FP0030 Datasheet, PDF (4/5 Pages) Supertex, Inc – Low Voltage Protection Switch

FP0030
Functional Description
The Supertex FP0030 can be considered as a normally
closed switch controlled by a switch control (please refer to
the block diagram). The switch control monitors the voltage
drop across terminals A and B. If the voltage difference is
greater than ±1.5V, the switch will start to open. Once in the
open state, only a small amount of current, typical 800µA,
flows through the switch to detect if the high voltage is still
present or not. The switch will not close until the voltage
across terminal A and B drops below ±1.5V.
Test Circuits for T_ON and T_OFF
500ns pulse width
+10V
0V
T_X
FP0030
A
B
10Ω
10V
A
0V
B
Figure 1: T_OFF Test Circuit
2.0V
T_OFF
10%
1.0V
+10V ^{2.0ms pulse width}
100Ω
0V
10V
A
0V
1.0V
2.0V
T_X
FP0030
A
B
B
0V
Figure 2: T_ON Test Circuit
10%
T_ON
Pin Description
Pin Name
A
SUB
B
Description
Switch terminal A
Internally connect to the back of the die. Leave floating. DO NOT GROUND!
Switch terminal B
Doc.# DSFP-FP0030
A072312
Supertex inc.
4
www.supertex.com