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AN79L07 Datasheet(PDF) 10 Page - Panasonic Semiconductor

Part No. AN79L07
Description  3-pin negative output voltage regulator (100 mA type)
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Maker  PANASONIC [Panasonic Semiconductor]
Homepage  http://www.panasonic.com/industrial/
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AN79L07 Datasheet(HTML) 10 Page - Panasonic Semiconductor

 
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AN79Lxx/AN79LxxM Series
10
SFF00006CEB
I Usage Notes
1. Cautions for a basic circuit
CI: When a wiring from a smoothing circuit to a three-pin regulator
is long, it is likely to oscillate at output. A capacitor of 0.1
µF to
0.47
µF should be connected near an input pin.
CO: Deadly needed to prevent from oscillation (0.33µF to 1.0µF). It
is recommended to use a capacitor of a small internal imped-
ance (ex. tantalum capacitor) when using it under a low tem-
perature.
When any sudden change of load current is likely to occur, con-
nect an electrolytic capacitor of 10
µF to 100µF to improve a
transitional response of output voltage.
Di: Normally unnecessary. But add it in the case that there is a
residual voltage at the output capacitor Co even after switching
off the supply power because a current is likely to flow into an
output pin of the IC and damage the IC.
2. Other caution items
1) Short-circuit between the input pin and GND pin
If the input pin is short-circuitted to GND or is cut
off when a large capacitance capacitor has been con-
nected to the IC's load, a voltage of a capacitor con-
nected to an output pin is applied between input/out-
put of the IC and this likely results in damage of the
IC. It is necessary, therefore, to connect a diode, as
shown in figure 2, to counter the reverse bias between
input/output pins.
2) Floating of GND pin
If a GND pin is made floating in an operating mode, an unstabilized input voltage is outputted. In this case, a
thermal protection circuit inside the IC does not normally operate. In this state, if the load is short-circuited or
overloaded, it is likely to damage the IC.
I Application Circuit Example
Figure 1
CO
VO
CI
VI
Di
1
3
2
In
GND
Out
Figure 2
CO
Output
1
3
2
+
−V
O
2
µF
1
µF
IBias
AN79Lxx
3
1
2
R2
R1
VO'
−V
I
Input
Common
Output
|VO | = VO' 1 +
+ IQR1
R2
R1
+
+
Note) VO varies due to sample to sample variation of IBias .
Never fail to adjust individually with R1 .


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