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| 型号： | CAT4104V-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 4CH 175MA 8SOIC |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | PWM |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 汽车，背光，通用型 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 电源电压： | 3 V ~ 5.5 V |
| 输出电压： | 25V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | CAT4104V-GT3-ND CAT4104V-GT3OSTR |
CAT4104
Block Diagram
VIN
VIN
EN/PWM
1.2 V Reference
LED1 LED2
LED3
LED4
RSET
Current Setting
4 Current Sink
Regulators
GND
Figure 19. CAT4104 Functional Block Diagram
Basic Operation
I LED ^ 100
The CAT4104 has four tightly matched current sinks to
regulate LED current in each channel. The LED current in
the four channels is mirrored from the current flowing
through the RSET pin according to the following formula:
1.2 V
R SET
Table 6 shows standard resistor values for RSET and the
corresponding LED current.
Table 6. RSET RESISTOR SETTINGS
LED Current [mA] RSET [k W ]
Tight current regulation for all channels is possible over
a wide range of input voltages and LED voltages due to
independent current sensing circuitry on each channel.
Each LED channel needs a minimum of 400 mV
headroom to sink constant regulated current up to 175 mA.
If the input supply falls below 2 V, the under ? voltage
lockout circuit disables all LED channels. Any unused LED
channels should be left open.
For applications requiring more than 175 mA current,
LED channels can be tied together to sink up to a total of
700 mA from the one device.
The LED channels can withstand voltages up to 25 V. This
20
60
100
175
6.34
2.10
1.27
0.768
makes the device ideal for driving long strings of high power
LEDs from a high voltage source.
http://onsemi.com
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