8936 데이터 시트보기 (PDF) - Allegro MicroSystems
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8936 Datasheet PDF : 10 Pages
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8936
VOICE COIL MOTOR DRIVER
TERMINAL FUNCTIONS
"JT" Term."LW" Term. Term. Name Function
25
1
RET REF The reference supply for setting the voltage across the load during retract.
27
2
VFLT
Reservoir (energy storage) capacitor used to operate fault circuitry.
28
3
VBEMF
Back-EMF voltage from spindle motor used to retract heads during loss of power.
30
4
GROUND Circuit reference.
33
5
UVSET
Under-voltage trip point reference input. Set internally to 4.3 V but may be over-ridden by external
resistor divider. (Equation 4).
34
6
ROUT P Source driver used for retract; externally connected to OUTP.
35
7
OUT
Output of uncommitted operational amplifier.
36
8
EN VEL FLT Logic input for over-velocity fault latch.
45
9
INN
Inverting input to uncommitted operational amplifier.
46
10
VELIN
Analog voltage input corresponding to motor speed.
47
11
RETRACT An active-low logic input that initiates the retract sequence.
50
12
FAULT A logic low at this MOS output indicates a thermal shutdown, under-voltage fault, or retract command.
51
13
MPRESET (Power-On Reset) A logic low at this open-collector output may be used to reset the system on
under-voltage fault or power ON.
53
14
SIGNAL SUPPLY VCC; low-current supply voltage in the range of 4.5 V to 5.5 V.
55
15
ACT
Input which controls the current in the load. Transconductance gain is set with an external resistor
in series with this input (Equation 1).
58
16
REFERENCE VREF; reference input for all amplifiers; ac ground.
60
17
H GAIN Logic input to switch the error amplifier transconductance gain: LOW = 2100, HIGH = 8400.
62
18
PWR OFF An active-high logic input that puts the device in a “sleep mode”. All fault circuitry remains active.
1
19
ACTFB
Input connection for feedback network which sets the error amplifier gain and bandwidth.
2
20
SGNDP Power ground for the OUTP sink driver.
4
21
OUTN
Power output. Sinks current when VACT < VREF.
8
22
LOAD SUPPLY VDD; high-current supply voltage for the voice-coil motor.
13
23
OUTP
Power output. Sinks current when VACT > VREF.
15
24
SGNDN Power ground for the OUTN sink driver.
16
25
VSENS FB Input connection for feedback network which sets the current-sense amplifier gain and bandwidth.
Also called gm SET.
19
26
VEL FLT An active-low logic output indicating an over-velocity fault.
21
27
VSENS
Voltage output representing load current (Equation 2). Also called MONITOR.
23
28
RET SET An external resistor divider to set the retract voltage across the load.
Used in conjunction with VRET-REF (Equation 3).
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