外驱MOSOS管,PSR控制模式，无光耦，无431,JTM900B内置软启动和反馈网络清零控制，大大降低启动时电流过冲

　　一,目录
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

二,产品概述(General Description)
JTM900B is a high performance, high power factor Primary Side Regulation (PSR) and
Secondary Side Regulation (SSR) flyback PWM controller special for LED lighting

applications. The IC adopts unique super-PFC/PSRTM which can support both PSR and SSR
applications.
JTM900B is pin compatible with mainstream PFC High Precision LED Output Current technique, which can achieve less than 10% THD for universal line input.

JTM900B has built-in Load CC Compensation and AC Line CC Compensation function, which can further increase LED output CC accuracy. The IC has Max. 90KHz Frequency Clamping function and soft totem pole Gate driver to improve system conduction and radiation EMI. The IC will Clear External EAFeedback Network before IC power on, which can reduces startup LED current spike. The IC also has Soft Start control during power on period. In JTM900B, the proprietary “Frequency Adjusting”
can help to improve THD performance, while ensures audio noise free operation.
JTM900B integrates functions and protections of Under Voltage Lockout (UVLO), LED Open/Short Protection, VCC Over Voltage Protection (OVP), Load Over Voltage Protection (Load OVP), Soft Start, Cycle-by-cycle Current Limiting (OCP), Burst Mode
Control @ Light Loading, GD Clamping, VCC Clamping, etc.

JTM900B is available in SOP-8 and DIP-8 packages.

三.产品特点(Features)
1、外驱MOSOS管 ,SOP-88封装
2、PSR控制模式，无光耦，无431。
3、±3% 的输出恒流精度。
4、专利的‘Super-PFC/PSRTM ’技术。
5、专利的‘Min -THDTM ’技术实现THD＜10%。
6、内置90KHz铅频，EMI 性能良好。
7、内置软启动和反馈网络清零控制，大大降低启动时电流过冲。
8、内置软启动，超低启动电流，管脚浮空保护。
9、输出OVP,OLP，VDD过压，欠压及钳位保护,LED短路/开路保护。

四,应用范围 (Applications)

五,产品封装图 (Package)

六,电路原理图

七, 产品PCB

八.产品BOM

序号	名称	规格	数量	位号
1	贴片电容	1nF/50V,0805,X7R 10%	1	C3
2	CBB电容	68nF/450V，P=10mm 10%	1	C4
3	贴片电容	470nF/50V,0805,X7R 10%	1	C6
4	贴片电容	20PF/50V,0805,C0G/NP0 10%	2	C8，C9
5	贴片电容	1nF/1kV,1206,10%	1	C10
6	电解电容	22uF/50V,105℃,6.3*11,±20%	1	C2
7	电解电容	220uF/50V,10*17mm ,LOWESR ,105℃ 20%	2	C11,C13
8	贴片电容	330pF/1kV,1206 10%	1	C12
9	安规电容 X2	X2X2,0.047uF/275Vac,P=10mm0 047uF/275Vac P=10mm	1	CX1
10	安规电容 X2	X2,0.068uF/275Vac,P=10mm	1	CX2
11	安规电容 Y1	Y1,2.2nF/400V，P=10mm	1	CY1
12	贴片电阻	4.7k,1206,5%	2	R1,R2
13	贴片电阻	150k,1206,5%	2	R6,R7
14	贴片电阻	1M,1206,5%	2	R8,R9
15	贴片电阻	15k,0805,5%	1	R10
16	贴片电阻	7.5M,1206,5%	2	R11,R12,
17	贴片电阻	150k,0805,1%	1	R15
18	贴片电阻	0R,1206,5%	1	R16
19	贴片电阻	1 k,1206,5%	1	R17
20	贴片电阻	100R,1206,5%, ,	1	R19
21	贴片电阻	56k,1206,5%	2	R20,R25