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參數(shù)資料
| 型號： | L9925 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DMOS DUAL FULL BRIDGE DRIVER |
| 中文描述： | 偶的DMOS全橋驅(qū)動器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 81K |
| 代理商： | L9925 |
THERMAL PROTECTION
A thermalprotectioncircuit has been included that
will disable the device if the junction temperature
reaches 150
°
C. When the temperature has fallen
to a safe level the device restarts under the con-
trol of the input and enablesignals.
APPLICATIONINFORMATION
RECIRCULATION
During recirculationwith the ENALBE input high,
the voltage drop across the transistor is R
DS(ON)
.
for voltages less than 0.6V and is clamped at a
voltages depending on the characteristics of the
source-drain diode for greater voltages. Although
the deviceis protectedagainstcrossconduction.
POWERDISSIPATION
eachbridge
In orderto achievethe high performanceprovided
by the L9925 some attention must be paid t en-
sure that it has an adequate PCB area to dissi-
pate the heat. The forst stage of any thermal de-
sign is to calculate the dissipated power in the
application, for this example the half step opera-
tionshown in Fig.6 is considered.
RISE TIMET
R
When an arm of the half bridge is turned on cur-
rent begins to flow in the inductive load until the
maximum current I
L
is reached after a time T
R
,
The dissipatedenergy E
OFF/ON
.
E
OFF/ON
= [R
DS(ON)
I
L2
T
R
]
2
3
ON TIMET
ON
During this time the energy dissipated is due to
the ON resistance of the transistors E
ON
and the
commutationE
COM
. Astwo of the POWER DMOS
transistorsare ON E
ON
isgiven by:
E
ON
= I
L2
R
DS(ON)
2
T
ON
In the commutationthe energydissipated is:
E
CON
= V
S
I
L
T
COM
f
SWITCH
T
ON
Where:
T
COM
=CommunicationTimeanditisassumedthat:;
T
COM
=t
rise
=t
fall
≤
20
μ
s
T
SWITCH
=Chopperfrequency
FALL TIME T
F
For this example it is assumed that the energy
dissipated in this part of the cycle takes the same
form as thatshown for therise time:
E
OFF/ON
= [R
DS(ON)
I
L2
T
F
]
2
3
QUIESCENTENERGY
The last contribution of the energy dissipation is
due to the quiescrent supply current and is given
by:
E
QUIESCENT
= I
QUIESCENT
V
S
T
TOTALENERGYPER CYCLE
E
TOT
= (2
E
OFF/ON
+ E
ON
+ E
COM
)
bridge1
+
+ (2
E
OFF/ON
+ E
ON
+ E
COM
)
bridg2
+ E
QUIESCENT
The totalpower dissipationP
DIS
is simply:
P
DIS
=
E
tot
T
T
R
= Rise time
T
ON
= ON time
T
F
= Fall time
T
OFF
= OFF time
T = Period
T = T
R
+ T
ON
+ T
F
+ T
OFF
T
switch
T
R
T
ON
T
OFF
T
F
I
L
D99AT435
Figure 6.
L9925
7/9
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