STA530 데이터 시트보기 (PDF) - STMicroelectronics
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STA530 Datasheet PDF : 17 Pages
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STA530
In fig. 2 there is the power protection strategy pic-
tures. Under the curve of the 18W power, the chip is
in normal operation, over 30W the chip is forced in
Standby. This last status would be reached if the
Buck regulator does not respond quikly enough re-
ducing the stress to less than 30W.
The fig.3 gives the protection current, Iprot(PD), be-
havior. The current sourced by the pin Prot follows
the formula:
Iprot(P D) ≡ -(--P----d----–-----P----d---_---1a---.v--2-_--5-t--h-V--)----⋅---5-----⋅---1---0----–---4-
(for each channel)
for Pd < Pd_av_th the Iprot(PD)= 0.
Figure 2. Power protection threshold
Ids(A)
Ilim=4.5A
5.0
4.5
4.0
3.5
3.0
Standby
2.5
Pd_Max=30W
2.0
1.5
1.0
Normal mitation
Operation
Pd_reg=18W
0 7.5 15.0 22.5 30.0 37.5 D02AU1366
Vds(V)
Figure 3. Protection current behaviour Iprot (PD)
Iprot (IPd) (mA)
CURRENT PROTECTION
The chip is also protected by a current detection.
The current ILOAD is compared with the reference
current ILIMP, if bigger (ILOAD> 4,5 A)a current Ip-
rot(IL), is supplied to the Protection pin.
As further protection, when ILOAD reaches an higher
threshold (5 A) the chip is shut down, forcing low the
Stby/Mute pin, and the turn on sequence is restarted.
The above description is relative for each channel in
4x30W configuration.
The fig.4 gives the protection current, Iprot(IL), be-
havior. The current sourced by the pin Prot follows
the formula:
Iprot(IL)
≡
(---I--L---O----A----D-----–----I--i--c--t--,--s---)-
2500
(for each channel)
for IlLOAD < Iict,s the Iprot(IL) = 0.
For the parallel channel Iprot is double.
The chip is also shut down in the following conditions:
When the average junction temperature of the chip
reaches 150°C.
When the ground potential differ from more than 5V
from the half of the power supply voltage, ((CD+)-
(CD-))/2
When the sum of the supply voltage |Vs+| + |Vs-|
<20V
The output bridge is muted when the average junc-
tion temperature reaches 130°C.
Figure 4. Protection current behaviour Iprot (IL)
Iprot(IL)(µA)
20
Iprot slope = 0.4 mA/W
10
800
Iprot slope=400µA/A
:
Pd (W)
5
10 15 20 25 30
400
4.5A
5A
D02AU1367
1
2
3
4
5
6
Id(A)
9/17
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