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CAT32 датащи(PDF) 10 Page - Catalyst Semiconductor

номер детали CAT32
подробное описание детали  CMOS White LED Driver
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производитель  CATALYST [Catalyst Semiconductor]
домашняя страница  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT32 датащи(HTML) 10 Page - Catalyst Semiconductor

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CAT32
10
Doc. No. 5001, Rev. AC
PCB LAYOUT GUIDELINES
The CAT32 is a high-frequency switching regulator and
therefore proper PCB board layout and component
placement can minimize noise and radiation and increase
efficiency. To maximize efficiency, the CAT32 design
has fast switch rise and fall times. To prevent radiation
and high frequency resonance problems minimize the
length and area of all traces connected to the SW pin and
use a ground plane under the switching regulator.
The switch, schottky output diode and output capacitor
signal path should be kept as short as possible. The
ground connection for the R
SET resistor should be tied
directly to the GND pin and not be shared with other
components.
TYPICAL APPLICATION CIRCUITS
The application diagrams below are shown for the SOT23 packages.
Two LEDs with DC Level Dimming Control:
Three LEDs with DC Level Dimming Control:
15mA
4
2
3
1
6
5
SW
VIN
SHDN
RSET
D1
VIN
2.5V DC
DIMMING
CONTROL
CAT32
LED
GND
15mA
4
2
3
1
6
5
SW
VIN
SHDN
RSET
D1
VIN
2.5V DC
DIMMING
CONTROL
CAT32
LED
GND
Efficiency - Three LEDs
LED CURRENT [mA]
60
65
70
75
80
85
0
5
10
15
20
Vin = 4.2V
Vin = 3.0V


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