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PDF CAV4201 Data sheet ( Hoja de datos )
| Número de pieza | CAV4201 | |
| Descripción | 350 mA High Efficiency Step Down LED Driver | |
| Fabricantes | ON Semiconductor | |
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CAV4201
350 mA High Efficiency
Step Down LED Driver
Description
The CAV4201 is a high efficiency step−down converter optimized
to drive high current LEDs. A patented switching control algorithm
allows highly efficient and accurate LED current regulation. A single
RSET resistor sets the full scale LED string current up to 350 mA from
supplies as high as 36 V.
The switching architecture of the CAV4201 results in extremely low
internal power dissipation allowing the device to be housed in a tiny
package without the need for dedicated heat sinking. The device is
compatible with switching frequencies of up to 1 MHz, making it ideal for
applications requiring small footprint and low value external inductors.
Enable, analog dimming and LED shutdown control is provided via a
single input pin, CTRL. Additional features include overload current
protection and thermal shutdown. The device is available in the low
profile 5−lead thin SOT23 package and is ideal for space constrained
applications.
Features
• LED Drive Current up to 350 mA
• Compatible with 12 V and 24 V Standard Systems
• Handles Transients up to 40 V
• Single Pin Control and Dimming Function
• Power Efficiency up to 94%
• Drives LED Strings of up to 32 V
• Open and Short LED Protection
• Parallel Configuration for Higher Output Current
• CAV Prefix for Automotive and Other Applications requiring Site
and Change Control
• TSOT−23 5−lead Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• 12 V and 24 V Lighting Systems
• Automotive and Aircraft Lighting
• General Lighting
• High Brightness 350 mA LEDs
VBAT
9 V C1
4.7 mF
Enable /
Analog Dimming
R1
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5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
CTRL
VBAT
GND
RSET
SW
(Top View)
MARKING DIAGRAMS
TFYM
TF = Device Code
Y = Production Year (Last Digit)
M = Production Month: 1−9, A, B, C
ORDERING INFORMATION
Device
Package
CAV4201TD−GT3
TSOT−23
(Pb−Free)
* Plated Finish: NiPdAu
Shipping
3,000/
Tape & Reel
VBAT
CAV4201
CTRL
RSET SW
GND
D C2
10 mF
L
22 mH
350 mA
D: ON Semiconductor MBR0540
L: Sumida CDRH6D26−220
See Table 4 and Table 5 for external component selection.
Figure 1. Typical Application Circuit
© Semiconductor Components Industries, LLC, 2011
November, 2011 − Rev. 1
1
Publication Order Number:
CAV4201/D
1 page  
CAV4201
TYPICAL OPERATION CHARACTERISTICS
(VIN = 13 V, ILED = 300 mA, L = 22 mH, C1 = 4.7 mF, C2 = 10 mF, TAMB = 25°C unless otherwise specified)
100
95
90 2 LEDs
85
80 1 LED
75
70
100
150 200 250 300
LED CURRENT (mA)
Figure 14. Efficiency vs. LED Current
350
10
8
6
4
2
0
−2
−4
−6
−8
−10
−40
VIN = 13 V
0 40 80
TEMPERATURE (°C)
Figure 15. LED Current Regulation vs.
Temperature
120
350
VF = 3.3 V
300
300 mA
250
350
VF = 3.3 V
300 300 mA
250
200
VF = 3.1 V
150
150 mA
100
200
VF = 3.1 V
150
150 mA
100
50
0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
Figure 16. LED Current vs. Input Voltage
(1 LED)
50
0
0 4 8 12 16 20 24 28
INPUT VOLTAGE (V)
Figure 17. LED Current vs. Input Voltage
(2 LEDs)
SW
5V/div
Inductor
Current
200mA/
div
2 ms/div
Figure 18. Switching Waveforms
CTRL
5V/div
LED
Current
200mA/
div
40 ms/div
Figure 19. CTRL Power−up
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5 Page 
VIN R5
1W
C1
4.7 μF
U1
VBAT
CAV4201
R1
8.3 kΩ
RSET
CTRL
SW
GND
D1
L1
22 μH
CAV4201
C4
10 μF
1A
R4
1 kΩ
C2
4.7 μF
U2
VBAT
CAV4201
R2 RSET
8.3 kΩ CTRL SW
GND
D2
L2
22 μH
C3
4.7 μF
R3
8.3 kΩ
U3
VBAT
CAV4201
RSET
CTRL SW
GND
D3
L3
22 μH
Figure 31. Open LED Mode
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
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 mH
inductor rated to the maximum supply current can be used.
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11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAV4201.PDF ] | |
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