Linear Technology Analog Devices LT8301 Datasheet page 18

LT8301
APPLICATIONS INFORMATION
Step 7: Select the EN/UVLO Resistors.
Determine the amount of hysteresis required and calcu-
late R1 resistor value:
V = 2.5µA • R1
IN(HYS)
Example:
Choose 2V of hysteresis,
R1 = 806k
Determine the UVLO thresholds and calculate R2 resistor
value:
1.242V • (R1+ R2)
V
=
IN(UVLO+)
R2
Example:
Set V UVLO rising threshold to 7.5V,
IN
R2 = 232k
V = 7.5V
IN(UVLO+)
V = 5.5V
IN(UVLO–)
18
+ 2.5µA • R1
For more information
Step 8: Ensure minimum load.
The theoretical minimum load can be approximately esti-
mated as:
40µH • (360mA)
I
=
LOAD(MIN)
Remember to check the minimum load requirement in
real application. The minimum load occurs at the point
where the output voltage begins to climb up as the con-
verter delivers more energy than what is consumed at
the output. The real minimum load for this application is
about 6mA. In this example, a 820Ω resistor is selected
as the minimum load.
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2
• 10.6kHz
= 5.5mA
2 • 5V
Rev. A