IFX 1117
Output
The IFX 1117 requires a 10 µF output capacitor with ESR ≤ 20 Ω for the stability of the
regulation loop. The use of a tantalum output capacitor is recommended.
For the adjustable device IFX 1117 GSV the output voltage level can be defined by a
voltage divider between Q, ADJ and GND.
The output voltage calculates:
VQ
=
VREF
×
1
+
RR-----21
+ IADJ × R2
(1)
At the input of the regulator a capacitor is recommended to compensate line influences.
As a minimum a 100 nF ceramic input capacitor should be used. If the regulator is used
in an environment with long input lines an input capacitance of 10 µF is suggested.
IFX 1117 GSV
VI
I3
CI1
CI2
2Q
VQ
CQ2
1
ADJ IADJ
R1 VQ - VADJ = VREF
R2
CADJ
AES02815_1117
Figure 6 Typical Application Circuit IFX 1117 GSV
Data Sheet
9
Rev. 1.21, 2009-09-04