L6256 查看數據表（PDF） - STMicroelectronics
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L6256 Datasheet PDF : 28 Pages
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L6256
DESCRIPTION (Continued)
constant torque. This is a very high power dissi-
pation mode, meant only for momentary opera-
tion in unusual circumstances.
Spindown during a power failure uses the back
EMF voltage generated by the spindle motor to
provide power to the VCM amplifier. The Spindle
motor coasts during the Brake Delay time to allow
time to park the head actuator. The park circuit is
a constant voltage circuit settable externally.
After the head is parked, braking commences.
The brake operates by shorting all 3 windings.
The spindle output stages stay on as long as is
OPERATING CONDITIONS
VCC = 4.5 to 5.5V
Vdd = 10.8 to 13.2V
0°C < Tamb < 70°C.
required to bring the motor to a complete stop,
even if no power is applied to the part.
A Power On Reset (POR) function provides pulse
stretching for the bidirectional POR\ bus, to en-
sure that the processor and clocks are at running
speed before allowing them to function.
5 volt and 12 volt pins are used directly for the un-
dervoltage detect circuit.
This allows direct use internally of both supplies.
Voltage monitor margining is supported.
An external 3.3V linear regulator is provided and
tied into the POR circuit.
ABSOLUTE MAXIMUM RATINGS
Symbol
VPWR
VPVR
Vdd
VCC
I_VCM, Aout
Logic I/O, SH_Out, PWM_DC
All other pins
Tstg
(1) Limited by chip clamp voltage.
Parameter
Normal Operating Voltage
Inductive Clamp Voltage @ 2mH, 1.6A, 3% Duty Cycle
Storage Ambient Temperature
ESD capability
Value
15
<20
15
6.4
-2 to VPWR +2V
-0.3 to VCC +0.3
-0.3 to VPWR +0.3V
-65 to +150
±2
Unit
V
V (1)
V
V
°C
kV
PIN CONNECTION
2/28
GND
R_SLEW
POR_RC
nPOR
PWM_IN
BEMF_DET
SCLK
SDIO
VCC
BYPASSC
5V_GND
6 5 4 3 2 1 44 43 42 41 40
7
39
8
38
9
37
10
36
11
35
12
34
13
33
14
32
15
31
16
30
17
29
GND
SH_OUT
FF_COMP
PWM_DC
REF_IN
VDD
H_VPWR
DAC
IO_VC
A_IN
GND
18 19 20 21 22 23 24 25 26 27 28
D97IN572
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