參數(shù)資料
型號(hào)： CAT4201TD-GT3
元件分類(lèi)： LED驅(qū)動(dòng)器
英文描述： 350mA High Efficiency Step Down LED Driver
中文描述： 350mA的高效率LED驅(qū)動(dòng)下步
文件頁(yè)數(shù)： 11/15頁(yè)
文件大小： 330K
代理商： CAT4201TD-GT3
CAT4201
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. MD-5025 Rev. B
Operation from high supply voltage above 14V
It is recommended to have a slew rate of 5μs or more
for applications with supply voltages of 14V and
above. When using a high supply voltage of 24V, a 1
or 2
resistor in series with the supply, as shown on
Figure 7, is recommended to limit the slew rate of the
supply voltage. A 4.7μF minimum ceramic capacitor is
placed between the VBAT pin and ground. The
combination of the series resistor R3 and input
capacitor C1 atcs as a low pass filter limiting the
excessive in-rush currents and overvoltage transients
which would otherwise occur during “hot-plug”
conditions, thereby protecting the CAT4201 driver.
Figure 7. 24V Application with 5 LEDs
Parallel configuration for driving LEDs beyond
350mA
Several CAT4201 devices can be connected in
parallel for driving LEDs with current in excess of
350mA. The CAT4201 driver circuits are connected to
the same LED cathode. Figure 8 shows the
application schematic for driving 1A into one LED with
three CAT4201 connected in parallel. Each CAT4201
is driving the LED with a current set by its RSET
resistor. The resulting LED current is equal to the sum
of each driver current.
CTRL
SW
GND
CAT4201
VBAT
U1
VIN
4.7μF
C1
10μF
C4
1A
R4
R1
R5
8.3k
1k
1
L1
D1
RSET
22μH
CTRL
SW
GND
CAT4201
VBAT
U2
4.7μF
C2
R2
8.3k
L2
D2
RSET
22μH
CTRL
SW
GND
CAT4201
VBAT
U3
4.7μF
C3
R3
8.3k
L3
D3
RSET
22μH
Figure 8. Three CAT4201 in Parallel for 1A LED
CTRL
SW
GND
CAT4201
VBAT
VBAT
4.7μF
C1
4.7μF
C2
R1
R1
10k
1k
R3
1
L
D1
24V
RSET
33μH
300mA
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