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BA3918 датащи(PDF) 8 Page - Rohm

номер детали BA3918
подробное описание детали  System power supply for car stereos
Download  9 Pages
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BA3918 датащи(HTML) 8 Page - Rohm

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249
Regulator ICs
BA3918
FOperation notes
(1)
Example of application
The application circuit of Fig. 3 is recommended for use.
Make sure to confirm the adequacy of parts characteris-
tics. When using the circuit with changes to external cir-
cuit constants, make sure to leave sufficient margins in
consideration of fluctuations in the IC and external com-
ponents including static and transitional characteristics.
Note that ROHM has not carried out extensive survey re-
garding the patent right of this application.
(2)
Operating power supply voltage
When operating within the proper ranges of power supply
voltage and ambient temperature, most circuit functions
are guaranteed. Although the rated values of electrical
characteristics cannot be absolutely guaranteed, char-
acteristic values do not change drastically within the
proper ranges.
(3)
Power dissipation (Pd)
Refer to the power dissipation curves (Fig. 4) and the
rough estimation of IC power dissipation given on a sepa-
rate page. Make sure your design allows a maximum
power within the operating temperature range.
(4)
Overvoltage protection circuit
The overvoltage protection circuit turns OFF all outputs
when the potential difference between VCC (pin 7) and
GND (pin 12) is more than about 26V at normal tempera-
ture. Make sure to use the IC within this voltage limit.
(5)
Preventing oscillation at each output
To stop output oscillation, make sure to connect a capaci-
tor having a capacitance of 10
µF or greater between
GND and each of the VDD (pin 5), COM (pin 9), AM (pin
10), and FM (pin 11) output pins. We recommend using
a tantalum electrolytic capacitor whose capacitance is
unsusceptible to temperature.
(6)
Overcurrent protection circuit
An overcurrent protection circuit is installed on the VDD
(pin 5), AMP (pin 6), ANT (pin 8), COM (pin 9), AM (pin
10), and FM (pin 11) outputs, based on the respective
output current. This prevents IC destruction due to over-
current, by limiting the current with a curve shape of “7”
in the voltage-current graph. The IC is designed with
margins so that current flow will be restricted and latching
will be prevented even if a large current suddenly flows
through a large capacitor. The circuit should be carefully
set because output current is further restricted when out-
put voltage is less than 1VF (considered as short mode).
(7)
Thermal protection circuit
A built-in thermal protection circuit prevents thermal
damage to the IC. All outputs except VDD are switched
OFF when the circuit operates, and revert to the original
state when temperature drops to a certain level.
(8)
Grounding
Each ground trace in the application circuit of Fig. 3 must
be adequately short from GND (pin 12). Make sure to ar-
range the ground traces in a pattern that prevents mutual
interference.
(9)
Although the quality of this IC is rigorously con-
trolled, the IC may be destroyed when the supply voltage
or the operating temperature exceeds their absolute
maximum ratings. Because short mode or open mode
cannot be specified when the IC is destroyed, be sure to
take physical safety measures, such as fusing, if any of
the absolute maximum ratings might be exceeded.
(10) We recommend installing a bypass line in your ap-
plication if there is a mode where potential difference be-
tween each output and input (VCC) or GND is reversed
from the normal state.
FThermal derating characteristic curve


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