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L6256 Datasheet

  • L6256

  • 12V COMBO

  • 28頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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L6256
12V COMBO
DESCRIPTION
The 12 Volt Combo chip is a combination spindle
motor driver, voice coil driver and D/A converter.
The part can be used in,application like HDD.
The VCM amplifiers drive a low impedance coil
and are set up to accept RC compensation, which
allows a wide bandwidth with absolute minimum
phase lag. The sense resistor/amplifier arrange-
ment allows full current loop operation. The loop
gain is changeable by attenuating the VCM DAC
voltage amplitude in cascadable stages.
The Spindle driver is a PWM only voltage loop
with power supply feedforward, driving a 3 phase
sensorless brushless DC motor. Since it uses
PWM operation at full run speed, it has output
slew rate control during start and run modes.
There is an inductive clamp circuit to limit flyback
voltage transients across the supply voltage dur-
ing motor phase changes and during the braking
sequence. Only the 2 phase or bipolar commuta-
tion pattern is produced by the internal commuta-
tion circuitry. A commutation register allows arbi-
Figure 1. Block Diagram
DAC
18
19
CHARGE
PUMP
h_vpwr
-
VCM
LOGIC
+
A
AMP
-
+
B
AMP
h_vpwr
32
IO_VC
31
I_VC
26
A_IN
30
A_OUT
25
VCM CLASS AB
DRIVERS
23
24
VC_PWR
B_OUT
PLCC44
ORDERING NUMBER:
L6256
trary winding sequencing during certain opera-
tions.
Internal protection against crossover
spikes is built in.
3 phase or tripolar commutation can be supported
in software during start by writing a commutation
pattern directly to the preload register.
Tripolar operation requires that more than two
phase drivers contribute current simultaneously.
The current limit circuitry reflects this and allows
33% higher current limit, which produces nearly
CP_OUT
CP_CAP
H_VPWR
33
VPWR
2
34
15
10
9
27
POR
UV
DETECT
10 BIT
DAC
VCM
COMMAND
CHANNEL
VDD
VCC
nPOR
POR_RC
PARK
THERMAL
VCM CONTROL
VCM
RETRACT
PWR GND
SCLK
13
CLK
SYNC
BANDGAP
VOLTAGE
REFERENCE
CURRENT
SOURCES
SDIO
CSELB
14
28
SERIAL INTERFACE
SPINDLE LOGIC
16
BRAKE
DELAY
COUNTER
DYNAMIC
CLAMPING
2
SPINDLE DRIVERS
42
SP_P1
SP_P2
BYPASSC
3
SPINDLE SEQUENCER
43
ANALOG
TEST MUX
24
SYNC
CLAMP
BEMF SENSING
ZERO CROSSING
DETECTION
1
3
41
SP_A
SP_B
SP_C
C_TAP
3
20
21
22
3.3V LINEAR
REGULATOR
FEEDFORWARD
COMPENSATION
upper
QDRIVE
VREG_IN
CUR_IN
lower
PRE-DRIVERS
6,7,17,29,39,40
8
R_
SLEW
11
PWM_
IN
36
PWM_
DC
37
FF_
COMP
5
SP_
CLK
38
12
CURRENT
LIMIT
SENSING
35
REF_
IN
44
SP_
G2
4
SP_
G1
D97IN571
SH_ BEMF_
OUT DET
December 1997
1/28

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