參數(shù)資料
型號： L6245
廠商： 意法半導(dǎo)體
英文描述： 5V HARD DISK DRIVE POWER COMBO
中文描述： 5V的硬盤驅(qū)動器電源組合
文件頁數(shù)： 6/15頁
文件大小： 191K
代理商： L6245
ELECTRICALCHARACTERISTICS
(V
S
= 5V, T
j
= 25
°
C; unlessotherwisespecified)
PowerSupplyCharacteristics
Symbol
V
S
ID-READY
Parameter
TestCondition
Min.
4.5
Typ.
Max.
5.5
25
Units
V
mA
Supply Voltage
Quiescent Current Dissipation
V
S
= V
P
= V
CC
No load attached VCM and Spin
drivers enab.
VCM driver disabled Spin driver
enabled
VCM and Spin drivers disabled
ID_IDLE
ID_SLEEP
VCM Driver
(Notes1,2)
20
4
mA
mA
I
OS
Maximum Load Current
(Seeking)
Maximum Load Current
(Traking)
Source & Sink Out ON
Resistance
Sink Out On Resistance
Output Devices A, B, E, F (Fig. 1)
0.3
A
I
OT
Output Devices C, D (Fig. 1)
0.1
A
R
DS(on)
Output Devices A, B, E, F
T
j
= 125
°
C (Fig. 1)
Output Devices C, D
Tj = 125
°
C (Fig. 1)
Parking Device Tj = 125
°
C
I = 0.3A
R
sense
= 2.01
R
sense
= 2.01
R
sense
= 2.01
1
R
DS(on)
2.4
R
DS(on)
V
F
V
jump
V
DB
V
CMOS
Sink Out On Resistance
Body Diode Forward Drop
Jump Discontinuity (**)
Deadband Discontinuity (*)
Offset (***)
12
1.5
30
6
40
V
mV
mV
mV
(*)
The range of input voltages applied to the VCM_CMD pin (with respectto V
) forwhich only negligible currentis present in the load. This
deadband voltage (VDB) can be expressed either in mV or in LSBs, where one LSBis equal to 11.7mV.
(**)
A condition in which the transfer characteristic (i.e., load current vs. VCM_CMD-V
) exhibits a slope which is significantly graterthan the
desired value. The range of currents forwhich this condition exists is termed IJUMP. This current is referred o the VCM_CMD input according
to the following equation: VJUMP = IJUMP x 3 x RSENSE
In thisdocument, RSENSE is assumed to be 2.01
. VJUMP can be expressed either in mV or in LSBs, where one LSB is equal to 11.7mV.
(***)
The value of VCM_CMD (with respect to V
) for which the load current is zero. In parts which exihibit a DEADBAND dicontinuity, the
offset is defined to be at the midpoint of thedeadband region. RSENSE is assumed to br 2.01
.
VCM Current sense amplifier(I
SENSE
)
V
off
Output Offset Voltage
VCM_RS2 Shorted to GND O/S is
V
(Isense)
- V
ref
3V/V nominal
at DC
–50
50
mV
G
Closed Loop Voltage Gain
Power Supply Rejection Ratio
Banwwidth
Output Range
2.85
50
200
–0.2
3.15
V/V
dB
KHz
V
PSRR
BW
V
OR
V
CC
= 4.5V (note 4)
3.5
VCM Full wave rectifying amplifier
I
B
I
imp
Input Bias Current
Input Impedance
VCM_CMD = V
ref
Impedance seen at VCM_CMD
wrt V
ref
2
μ
A
K
5
G
Closed Loop Gain
Power Supply Rejection Ratio
Unity Gain Bandwidth
Input Common Mode Range
Output Range
0.320
50
200
0.3
0
0.347
V/V
dB
KHz
V
V
PSRR
GBW
CMR
V
OR
at DC
VCM_CMD pin
3.7
1
L6245
6/15
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