U2102B Datasheet, PDF (11/19 Pages) TEMIC Semiconductors – Multifunction Timer

U2102B
10. Current Monitoring
The U2102B’s current monitoring circuit represents a double electronic fuse. The circuit mea-
sures the current flowing through the power switch by means of the voltage drop across the
shunt resistor R_sh. This voltage is supplied to pin 11. If this voltage exceeds a value of 500 mV
due to a high load current (e.g., short circuit), the switch-off latch is set and the switching output
pin 11 closes immediately. Pin 11 can be connected to the gate via a resistor or network,
depending on load conditions, thus allowing the switch-off behavior to be adapted to the respec-
tive requirements. The short-circuit current is reduced to a problem-free value by this procedure.
There is a second threshold at 100 mV. Without exceeding the switch-off threshold of 500 mV,
the output stage is also disabled in the voltage at pin 11 exceeds the value of 100 mV for
≥ 120 ms at one half-wave. To prevent the occurrence of high-voltage peaks in the over current
condition due to the line and leakage inductances, the output stage is not switched off immedi-
ately. It is disabled during the next half-wave.
11. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point pin 13, unless otherwise specified.
Parameters
Pin
Symbol
Value
Unit
Power supply
Current
t < 10 µs
15
I_S
i_s
20
mA
60
mA
Synchronization
Input current
t ≤10 µs
16
I_I
i_i
20
mA
60
mA
Reference voltage source
Output current
1
- I_Ref
10
mA
Push-pull output stage
Output current
14
±I_O
10
mA
t ≤2 ms
14
±i_o
60
mA
Input currents
2
-I_I
1
mA
2
I_I
8
mA
3
-I_I
0.2
mA
10
± I_I
1
mA
12
I_I
20
mA
Input voltage
4, 5, 7, 8, 9, 11
V_I
6 and 12
V_I
0 to V₁
0 to V₁₅
V
V
Storage temperature range
T_stg
-40 to +125
°C
Junction temperature
T_j
+125
°C
Ambient temperature
T_amb
-10 to +100
°C
11
4767B–INDCO–10/05