TD230IDT STMicroelectronics, TD230IDT Datasheet - Page 4

• Manufacturer Part Number: TD230IDT
• Description: MOSFET & Power Driver ICs
• Manufacturer: STMicroelectronics

Specifications of TD230IDT

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Proper operation of this step-up converter is guar-
anteed at as low as 2.7V with a rise time (0 to 90%
of V(C
is the worst case. At 5V, the rise time of V(C
is 250 s typ. The C
power ON under 5V supply voltage is shown on
figure 6.
Figure 6 : Step Up Converter Rise Time
Trace 1 represents the power supply voltage (0 to
5V).
Trace 2 represents the C
ON (0 to 5+13,4 = 18,4V).
Table (a) summerizes the recommended values
of the C
charge and low ripple voltage with their corre-
sponding maximum current surge (I
nal consumption (I
common power supply values. For each power
supply value is also given the recommended value
of a bypass capacitor (C
plies.
Note that both C
surface mount packages.
Table (a) : Recommended values for C
4/8
V
2.7
10
12
14
18
CC
V
5
+
BOOST
BOOST
C
L
)) in the range of 700 s at 2.7V which
BOOST
100
100
100
220
220
220
220
nF
47
BOOST
and L
BOOST
L
1000
BOOST
220
470
470
680
CC
BOOST
68
H
) of the TD230 for the most
BOOST
and L
to ensure optimized gate
BY
mA
60
35
33
39
34
31
I
BOOST
) on the power sup-
pk
voltage wave form at
BOOST
Voltage at power
190
100
120
220
100
150
150
200
mV
V
rip
are available in
PK
) and nomi-
mA
I
2.5
2.2
2.2
2.4
2.7
BOOST
CC
5
BOOST
and
C
>1
1
1
1
1
1
by
F
)
2.4. Single Supply Breaker Application
The TD230 is perfectly suited to fit in single sup-
plied applications (ex 0-5V), and can drive only
one power MOSFET used as high side power
switch.
Figure 7 shows how TD230 can be used as a sin-
gle circuit breaker with the same performances.
Figure 7 : Single Electronic Circuit Breaker
In this case, the external components consist in
one boost inductor, one sense resistor, three ca-
pacitors, and one power MOSFET.
2.5. Typical Telecom Line Cards Protection
Application
One of the typical applications where the TD230
can display all its technical advantages is in an ex-
change Telecom Cards protection. Sometimes fif-
ty cards or more are to be supplied with the same
power supply (+/-5V, 1kW), and a decentralized
protection is needed because one card may be
faulty, but should not penalize the 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 perturbation or inter-
nal component fault) are likely to happen. In the
first case, the current limitation on each card will
ensure undammaging on-board conditions, and in
the second case, the faulty card will be disjoncted
from the power supply until reset.
Figure 8 shows a typical telecom application with
decentralized protection.
In this application, the positive power supply
serves the logic control and analog signals where-
as the negative power supply is dedicated to the
analog.
Application
AN1280 - APPLICATION NOTE