QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 545
MICROPOWER STEP-UP SWITCHING REGULATOR IN SC-70
2
12V OUTPUT SEPIC CONVERTER (LOWER CIRCUIT)
Refer to Figure 2 for proper measurement equipment setup and follow the procedure below:
1. Connect the input power supply (set at 10V) to the
Vin
and
GND
pins of the
SEPIC
converter
.
2. Turn on the input power supply. The output volt-
ages should read 0V.
3. Turn on the load box preset at 50mA. The input
current should read around
≅
75mA and the out-
put voltage should now read 12.1V
±
0.20V.
4. Slowly change the input power supply voltage
from 10V to 16V while observing the output volt-
age. The output should stay within 12.1V
±
0.20V.
5. Observe the input current at 16V, it should read
around 50mA.
6. Change the input power supply back to 10V and
check the output ripple using the oscilloscope (re-
fer to Figure 3). The output ripple should not be
greater than 60mV. Also check the switching fre-
quency, it should be
≅
1.3MHz.
