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ZXSC310
Peak current definition
The peak current rating is a design parameter whose
value is dependent upon the overall application. For
the high brightness reference designs, a peak current
Once I PK is decided the value of R SENSE can be
determined by:
of 190mA was chosen to ensure that the converter
could provide the required output power to the LED.
In general, the I PK value must be chosen to ensure that
R SENSE =
V ISENSE
I PK
the switching transistor, Q1, is in full saturation with
maximum output power conditions, assuming
worse-case input voltage and transistor gain under all
operating temperature extremes.
A selection guide of sense resistor and inductor values
for given input voltages, output currents and number
of LED connected in series is provided in the table
below.
Input Voltage
(V)
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
3.3V
5V
5V
5V
5V
5V
5V
5V
5V
5V
LED current
(mA)
10
10
10
20
20
20
30
30
30
10
10
10
20
20
20
30
30
30
No. of LED ’s
3
4
6
3
4
6
3
4
6
3
4
6
3
4
6
3
4
6
R SENSE
(m )
510
330
150
220
150
77
170
100
47
750
510
330
440
250
150
330
170
100
Inductor
( H)
68
68
68
68
68
68
68
68
68
68
68
68
68
68
68
68
68
68
Efficiency
(%)
80
81
79
84
93
79
84
84
77
83
84
79
85
85
82
86
85
83
ISSUE 3 - SEPTEMBER 2007
SEMICONDUCTORS
10
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