Speed Control Method II (to increase the motor rotation number) In the external circuit above, the voltage across motors is almost determined by the ratio of ‘RS+RT’ to ‘RT’ and, therefore, a value set for the voltage across motors is not so large. As method (1) of speed control I, the rotation number can be controlled. However, the following relations must be satisfied: RT RT+RS RS+RT RT V CC RT RT+RS RT K Ka V R PSC2 PSC1 O O R L S L-G P-G Control signal M Control signal V CC V R PSC2 PSC1 O O R L S L-G P-G M RT1 RS1 RS2 RT2 RS RT RT (1+ )+la( -Ra)}
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR M 54687FP MITSUBISHI <CONTROL / DRIVER IC> CAUT IO NS (1) Oscillation may take place with the setting of RT>K Ra. S et R K Ra. (2) Add a capacitor of 0.1 m F to the portion between PSCs to reduce brush noise of the motor. (3) Add a capacitor of 10 m F to the portion between V CC and GND to reduce brush noise and back electromotive noise of the motor. (4) At a low temperature, RT>K Ra is set due to temperature characteristics of resistance Ra of the motor. When oscillation takes place, use resistance with a temperature coefficient for RT. (5) When the supply voltage is low, note that saturation of the output transistor of the IC may prevent the rotating speed for control.Taking into account motor noise etc., set constants in the following range. 2.0V V CC - (EC+Ia Ra) = V CC - {RT IB + V ref (1+ )+ Ia} When the back electromotive force is large with the brakes applied, for example, malfunction may occur in internal parasitic Di. If flyback current of 1A or more flows, add Schottky Di to the portion between the output and the GND. When the IC is used at a high speed for PWM etc., note that switching of output results in delay of approx. 10 m TYPICAL CHARACT ERISTICS Power Dissipation P d (W) Operating Temperature Ta (˚C) Thermal Derating (Absolute Maximum Rating) 2.0 When mounted in board 25 50 75 100 1.5 1.0 0.5 RT RS RT K