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TD230N Datasheet(PDF) 7 Page - STMicroelectronics

Part # TD230N
Description  ELECTRONIC CIRCUIT BREAKER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TD230N Datasheet(HTML) 7 Page - STMicroelectronics

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where CISS is the input capacitance of the power
MOSFET1/2 and VTH, the threshold voltage of the
MOSFET (typically 5V).
This reconduction time can be extended with an
external soft start capacitor CSS1/2 as shown in
figure 1 CISS will therefore simply be replaced by
CISS +CSS 1/2.
1
2
3
4
5
6
7
9
10
11
12
13
14
8
15
16
P Vcc
LBOOS T
CB OOS T
PM1
GND
PM2
OS C GND
NVcc
REF1
GC1
S E NSP
INHIBIT
S HUTDOWN
S ENSN
GC 2
REF2
Vcc+
GND
Vcc-
LBOO S T
CTRIP 1
CTRIP 2
RS 2
NMos
to BOARD
CS S 1
C ONTRO L
NMOS
from BO ARD
CS S 2
RS 1
CBO OS T
Figure 1 :
Dual Electronic Circuit Breaker
Application
If the fault (over current condition) still remains
after the reconduction state of the MOSFET1/2 has
been reached, the current through NMOS1/2 will
overpass the limitation given by equation (i), and
the NMOS 1/2 will immediately be switched off
again.
Figure 2 shows the current limitation which is
operated on every restart attempt.
Figure 2 :
TD230 as Current Limitor
Trace A represents the Gate-Source Voltage of the
Power Mosfet (0 to 13,4V).
Trace B represents the voltage across the Sense
Resistor (68m
Ω) in direct relation with the current
through it (0 to ~1A).
Note that the first current peak which is due to an
over current is limited only by the reaction time of
the TD230.
This off time is tied to the value of the external soft
start capacitor CSS 1/2 by equation (iii) :
• tOFF =RDSON xCSS (iii)
While in current limitation mode, the NMOS1/2 dis-
sipates low power due to the fact that the ON/OFF
cycle time rate is very low.
Note that the higher the value of CSS1/2 are, the
more the NMOS1/2 will stay in linear mode during
current limitation.
Note that at Power ON, or in the case of live
insertion, the inrush current is automatically limited
thanks to the slow gate charge of the MOSFET
which switches ON softly due to the time constant
given in equation (ii).
2.2. Fault Time Limitation
The repetitive switching off of the MOSFET will
come to an end under two conditions :
• either the fault has disappeared,and the cur-
rent through the shunt resistors RS 1/2 has
come back to its nominal value : the system
keeps running normally.
External line defaults (lightning, line breakage,
etc...) are usual causes for such temporary over
currents.
• either the repetitive switching off has lasted
over an externally adjustable time and the
TD230 has definitively switched off the corre-
sponding NMOS : the system waits to be re-
set.
Equipment faults (component short circuit, over
heat, etc ...) are usual causes for lasting over
currents.
This fault time supervision is done by the compari-
son of the output voltage to 75% of the nominal
supply voltage. As soon as the output voltage is
detected under 0.75xVcc(+/-), the corresponding
external capacitors CTRIP1/2 is charged by a fixed
current source IP/N2 -IP/N3 (3
µA). When the voltage
across CTRIP1/2 reaches 1.20V, the corresponding
NMOS is definitively switched off and the SHUT-
DOWN pin is active low.
TD230
7/15


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