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ZXSC310 bảng dữ liệu(PDF) 10 Page - Diodes Incorporated

tên linh kiện ZXSC310
Giải thích chi tiết về linh kiện  LED DRIVER SOLUTION FOR LCD BACKLIGHTING
PDF  16 Pages
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nhà sản xuất  DIODES [Diodes Incorporated]
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ZXSC310 bảng dữ liệu(HTML) 10 Page - Diodes Incorporated

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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
of 190mA was chosen to ensure that the converter
could provide the required output power to the LED.
In general, the IPK value must be chosen to ensure that
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.
Once IPK is decided the value of RSENSE can be
determined by:
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.
SEMICO NDUC TORS
ZXSC310
ISSUE 3 - SEPTEMBER 2007
10
R
V
I
SENSE
ISENSE
PK
=
Input Voltage
(V)
LED current
(mA)
No. of LED’s
R
SENSE
(m )
Inductor
( H)
Efficiency
(%)
3.3V
10
3
510
68
80
3.3V
10
4
330
68
81
3.3V
10
6
150
68
79
3.3V
20
3
220
68
84
3.3V
20
4
150
68
93
3.3V
20
6
77
68
79
3.3V
30
3
170
68
84
3.3V
30
4
100
68
84
3.3V
30
6
47
68
77
5V
10
3
750
68
83
5V
10
4
510
68
84
5V
10
6
330
68
79
5V
20
3
440
68
85
5V
20
4
250
68
85
5V
20
6
150
68
82
5V
30
3
330
68
86
5V
30
4
170
68
85
5V
30
6
100
68
83



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