NJM2847F3-012 Просмотр технического описания (PDF) - Japan Radio Corporation
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NJM2847F3-012 Datasheet PDF : 4 Pages
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NJM2847
b) In use of ON/OFF control:
VIN
0.1µF
VIN
VOUT
NJM2847
R
CONTROL
NOISE
BYPASS
GND
2.2µF
VOUT
Cp=0.01µF
State of control terminal:
•“H”→ output is enabled.
•“L” or “open” → output is disabled.
* Noise bypass Capacitance Cp
Noise bypass capacitance Cp reduces noise generated by band-gap reference circuit.
Noise level and ripple rejection will be improved when larger Cp is used.
Use of smaller Cp value may cause oscillation.
Use the Cp value of 0.01µF greater to avoid the problem.
* Input Capacitance CIN
Input Capacitance CIN is required to prevent oscillation and reduce power supply ripple for applications with high
power supply impedance or a long power supply line.
Use the CIN value of 0.1µF greater to avoid the problem.
CIN should connect between GND and VIN as short as possible.
* In the case of using a resistance "R" between VIN and control.
The current flow into the control terminal while the IC is ON state (ICONT) can be reduced when a pull up resistance
"R" is inserted between VIN and the control terminal.
The minimum control voltage for ON state (VCONT (ON)) is increased due to the voltage drop caused by ICONT and the
resistance "R". The ICONT is temperature dependence as shown in the "Control Current vs. Temperature"
characteristics. Therefore, the resistance "R" should be carefully selected to ensure the control voltage exceeds
the VCONT (ON) over the required temperature range.
-4-
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including the
industrial rights.
Ver.2008-11-07
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