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| 型号： | CAT4237TD-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT BCKLGHT TSOT23-5 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.3MHz |
| 电源电压： | 2.8 V ~ 5.5 V |
| 输出电压： | 30V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 805 (CN2011-ZH PDF) |
| 其它名称： | CAT4237TD-GT3DKR |
CAT4237
Table 3. DC ELECTRICAL CHARACTERISTICS
(V IN = 3.6 V, ambient temperature of 25 ° C (over recommended operating conditions unless otherwise specified))
Symbol
I Q
I SD
V FB
Parameter
Operating Current
Shutdown Current
FB Pin Voltage
Conditions
V FB = 0.2 V
V FB = 0.4 V (not switching)
V SHDN = 0 V
8 LEDs with I LED = 20 mA
Min
285
Typ
0.6
0.1
0.1
300
Max
1.5
0.6
1
315
Unit
mA
m A
mV
I FB
FB pin input leakage
1
m A
I LED
V IH
V IL
Programmed LED Current
SHDN Logic High
SHDN Logic Low
R1 = 10 W
R1 = 15 W
R1 = 20 W
Enable Threshold Level
Shutdown Threshold Level
28.5
19
14.25
0.4
30
20
15
0.8
0.7
31.5
21
15.75
1.5
mA
V
F SW
I LIM
R SW
I LEAK
Switching Frequency
Switch Current Limit
Switch “On” Resistance
Switch Leakage Current
I SW = 100 mA
Switch Off, V SW = 5 V
0.8
350
1.0
450
1.0
1
1.3
600
2.0
5
MHz
mA
W
m A
Thermal Shutdown
Thermal Hysteresis
150
20
° C
° C
V UVLO
V OV-SW
Undervoltage Lockout (UVLO) Threshold
Overvoltage Threshold
1.9
35
V
V
Pin Description
VIN is the supply input for the internal logic. The device is
compatible with supply voltages down to 2.8 V and up to
5.5 V. It is recommended that a small bypass ceramic
capacitor (4.7 m F) be placed between the VIN and GND pins
near the device. If the supply voltage drops below 1.9 V, the
device stops switching.
SHDN is the shutdown logic input. When the pin is tied to
a voltage lower than 0.4 V, the device is in shutdown mode,
drawing nearly zero current. When the pin is connected to a
voltage higher than 1.5 V, the device is enabled.
GND is the ground reference pin. This pin should be
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 35 V,
the device enters a low power operating mode preventing the
SW voltage from exceeding the maximum rating.
FB feedback pin is regulated at 0.3 V. A resistor connected
between the FB pin and ground sets the LED current
according to the formula:
connected directly to the ground place on the PCB.
I LED +
0.3 V
R 1
The lower LED cathode is connected to the FB pin.
Table 4. PIN DESCRIPTIONS
Pin #
1
2
3
4
5
Name
SW
GND
FB
SHDN
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.
http://onsemi.com
3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4237TD-GT3 | 制造商:ON Semiconductor 功能描述:IC, WHITE LED DRIVER, BOOST, TSOT-23-5 |
| CAT4237TD-T3 | 功能描述:LED照明驱动器 High Voltage Boost White LED 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 |
| CAT4237TS | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:High Voltage CMOS Boost White LED Driver |
| CAT4237TS-TE7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT4238 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Efficiency 10 LED Boost Converter |
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