The JTM6281 regulator is fixed frequency PWM Boost (step-up)

1.产品概述         2.产品特点
3.应用范围       4.下载产品资料PDF文档
5.产品封装图                     6.电路原理图
7.功能概述       8.相关产品

一,产品概述(General Description)
     The JTM6281 regulator is fixed frequency PWM Boost (step-up) LED
constant current driver,capable of driving Series 1W LED units with
excellent line and load regulation. The regulator is simple to use because
it includes internal frequency compensation and a fixed-frequency oscillator
so that it requires a minimum number of external components to work.
The JTM6281 could directly drive 5~8 Series 1W LED units at VIN>12V .
      The PWM control circuit is able to adjust the duty ratio linearly from 0
to 90%. An enable function, an over current protection function is built inside.
An internal compensation block is built in to minimize external component count.

二.产品特点(Features)
1.)Wide 3.6V to 24V Input Voltage Rang
2.)0.22V Constant Current Sense Voltage
3.)Directly drive 3~8 Series 1W LED
4.)Fixed 400KHz Switching Frequency
5.)Max. 2A Switching Current Capability
6.)Up to 92% efficiency
7.)Excellent line and load regulation
8.)EN PIN TTL shutdown capability
9.)Internal Optimize Power MOSFET
10.)Built in LED Open Protection
11.)Built in Soft-Start Function
12.)Built in Frequency Compensation
13.)Built in Thermal Shutdown Function
14.)Built in Current Limit Function
15.)Available in SOP8 package

三,应用范围 (Applications)
LED Lighting
Boost constant current driver
Monitor LED Backlighting
7’ to 15’ LCD Panels

四.下载产品资料PDF文档

jtm6281

五,产品封装图 (Package)

Pin Number	Pin Name	Description
1	EN	Enable Pin. Drive EN pin low to turn off the device, drive it high to turn it on. Floating is default high.
2	VIN	Supply Voltage Input Pin. JTM6281 operates from a 3.6V to 24V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
3	FB	Feedback Pin (FB). The feedback threshold voltage is 0.22V.
4	NC	No Connected.
5,6	SW	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.
7,8	GND	Ground Pin.

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