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L6256 Fiches technique(PDF) 2 Page - STMicroelectronics

No de pièce L6256
Description  12V COMBO
Download  28 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6256 Fiches technique(HTML) 2 Page - STMicroelectronics

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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
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
Parameter
Value
Unit
VPWR
Normal Operating Voltage
15
V
VPVR
Inductive Clamp Voltage @ 2mH, 1.6A, 3% Duty Cycle
<20
V (1)
Vdd
15
V
VCC
6.4
V
I_VCM, Aout
-2 to VPWR +2V
Logic I/O, SH_Out, PWM_DC
-0.3 to VCC +0.3
All other pins
-0.3 to VPWR +0.3V
Tstg
Storage Ambient Temperature
-65 to +150
°C
ESD capability
±2kV
(1) Limited by chip clamp voltage.
1
2
3
5
64
7
8
9
10
12
11
13
14
15
16
17
39
38
37
36
34
35
33
32
31
30
29
40
41
42
44 43
23
22
21
19
18
20
28
27
26
24 25
GND
R_SLEW
POR_RC
nPOR
BEMF_DET
PWM_IN
SCLK
SDIO
VCC
BYPASSC
5V_GND
GND
SH_OUT
FF_COMP
PWM_DC
VDD
REF_IN
H_VPWR
DAC
IO_VC
A_IN
GND
D97IN572
PIN CONNECTION
OPERATING CONDITIONS
VCC = 4.5 to 5.5V
Vdd = 10.8 to 13.2V
0°C < Tamb < 70°C.
DESCRIPTION (Continued)
L6256
2/28


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