LM2735SD3.3EVAL National Semiconductor, LM2735SD3.3EVAL Datasheet - Page 20

• Manufacturer Part Number: LM2735SD3.3EVAL
• Description: BOARD EVALUATION FOR LM2735
• Manufacturer: National Semiconductor

Specifications of LM2735SD3.3EVAL

• Main Purpose: DC/DC, Step Up
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3.3V
• Current - Output: 500mA
• Voltage - Input: 3 ~ 5.5V
• Regulator Topology: Boost
• Frequency - Switching: 1.6MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM2735
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

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Substituting I
The average inductor current of L2 is the average output load.
FIGURE 15. Inductor Volt-Sec Balance Waveform
L1
into I
L2
FIGURE 16. SEPIC CONVERTER Schematic
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Applying Charge balance on C1:
Since there are no DC voltages across either inductor, and
capacitor C6 is connected to Vin through L1 at one end, or to
ground through L2 on the other end, we can say that
Therefore:
This verifies the original conversion ratio equation.
It is important to remember that the internal switch current is
equal to I
so that the minimum guaranteed peak switch current limit
(2.1A) is not exceeded.
L1
and I
L2
. During the D interval. Design the converter
V
C1
= V
IN
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