CS1937 参数 Datasheet PDF下载

型号：	CS1937
PDF下载：	下载PDF文件查看货源
内容描述：	CS1937ES5是DC/DC升压型白光LED驱动IC,可以替代多种型号:LT1937,AIC1896,RT9271,LM2703,CP2126,MP3205,AT1308X等.广泛应用于手机、MP3等便携式电子设备。 [CS1937ES5是DC/DC升压型白光LED驱动IC,可以替代多种型号:LT1937,AIC1896,RT9271,LM2703,CP2126,MP3205,AT1308X等.广泛应用于手机、MP3等便携式电子设备。]
分类和应用：	电子驱动手机便携式
文件页数/大小：	6 页 / 209 K
品牌：	SAMES [ SAMES ]

CS1937

Application Information

1. LED Current Setting

The LED current is controlled by the feedback resistor R1. The formula is:

R1=95mV/I

LED

For example, if you intend to set

LED

=15mA, then R1 will be 6.34Ω.

2. Open-Circuit Protection

In the cases of output open circuit, when the LEDs are disconnected from the circuit or

the LEDs fail, the feedback voltage will be zero. The CS1937 will then switch at a high

duty cycle resulting in a high output voltage, which may cause the SW pin voltage to

exceed its maximum 36V rating. A zener diode can be used at the output to limit the

voltage on the SW pin . The zener voltage should be larger than the maximum forward

voltage of the LED string. The current rating of the zener should be larger than 0.1mA.

3. Dimming Control

There are 4 different types of dimming control circuits: PWM control, DC voltage

control, filtered PWM control and logic signal control.

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