ame5144 AME, Inc., ame5144 Datasheet - Page 10

• Manufacturer Part Number: ame5144
• Description: High Efficiency, 37v Step-up Converter For 2 To 10 White Leds
• Manufacturer: AME, Inc.

Duty Cycle
termines the maximum boost ratio of output-to-input volt-
age that the converter can attain in mode of operation.
The duty cycle for a given boost application is defined as:
This applies for continuous mode operation.
Calculating Load Current
rent by the relation:
switch current can be found by:
cycle, input voltage and frequency:
which allows the maximum available load current to be
calculated:
10
AME5144
The maximum duty cycle of the switching regulator de-
The load current is related to the average inductor cur-
I
Where “ D” is the duty cycle of the application. The
I
Inductor ripple current is dependent on inductance, duty
I
Combining all terms, we can develop an expression
LOAD
SW
RIPPLE
I
LOAD
= I
= I
IND
= D x (V
IND
= ( 1-D ) x ( I
(AVG) + 1 /2 (I
D =
(AVG) x (1 - D)
AME
IN
-V
V
V
OUT
SW
OUT
) / (f x L)
+ V
+ V
SW
RIPPLE
DIODE
(max) -
DIODE
)
- V
- V
SW
IN
D ( V
2fL
IN
-V
SW
)
)
Converter for 2 to 10 White LEDs
High Efficiency, 37V Step-Up
Rev. D.01