TD230
ELECTRONIC CIRCUIT BREAKER
October 1998
.
TWO N-CHANNEL MOSFETs CONTROL AND
DUAL INDEPENDANT CURRENT SUPERVI-
SION FOR OVER CURRENT PROTECTION
.
DUAL SUPPLY OPERATION
.
FROM +3/-5 TO +18/-18V OPERATING VOLT-
AGE
.
STEP-UP CONVERTER : V
CC
+13.5V OUTPUT
VOLTAGE
.
A DJ U ST A BL E
P R OT EC TI O N
M OD E
(CTRIP1/2)
.
INHIBIT FUNCTION
.
SHUTDOWN OUTPUT STATUS
.
FEW EXTERNAL COMPONENTS
DESCRIPTION
The TD230 is designed to control two N-channel
MOSFETs used as power switches in circuit break-
ing applications.
Its current supervision and immediate action on the
switches ensure high security for the boards and
the supplies thus protected against short-circuit or
over current.
In case of short-circuit or over current detection, the
TD230 immediately switches off the corresponding
MOSFET, thus disconnecting the board from the
supply. After several automatic restart attempts, a
definitive shutdown of the circuit is done if the
shortcircuit or over current persists over an exter-
nally adjustable time, until the TD230 is reset by
temporary INHIBIT signal or temporary switching
off of the power supply (hot disconnection/recon-
nection).
If the board is disconnected from the positive sup-
ply by the TD230 it will automatically be disjoncted
from the negative supply too.
TD230 integrates an induction step-up converter
that provides 13.5V above the positive rail to drive
the high side MOSFET.
1
2
3
4
5
6
7
9
10
11
12
13
14
8
15
16
P Vcc
LBOOS T
CBO OST
PM1
GND
PM2
OS CGND
NVcc
REF1
GC1
S ENSP
INHIBIT
SHUTDOWN
SENS N
GC2
REF2
PIN CONNECTIONS
ORDER CODES
Part Number
Temperature
Range
Package
N
D
TD230I
-40
o
C, +125
o
C
N
DIP16
(Plastic Package)
D
SO16
(Plastic Micropackage)
o sc
STEP -UP
PVcc
VSP 1
OS C GND
IP 2
VSP 2
IP3
IN3
IN2
VSN2
P Vcc
PVcc
LBOOST
CBOOS T
R EF1
IP1
S W1
S E NSP
S ENSN
S W2
P Vcc
IN1
GC2
R EF2
VSN1
NVcc
VSP 3
VSN3
INHIBIT
P M1
S HUTDOWN
G ND
P M2
GC1
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
CC
+
Positive Supply Voltage
+22
V
V
CC
-
Negative Supply Voltage
-22
V
Inhibit
Input Voltage
7
V
Shutdown
Input Voltage
7
V
PM1/PM2
Input Voltage
7
V
T
j
Operating Junction Temperature
-40 to 150
o
C
T
amb
Operating Ambient Temperature
-40 to 125
o
C
T
stg
Storage Temperature Range
-65 to 150
o
C
OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
+/-18
V
INSTRUCTIONS FOR USE
Symbol
Parameter
Value
Unit
C
bypass
Bypass Capacitor (each supply)
1
F
TD230
2/15
ELECTRICAL CHARACTERISTICS
V
CC
= +/-5V, T
amb
= 25
o
C, L
boost
= 220
H, C
boost
= 100nF (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
SUPPLY
V
CC
+
Positive Supply Voltage
2.7
18
V
V
CC
-
Negative Supply Voltage
-18
-4.5
V
I
CC
+
Positive Supply Current
Charge Pump Inactivated
1.8
3
mA
Charge Pump Activated
L
boost
= 220
H, C
boost
= 100nF
2.3
4
mA
I
CC
-
Negative Supply Current
Charge Pump Activated/Inactivated
-0.7
-1.5
mA
LOGIC INPUT (INHIBIT)
V
IH
High Input Voltage
2
6
V
V
IL
Low Input Voltage
0
0.8
V
tp
Propagation Delay GC1/2 (without load)
0.5
2
s
LOGIC OUTPUT (SHUTDOWN-open drain)
V
OL
Low Output Voltage (2mA)
0.8
V
I
OH
High Output Current (6V)
1
nA
t
s
Shutdown Response Time
(sens P/N shutdown without load)
8
15
s
STEP-UP CONVERTER
V
boost
Step-Up Output Voltage
V
CC
+
+10
V
CC
+
+13.4
V
CC
+
+15
V
t
vboost
Rise Time for V
boost
(10 to 90%)
250
800
s
V
rip
Output Ripple Voltge
0.15
0.6
V
INPUT COMPARATORS
V
i
Threshold (PV
CC
- Ref1, NV
CC
- Ref2)
56
63
71
mV
t
re
Response Time (GC1/2 - without load)
2
3
s
t
i
Inhibition Time (without load)
300
ns
VOLTAGE SOURCES
VSP2
VSN2
Threshold Sense Pos/Neg
0.7 V
CC+/-
0.75 V
CC+/-
0.8 V
CC+/-
V
VSP3
VSN3
Threshold Protection Mode
1.10
1.20
1.30
V
CURRENT SOURCES
IP1, IN1
Soft Start Current Sources
10
15
20
A
IP2, IN2
Protection Mode Current Sources (loading Ctrip 1/2)
3
4
5
A
IP3, IN3
Protection Mode Current Sources (discharging C
trip 1/2
)
0.6
1
1.4
A
SWITCHES
R
on
On-Resistance of the switches
SW1/SW2
90
200
TD230
3/15
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