The JTM6285 also provides a sophisticated range of protecti

1.产品概述         2.产品特点
3.应用范围                       4.产品封装图
5.电路原理图             6.产品PCB
7.产品BOM 8.产品PDF文档
9.功能概述

一,产品概述(General Description)
The document describes a high efficiency LED driver designed to drive an LED driver at a current of 320 mA from an inputvoltage range of 5 VDC to 32 VDC, output support 2~16 series 1W LED.
The JTM6285 also provides a sophisticated range of protection features including output LED open faults and soft-start function.Accurate hysteretic thermal shutdown ensures safe average PCB temperatures under all conditions. Design with very low parts
count.
This document contains the converter specification, schematic, PCB diagram, conducted EMI measurements, bill of materials and typical performance characteristics.

The JTM6285 regulator is fixed frequency PWM Boost (step-up) LED constant current driver,
capable of driving Series 1W/3W/5W 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 JTM6285 could directly drive 11 Series 1W LED units at VIN>12V .

The PWM control circuit is able to adjust the duty ratio linearly from 0 to 95%. 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 32V Input Voltage Range
2.0.22V FB adjustable LED drive current
3.Directly drive 11 Series 1W LED at VIN>=12V
4.Fixed 180KHz Switching Frequency
5.Max. 4A Switching Current Capability
6.Up to 94% efficiency
7.Excellent line and load regulation
9.EN PIN TTL shutdown capability &
10.With PWM Dimming Function
11.Internal Optimize Power MOSFET
12.Built in Soft-Start Function
13.Built in Frequency Compensation
14.Built in Thermal Shutdown Function
15.Built in Current Limit Function
16.Available in TO252-5L package

三,应用范围 (Applications)
1.LED Lighting
2.Boost constant current driver
3.Monitor LED Backlighting
4.7’ to 15’ LCD Panels

四,产品封装图 (Package)

Pin Number	Pin Name	Description
1	GND	Ground Pin.
2	EN	Enable Pin. Drive EN pin low to turn off the device, drive it high to turn it on. Floating is default high.
3	SW	Power Switch Output Pin (SW).
4	VIN	Supply Voltage Input Pin. JTM6285 operates from a 3.6V to 32V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.
5	FB	Feedback Pin (FB). The feedback threshold voltage is 0.22V.

五,电路原理图

六, 产品PCB

七.产品BOM

Item	Qty	Ref Des	Description	Mfg Part Number	Mfg
1	2	C1,C2	1uF,50V,Ceramic,X7R,0805	C2012X7R1H105K	TDK
2	1	C3	100uF,50V, Electrolytic,(8x11.5)	YXA-50V-100uF	Rubycon
3	1	Cin	100uF,50V, Electrolytic,(8x11.5)	YXA-50V-100uF	Rubycon
4	1	Cout	100uF,63V, Electrolytic,(8x11.5)	YXA-63V-100uF	Rubycon
5	1	D1	60V,3A,Schottky Barrier Rectifier,SMC	SS36	Fairchild
6	1	D2	56V,0.5W,Zener,MINI MELF	ZMM55C56	ICM
7	1	L1	47uH,3A,Toroidal,10*4
8	1	L2	500uH,3A,Toroidal,10*4
9	1	R1	1KΩ,1%,1/10W,Thick Film,0805	RL0805xR-071001L	Yageo
10	1	RCS	0.68Ω,1%,1/4 W,Thick Film,1206	RL1206xR-07R680L	Yageo
11	1	U1	H&M semi,JTM6285,TO252-5L	JTM6285	H&M SEMI

八.产品PDF文档

JTM6285

九,功能概述