EUP7965
Adjustable Operation
The adjustable version of the EUP7965 has an output
voltage range of 1.25V to 5V. The output voltage of the
EUP7965 adjustable regulator is programmed using an
external resistor divider as shown in Figure3. The output
voltage is calculated using:
R
R
1
2
V
O
= V × (1+
ref
)
Where:
Vref=1.23V typ. (the internal reference voltage)
Utilize the following equation for adjusting the output to
a particular voltage:
V
O
P = R
−1
I
2
1.23V
Choose R2=100k to optimize accuracy, power supply
rejection, noise and power consumption.
In order to improve the stability of the adjustable version,
it is suggested that a small compensation capacitor C1 be
placed between VOUT and SET .
DS7965 Ver1.5 March. 2006
13
EUTECH [ EUTECH MICROELECTRONICS INC ]
