2.1
Enable pin
The enable input (EN) enables/disables the
. A high-voltage signal switches the regulator on. When the
enable pin is set to low, the output is switched off. Then, the current consumption of the device is about 1 μA.
Figure 5.
Enable and disable signals
The EN input pin or the EN1 jumper enable/disable the
•
when the EN pin is set to high, it is forced to low and the output is switched off;
•
when the EN pin is set to low, it is forced to high and the output is switched on;
•
when the EN1 jumper is applied, the EN pin is forced to low and the output is switched off.
To change the output voltage while the regulator is on, apply a pulse signal to the EN input pin after the SELx pin
setting.
Figure 6.
Pulse signal in case of output voltage changing
UM3028
Enable pin
UM3028
-
Rev 1
page 5/37
