QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1286
48V OUTPUT BOOST CONVERTER
2
5.
Once the proper output voltage is established, adjust
the load and observe the output voltage regulation,
ripple voltage, efficiency and other parameters.
OPTIONAL BIAS CIRCUIT
The demo board DC1286A can be used for boosting
higher input voltages as well. In that case, the bias
power for LTC3862 has to be limited under 36V. An ex-
ternal power source can be used to accomplish this or
the optional bias regulator can be used by moving JP4
to 12V position. Since the power dissipation in bias
regulator Q5 depends on the size of MOSFETs, switching
frequency and voltage difference across Q5 all of the
factors need to be considered when selecting the appro-
priate device for Q5. Please refer to LTC3862 data sheet
for bias power requirements.
Figure 1.
Proper Measurement Equipment Setup
Figure 2.
Measuring Input or Output Ripple
