參數(shù)資料
型號： LM621
廠商： National Semiconductor Corporation
英文描述： LM621 Brushless Motor Commutator
中文描述： LM621無刷電機(jī)換向器
文件頁數(shù)： 3/12頁
文件大小： 224K
代理商： LM621
Electrical Characteristics
(See Notes) (Continued)
Parameter
Conditions
Typ
Tested
Limits
Design
Limits
Units
DEAD-TIME SECTION
High Level Input Voltage
DIRECTION:
OUTPUT INHIBIT:
DEAD-TIME ENABLE:
Pin 3
e
0V
2.0
2.0
2.0
2.0
2.0
2.0
V min
V min
V min
Pin 17
e
0V
High Level Input Current
DIRECTION:
OUTPUT INHIBIT:
DEAD-TIME ENABLE:
V
in
e
5V
Pin 3
e
0V
100
60
200
150
100
300
m
A max
m
A max
m
A max
Low Level Input Voltage
DIRECTION:
OUTPUT INHIBIT:
DEAD-TIME ENABLE:
Pin 3
e
0V
0.6
0.6
0.3
0.4
0.4
0.2
V max
V max
V max
Low Level Input Current
DIRECTION:
OUTPUT INHIBIT:
DEAD-TIME ENABLE:
V
in
e
0.6V
V
in
e
0.6V
V
in
e
0V
b
100
b
60
b
200
b
150
b
100
b
300
m
A max
m
A max
m
A max
Propagation Delays
(Inputs to Outputs)
OUTPUT INHIBIT
DIRECTION
Dead-Time Off,
(Pin 3
e
0V)
200
200
ns
ns
Minimum Clock Period,
T
CLK
(Notes 3, 11)
R
e
11 k
X
, R
1
e
1k
C
e
200 pF
1.8
m
s
Clock Accuracy
f
e
100 kHz (Note 11)
R
e
30k, R
1
e
1k
C
e
420 pF
g
3
%
Minimum Dead-Time
Minimum Dead-Time
Dead-Time Off
Dead-Time On
15
2
ns
T
CLK
COMPLETE CIRCUIT
Total Current Drains
I
CC1
I
CC1
I
CC2
I
CC2
Outputs Off
10
22
mA min
mA max
15
30
V
CC2
e
40V
2
6
mA min
mA max
3
9
Undervoltage Lockout
V
CC1
Note 1.
Unless otherwise noted ambient temperature (T
A
)
e
25
§
C.
Note 2.
Unless otherwise noted: V
CC1
e a
5.0V, ‘‘recommended operating range V
CC
e
4.5V to 5.5V’’ V
CC2
e a
10.0V, ambient temperature
e
25
§
C.
Note 3.
The clock period is typically T
CLK
e
(0.756
c
10
b
3
) (R
a
1) C, where T
CLK
is in
m
s, R is in k
X
, and C is pF. Also see selection graph in Typical
Characteristics for determining values of R and C. Note that the value of R should be no less than 11 k
X
and C no less than 200 pF.
3.6
3.0
V
MAX
Note 4.
Tested limits are guaranteed and 100% production tested.
Note 5.
Design limits are guaranteed (but not 100% production tested) at the indicated temperature and supply voltages. These limits are not used to calculate
outgoing quality levels.
Note 6.
Specifications in
boldface
apply over junction temperature range of
b
40
§
C to
a
85
§
C.
Note 7.
Typical Thermal Resistances
O
JA
(see Note 8):
N pkg, board mounted
110
§
C/W
N pkg, socketed
118
§
C/W
Note 8.
Package thermal resistance indicates the ability of the package to dissipate heat generated on the die. Given ambient temperature and power dissipation,
the thermal resistance parameter can be used to determine the approximate operating junction temperature. Operating junction temperature directly effects
product performance and reliability.
Note 9.
This part specifically does not have thermal shutdown protection to avoid safety problems related to an unintentional restart due to thermal time constant
variations. Care should be taken to prevent excessive power dissipation on the die.
Note 10:
Human body model, 100 pF, discharged through a 1500
X
resistor.
Note 11:
R
1
e
0 for C
t
620 pF.
3
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