LM2735YMYEVAL National Semiconductor, LM2735YMYEVAL Datasheet - Page 20
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LM2735YMYEVAL
Manufacturer Part Number
LM2735YMYEVAL
Description
BOARD EVAL LM2735 520KHZ 8MSOP
Manufacturer
National Semiconductor
Specifications of LM2735YMYEVAL
Main Purpose
DC/DC, Step Up
Outputs And Type
1, Non-Isolated
Voltage - Output
12V
Current - Output
500mA
Voltage - Input
3 ~ 5.5V
Regulator Topology
Boost
Frequency - Switching
520kHz
Board Type
Fully Populated
Utilized Ic / Part
LM2735
Lead Free Status / RoHS Status
Lead free / RoHS 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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