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参数资料
| 型号： | CAT4201AEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION DPP CAT4201A |
| 设计资源： | CAT4201AEVB Schematic CAT4201AEVB Gerber Files CAT4201AEVB Bill of Materials |
| 标准包装： | 1 |
| 系列： | * |
CAT4201
300
250
200
150
100
50
Operation from High Supply Voltage Above 14 V
For operation from a supply voltage above 14 V, it is
recommended to have a slew rate of 1 m s or more for every
5 V increase in VBAT supply. When using a high supply
voltage of 24 V, a 1 W or 2 W resistor in series with the supply,
as shown on Figure 28, is recommended to limit the slew rate
of the supply voltage. A 4.7 m F minimum ceramic capacitor
is placed between the VBAT pin and ground. The
combination of the series resistor R3 and input capacitor C1
acts as a low pass filter limiting the excessive in ? rush
currents and overvoltage transients which would otherwise
0
100
80
60
40
20
0
occur during “hot ? plug” conditions, thereby protecting the
CAT4201 driver.
DUTY CYCLE [%]
Figure 25. LED Current vs. Duty Cycle
VBAT R3
24 V 1 W C1
VBAT
4.7 m F
VBAT
D1
C2
5V
4.7 m F
L
10 k W CTRL SW
GND
33 m H
12 V C1
4.7 m F
R1
10 k W
PWM
control
0V
VBAT
CAT4201
RSET
CTRL SW
GND
R4
1 k W R5
47 k W
D
C2
10 m F
L
22 m H
R2
1 k W
Q1
NPN
CAT4201
RSET
R1
300 mA
R1
1 k W
Figure 28. 24 V Application with 5 LEDs
Operation from High Supply Voltage of 36 V
When powering from a high supply voltage of 36 V, a 2 W
resistor in series with the supply is recommended, as shown
on Figure 29, to limit the slew rate of the supply voltage.
Figure 26. Circuit for PWM on CTRL
PWM on RSET Pin
Another dimming method is to place in parallel to R1
Inductor value should be 33 m H or higher.
VBAT R3
36 V 2 W C1
SW
another resistor with a FET in series, as shown on Figure 27.
R1 sets the minimum LED current corresponding to 0% duty
cycle. The combined resistor of R1 and Rmax sets the
maximum LED current corresponding to 100% duty cycle.
VBAT
4.7 m F
R1
10 k W
VBAT
CAT4201
RSET
CTRL
GND
D1 C2
2.2 m F
L
47 m H
300 mA
13 V C1
R2
4.7 m F
Rmax R1
PWM
control
OFF ON
VBAT
CAT4201
RSET
CTRL SW
GND
D
C2
10 m F
L
22 m H
R2
1 k W
Q1
NPN
1 k W
Figure 29. 36 V Application with 6 LEDs
Parallel Configuration for Driving LEDs Beyond
350 mA
Several CAT4201 devices can be connected in parallel for
driving LEDs with current in excess of 350 mA. The
CAT4201 driver circuits are connected to the same LED
cathode. Figure 30 shows the application schematic for
Figure 27. Circuit for PWM on RSET
A resistor value for R1 of less than 90 k W is recommended
to provide better accuracy.
driving 1 A 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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4201AGEVB | 功能描述:LED 照明开发工具 EVAL BOARD FOR LED DRIVER RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| CAT4201TD | 制造商:ON Semiconductor 功能描述:IC LED DRIVER HI EFFICIENCY |
| CAT4201TD-GT3 | 功能描述:LED照明驱动器 350mA Hi-Efficiency Step-Down RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| CAT4201TD-GT3 | 制造商:ON Semiconductor 功能描述:IC LED DRIVER BUCK TSOT-23-5 制造商:ON Semiconductor 功能描述:IC, LED DRIVER, BUCK, TSOT-23-5 |
| CAT4237 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
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