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參數(shù)資料
| 型號(hào)： | L6246 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 12V VOICE COIL MOTOR DRIVER |
| 中文描述： | 12V的音圈電機(jī)驅(qū)動(dòng) |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 103K |
| 代理商： | L6246 |
POWERSUPPLYMONITOR
This circuit monitors the logic supply (5V) and the
power supply (12V) and activates the power on
reset output (POR) and the VCM PARK circuit.
After both logic and power supply reach their
nominal value a timing capacitor (T_CAP) has to
be charge before the POR output change from
low to high level.
POR delay
=
C
V
I
where:
C
is the capacitor value connected at pin
T_CAP
V
is delta voltage that capacitor have to be
charged (2.3V)
I
is the costant current charging the capacitor
(4
μ
A typ.)
At the two input pins, +12 FILTER CAP and + 5
FILTER CAP, can be connected two capacitors
for filtering the noise on the power supply, avoid-
ing in this case undesired commutations of the
POR signal becauseof some fast negativespikes
on theline.
BRAKE AND PARKINGCIRCUITS
The voice coil driver is switched into the parking
condition through the VCM PARK input or when
the POR signal is low. In such condition immedi-
ately the output stage turns on the two lower
DMOS of the power bridge to activate the BRAKE
of the voicecoil motor.
After a delay generated by the capacitor at the
BRAKE DELAY pin, only one of the two lower
DMOS stays on while the opposite half bridge is
tristated.
BRAKE delay
=
C
V
I
where:
C
is the capacitor value connected at pin
BRAKEDELAY
V
is delta voltage that capacitor have to be
charged (3V)
I
is the costant current charging the capacitor
(5
μ
A typ.)
The parking voltage is then supplied by the
PARKING circuit connected to the output that has
been tristated.
The value of such a voltage is set by connecting
an external resistor between the RPARK pin and
ground.
V
r
=
Vbandgap
10
4
Rpark
where:
Vr
is the retract voltagefor parking the heads
Vbandgap
is the internal bandgap reference
voltageof 1.4V
Rpark
is value of the resistor connected at
RPARK pin
The parking circuit takes the power supply from
the spindle driver through the VBEMF pin, so that
in case of power fail the retract of the heads is
possible using the rectified BEMF voltage coming
from the spindle motor.
CHARGEPUMP
The charge pump circuit is usedas a means of al-
most doubling the power supply voltage (12V) in
order to drive the upper DMOS of the power
bridge.
The energy stored in the in the capacitor con-
nected at VCP pin is also used to drive the gate
of the externalN-MOSFET.
GATE DRIVER
This circuit provide the voltage driving the gate of
the external isolation N-MOSFET, and it is con-
trolledby thePOR signal.
THERMAL
The thermal protection circuit has two threshold,
the first if the pre shut down alarm that activates
the THERMAL SD signal and the second is the
shut down temperature that tristates the output
stage when the junction temperature increases
over thislevel.
APPLICATION INFORMATION
Example of calculation of the error amplifier com-
pansation for the stability of the current control
loop. As can be seen from the draw of the current
control loop circuit of the next page, the voltage
across the load is:
#1
V
L
= A
CPW
A
CERR
(A
CINP
V
IN
- A
CENSE
V
sense
)
V
sense
= Rs
I
L
V
L
= ( Z
L
+ Rs)
I
L
where A
C
... is the closed loop gain of Power, Er-
ror, Senseand Input Amplifier.
Changing in the #1 the transfer function between
the load current and the V
IN
is:
#2
I
L
V
IN
=
A
CPW
A
CERR
A
CINP
Z
L
+
R
S
+
A
CPW
A
CERR
A
CSENSE
R
S
L6246
7/12
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