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參數(shù)資料
| 型號(hào)： | CAT4240TD-GT3 |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | 6 Watt Boost LED Driver |
| 中文描述： | 6瓦升壓LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 6/14頁(yè) |
| 文件大?。?/td> | 319K |
| 代理商： | CAT4240TD-GT3 |
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CAT4240
Doc. No. MD-5026 Rev. B
6
Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
PIN DESCRIPTION
VIN
is the supply input for the internal logic. The
device is compatible with supply voltages down to
2.8V and up to 5.5V. It is recommended that a small
bypass ceramic capacitor (4.7
μ
F) be placed between
the VIN and GND pins near the device. If the supply
voltage drops below 1.9V, the device stops switching.
SHDN
ˉˉˉˉˉ is the shutdown logic input. When the pin is
tied to a voltage lower than 0.4V, the device is in
shutdown mode, drawing nearly zero current. When
the pin is connected to a voltage higher than 1.5V, the
device is enabled.
GND
is the ground reference pin. This pin should be
connected directly to the ground plane on the PCB.
SW
pin is connected to the drain of the internal CMOS
power switch of the boost converter. The inductor and
the Schottky diode anode should be connected to the
SW pin. Traces going to the SW pin should be as
short as possible with minimum loop area. An over-
voltage detection circuit is connected to the SW pin.
When the voltage reaches 40V, the device enters a
low power operating mode preventing the SW voltage
from exceeding the maximum rating.
FB
feedback pin is regulated at 0.3V. A resistor
connected between the FB pin and ground sets the
LED current according to the formula:
I
LED
= 0.3V/R1
The lower LED cathode is connected to the FB pin.
Pin #
1
2
3
4
5
Name
SW
GND
FB
ˉˉˉˉˉ
VIN
Function
Switch pin. This is the drain of the internal power switch.
Ground pin. Connect the pin to the ground plane.
Feedback pin. Connect to the last LED cathode.
Shutdown pin (Logic Low). Set high to enable the driver.
Power Supply input.
BLOCK DIAGRAM
V
IN
V
IN
Enable
Current
Sense
300mV
R1
LED
Current
C1
R
C
N1
R
S
C
C
SHDN
Thermal
Shutdown
& UVLO
V
REF
1MHz
Oscillator
Over Voltage
Protection
PWM &
Logic
Driver
C2
GND
SW
FB
+
–
+
–
+
–
A1
A2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CAT4240TD-GT3 | 制造商:ON Semiconductor 功能描述:IC LED DRIVER BOOST TSOT-23-5 制造商:ON Semiconductor 功能描述:IC, LED DRIVER, BOOST, TSOT-23-5 |
| CAT-42506 | 制造商:Thomas & Betts 功能描述:1/4' YELLOW 6 PCS. PER BAG |
| CAT4254VP2-GT3 | 制造商:Catalyst Semiconductor 功能描述: 制造商:ON Semiconductor 功能描述: |
| CAT431L | 制造商:CATALYST 制造商全稱:Catalyst Semiconductor 功能描述:Low-Voltage Adjustable Precision Voltage Reference |
| CAT431LEUK-TE7 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 1.24V .5% RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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