TISP83121D 데이터 시트보기 (PDF) - Bourns, Inc
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TISP83121D Datasheet PDF : 5 Pages
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TISP83121D Unidirectional P & N-Gate Protector
Battery Supply Impedance
In many designs, the battery supply voltages are generated by switching mode power supplies. This type of power supply cannot be charged
like a battery. Feeding a charging current to a switching mode power supply will usually cause the supply to stop switching and the voltage to
rise. The gate current of the TISP83121D is a charging current for the supply. To avoid the supply voltage from rising and damaging the
connected SLICs, an avalanche diode voltage clamp can be connected across the supply (Figure 3. (A)).
Another approach is to reduce the gate charging current for the supply by a transistor buffer (Figure 3. (B)). If the transistor gain was 50, a
200 mA gate current would be reduced to a supply charging current of 200/50 = 4 mA. In both cases, the dissipation in the control devices can
be substantial and power capability needs to be taken into account in device selection.
A
G2
+VE
REFERENCE
VOLTAGE
+VBAT
G1
TISP83121D
K
0
A
TISP83121D
G2
G1
K
-VE
REFERENCE
VOLTAGE
(A)
-VBAT
A
G2
G1
TISP83121D
K
A
G2
TISP83121D
G1
K
+VE
REFERENCE
VOLTAGE
+VBAT
0
-VE
-VBAT
REFERENCE
VOLTAGE AI8XAB
(B)
Figure 3. Reference Voltage Control by (A) Breakdown Diodes or (B) by Transistor Buffers
“TISP” is a trademark of Bourns, Ltd., a Bourns Company, and is Registered in U.S. Patent and Trademark Office.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
FEBRUARY 1999 – REVISED JULY 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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