Rainbow Electronics BA3170 - Manual (Page 7)

401
Regulator ICs BA3170
(4) Over-voltage protection circuit
When the voltage between V
CC
(pin 6) and GND (pin 12)
exceeds about 27V (at normal temperature), the over-
voltage protection circuit switches all outputs off.
Make sure to use the IC within this voltage limit.
(5)
Capacitors to prevent oscillation of the outputs
Be certain to connect capacitors between OUT (pin 5)
and ground, and CP (pin 2) and ground to prevent oscilla-
tion. We recommend tantalum capacitors that have low
capacitance variation with temperature (particularly for
the OUT pin).
(6)
Thermal shutdown circuit
A thermal shutdown circuit is provided on the IC to pre-
vent it from being destroyed by high temperatures. When
this circuit operates, all outputs go off, and when the tem-
perature drops to a certain level, operation resumes.
(7)
Output circuit construction
The outputs use PNP power transistors. When the V
CC
(pin 6) voltage drops, even if the external capacitor on the
output side causes the output-side voltage to exceed the
V
CC
-side voltage, the IC will not be destroyed.
(8) Grounding
With regard to the ground connections shown in the ap-
plication example circuit, make the PCB connections
from each earth to the GND pin (pin 12) reasonably short,
and design your pattern layout to avoid electrical interfer-
ence between the pattern lines.
(9)
ASO
This IC includes a variety of protection circuits, but de-
pending on the operation conditions, it may be possible
to exceed the ASO.
Exceeding the ASO will result in destruction of the IC, so
take due care to ensure that the ASO conditions are nev-
er exceeded.
(10) Great care has been paid to the quality of this com-
ponent. However, due to the nature of lithium-ion batter-
ies, if there is a risk of danger due to failure of this compo-
nent (e.g. fire or explosion), be certain to take appropriate
measures in your design (fuses etc.).
F
Electrical characteristics curves