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PDF CAT4201 Data sheet ( Hoja de datos )
| Número de pieza | CAT4201 | |
| Descripción | 350 mA High Efficiency Step Down LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT4201
350 mA High Efficiency
Step Down LED Driver
Description
The CAT4201 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 CAT4201 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.
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 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
• 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
R1
10 kW
CAT4201
VBAT
RSET
CTRL
SW
GND
D C2
10 mF
L
22 mH
D: ON Semiconductor MBR0540
L: Sumida CDRH6D26−220
See Table 4 on page 6 for external component selection.
Figure 1. Typical Application Circuit
300 mA
www.onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS AND
MARKING DIAGRAMS (Top Views)
1
CTRL
VBAT
GND
RSET
SW
TSOT−23
TF = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month: (1−9, O, N, D)
ORDERING INFORMATION
Device
CAT4201TD−GT3
Package
TSOT−23
(Pb−Free)
Shipping
3,000/
Tape & Reel
* Plated Finish: NiPdAu
© Semiconductor Components Industries, LLC, 2015
September, 2015 − Rev. 9
1
Publication Order Number:
CAT4201/D
1 page  
CAT4201
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
2 LEDs
90
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
5 Page 
CAT4201
VIN R5
1 W C1
4.7 μF
U1
VBAT
CAT4201
R1 8.3 kΩ RSET
CTRL SW
GND
D1
L1
22 μH
C4
10 μF
1A
R4
1 kΩ
C2
4.7 μF
U2
VBAT
CAT4201
R2 RSET
8.3 kΩ
CTRL SW
GND
D2
L2
22 μH
C3
4.7 μF
R3
8.3 kΩ
U3
VBAT
CAT4201
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 CAT4201 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 CAT4201 in Parallel for 1 A LED
Open LED Behavior
If the LEDs are not connected, the CAT4201 stops
switching and draws very little current.
At power−up with no load connected, the capacitor C2 is
charged−up by the CAT4201. As soon as the bottom side of
the capacitor (C2−) reaches 0 volt, as shown on Figure 31,
the CAT4201 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.
www.onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAT4201.PDF ] | |
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