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Which is the correct inductance for a boost converter?
Figure 1 is a graph of the inverse boost ratio (VIN/VOUT) versus the duty cycle terms (Dx (1-D) 2) in the inductance equation (Equation 1). This term is directly portional to the required inductance in a CCM boost. The peak of this plot occurs when the ratio of VIN/VOUT is 2/3, or when the boost ratio (VOUT/VIN) is 1.5 [1].
Which is the best mode for a boost converter?
To the boost converter designer, it may not be obvious whether or not the converter should be designed to operate in continuous conduction mode (CCM), discontinuous conduction mode (DCM), or a combination of both. Boost converters come in many shapes and sizes, with a wide range of power levels and boost ratios.
What are the equations for boost switching converter?
First, here are some definitions: Peak inductor current i pk Min inductor current i o Ripple Current Ripple Current Ratio to Average Current Off Duty Cycle
What causes instability in a boost switching converter?
This causes an instability, which is well known for boost converters, and not a problem with buck converters. One way to combat this instability is to choose a large enough inductor so that the ripple current is greater than twice the minimum load current.
When does a boost converter switch from DCM to CCM?
Boost converters come in many shapes and sizes, with a wide range of power levels and boost ratios. These requirements determine whether the boost is best designed to operate in CCM or DCM. In DCM, the inductor current ramps up from zero when the FET is on and fully discharged back to zero again before the next switching period.
When to use Vin / Vout ratio for inductance?
What this means is that in designs using a varying input voltage, there’s a band of VIN/VOUT ratios that the circuit must operate between. If the range is wide and this band includes the peak for Figure 1, then the inductance should be calculated at the VIN/VOUT ratio of 2/3.