The JTM3103 is a 180 KHz fixed frequency PWM buck (step-down

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 JTM3103 is a 180 KHz fixed frequency PWM buck (step-down) DC/DC
converter,capable of driving a 4A load with high efficiency, low ripple and excellent
line and load regulation.Requiring a minimumnumber of external components, the
regulator is simple to use and include internal frequency compensation and a
fixed-frequency oscillator.
     The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%.
An over current protection function is built inside.When short protection
function happens, the operation frequency will be reduced from 180KHz
to 48KHz. An internal compensation block is built in to minimize external component count.

二.产品特点(Features)
1.)Wide 8V to 36V Input Voltage Range
2.)Output Adjustable from 1.25V to 32V
3.)Maximum Duty Cycle 100%
4.)Minimum Drop Out 0.3V
5.)Fixed 180KHz Switching Frequency
6.)4A Constant Output Current Capability
7.)Internal Optimize Power MOSFET
8.)High efficiency
9.)Excellent line and load regulation
10.)Built in thermal shutdown function
11.)Built in current limit function
12.)Built in output short protection function
13.)Available in TO-252 package

三,应用范围 (Applications)
LCD Monitor and LCD TV
Portable instrument power supply
Telecom / Networking Equipment

四.下载产品资料PDF文档

jtm3103

五,产品封装图 (Package)

Pin Number	Pin Name	Description
1	GND	Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into JTM3103.
2	FB	Feedback Pin (FB). Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.25V.
3	SW	Power Switch Output Pin (SW). SW is the switch node that supplies power to the output.
4	VC	Internal Voltage Regulator Bypass Capacity. In typical system application, The VC pin connect a 1uf capacity to VIN.
5	VIN	Supply Voltage Input Pin. JTM3103 operates from a 8V to 36V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.

(责任编辑：oumao18)