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参数资料
| 型号： | CAV4201TD-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 350MA STP-DN TSOT23-5 |
| 标准包装： | 3,000 |
| 系列： | * |
CAV4201
VIN R5
1 W
C1
4.7 μ F
U1
VBAT
D1
C4
10 μ F
R1
8.3 k Ω
CAV4201
RSET
CTRL SW
GND
L1
22 μ H
1A
R4
1 k Ω
C2
4.7 μ F
U2
VBAT
CAV4201
D2
Figure 31. Open LED Mode
R2
8.3 k Ω
RSET
CTRL
GND
SW
L2
22 μ H
Board Layout
In order to minimize EMI and switching noise, the
Schottky diode, the inductor and the output capacitor C2
should all be located close to the driver IC. The input
capacitor C1 should be located close to the VBAT pin and the
Schottky diode cathode. The CAV4201 ground pin should
C3
4.7 μ F
R3
8.3 k Ω
U3
VBAT
CAV4201
RSET
CTRL SW
GND
D3
L3
22 μ H
be connected directly to the ground plane on the PCB. A
recommended PCB layout with component location is
shown on Figure 32. The LEDs are connected by two wires
tied to both sides of the output capacitor C2. The LEDs can
be located away from the driver if needed.
Figure 30. Three CAV4201 in Parallel for 1 A LED
Open LED Behavior
If the LEDs are not connected, the CAV4201 stops
switching and draws very little current.
At power ? up with no load connected, the capacitor C2 is
charged ? up by the CAV4201. As soon as the bottom side of
the capacitor (C2 ? ) reaches 0 volt, as shown on Figure 31,
the CAV4201 stops switching and remains in the idle mode
only drawing about 0.4 mA current from the supply.
Figure 32. Recommended PCB Layout
In order to further reduce the ripple on the supply rail, an
optional Pi style filter (C ? L ? C) can be used. A 10 m H
inductor rated to the maximum supply current can be used.
http://onsemi.com
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