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參數(shù)資料
| 型號： | TD230N |
| 廠商： | 意法半導體 |
| 英文描述： | ELECTRONIC CIRCUIT BREAKER |
| 中文描述： | 電子斷路器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 136K |
| 代理商： | TD230N |
Figure 6 :
Step Up Converter Rise Time
Proper operation of this step-up converter is guar-
anteed at as low as 2.7Vwith a rise time (0 to 90%
of V(C
BOOST
)) in the rangeof 700
μ
s at 2.7V which
1
2
3
4
5
6
7
8
Vcc+
GND
LBOOST
CTRIP1
CBOOST
9
10
11
12
13
14
15
16
CONTROL
PVcc
LBOOST
CBOOST
PM1
GND
PM2
OSCGND
NVcc
REF1
GC1
S ENSP
INHIBIT
SHUTDOWN
SENSN
GC2
REF2
RS1
NMos
to BOARD
CSS1
Figure 7 :
SingleElectronic Circuit Breaker
Application
is the worst case. At 5V, the rise time of V(C
boost
)
is 250
μ
s typ. The C
BOOST
voltage wave form at
power ON under 5V supply voltage is shown on
figure 6
.
Trace1
representsthepower supplyvoltage (0 to
5V).
Trace 2
represents the C
BOOST
Voltage at power
ON (0 to 5+13,4= 18,4V).
Table (a)
summerizesthe recommendedvalues of
the C
BOOST
and L
BOOST
to ensure optimized gate
charge and low ripple voltage with their corre-
sponding maximum current surge (I
PK
) and nomi-
nal consumption (I
CC
) of the
TD230
for the most
common power supply values. For each power
supply value is also given the recommended value
of a bypass capacitor (C
BY
) on the power sup-
plies.
Note thatbothC
BOOST
andL
BOOST
are availablein
surface mountpackages.
Table (a) :
Recommended values forC
boost
and
L
boost
V
CC+
C
boost
L
boost
I
pk
V
nF
μ
H
mA
2.7
47
100
5
100
220
35
10
100
220
12
220
470
39
14
220
680
34
18
220
1000
31
V
rip
mV
190
100
120
220
100
150
150
200
I
cc
mA
5
C
by
μ
F
>1
68
60
2.5
2.2
1
1
470
33
2.2
2.4
2.7
1
1
1
2.4. Single SupplyBreakerApplication
The
TD230
is perfectly suited to fit in single sup-
pliedapplications(ex0-5V), andcandriveonlyone
power MOSFET used as high side power switch.
Figure 7
shows how
TD230
can be used as a
single circuit breaker with thesame performances.
In this case, the externalcomponentsconsist in :
one boost inductor, one sense resistor, three ca-
pacitors,and one power MOSFET.
2.5. Typical Telecom Line CardsProtection
Application
One of the typical applications where the
TD230
can display all its technical advantages is in an
exchange Telecom Cards protection. Sometimes
fifty cardsor moreare to besupplied with thesame
power supply (+/-5V, 1kW), and a decentralized
protection is needed because one card may be
faulty, but should not penalizethe others with un-
adapted protection system. The risk of complete
breakdown of the system must be eradicated.
In this application the two above described over
current causes (external line perturbationor inter-
nalcomponentfault)arelikelytohappen.Inthefirst
case,the currentlimitation oneachcardwill ensure
undammagingon-boardconditions,andin thesec-
ondcase,the faultycardwill bedisjonctedfromthe
power supply untilreset.
Figure 8
shows a typicaltelecom application with
decentralizedprotection.
In thisapplication,thepositivepowersupplyserves
the logic control and analog signals whereas the
negativepower supply is dedicatedto the analog.
TD230
9/15
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