JTM3350 is a highly integrated and cost effective Light Emi

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 10.相关产品

一,产品概述(General Description)

       JTM3350 is a highly integrated and cost effective Light Emitting Diode (LED) driver optimized for LCD monitor and LCD TV backlighting application. It provides a high performance LED backlight solution with minimized BOM count.
      The JTM3350 contains a PWM boost driver which uses current mode control and fixed frequency operation to regulate the LED current. The LED current is sensed through an external current sense resistor. The voltage across the sensing resistor is compared with reference level of 200mV, the error is amplified to
control the pulse width of the power switch thus to regulate the current flowing the LED.
      The JTM3350 offers external low frequency PWM (LPWM) dimming method for a wide range of dimming control.

The JTM3350 offers comprehensive protection such as power MOSFET over current protection (OCP), output over voltage protection (OVP), IC power supply under voltage lockout (UVLO), and LED open protection
二.产品特点(Features)

Current Mode PWM Controller with Good Dynamic Response
10V to 35V Input Voltage Range
External PWM Dimming Mode
Over Voltage Protection
Over Current Protection
Under Voltage Lockout (UVLO)
Thermal Shutdown

三,应用范围 (Applications)

LCD Monitor
LCD TV
Flat panel display

四,产品封装图 (Package)

Pin Num	Pin Name	I/O	Description
1	VIN	P	Power Supply
2	GATE	O	Gate Driver Output Pin
3	GND	P	Ground
4	SENSE	I	Current Sense Input
5	FB	I	LED Current Feedback Input
6	COMP	I	Boost Converter Loop Compensation Pin
7	OVP	I	Over Voltage Protection Sense Input
8	DIM	I	External PWM Dimming Control

五,电路原理图

六, 产品PCB
(略)
七.产品BOM
(略)
八.产品PDF文档

JTM3350

九,功能概述

Function Description

General Operation

The JTM3350 is a LED driver designed for boost DC-DC converters in a constant frequency
mode. The controller implements a peak current mode control scheme and an internal GM amplifier to
accurately control the output current over a wide input and load conditions.
Low frequency PWM dimming input that can accept an external control signal with a duty ratio of 1%-

100%.

JTM3350 offers comprehensive protection features to protect the system in various fault

conditions such as output over voltage protection, boost diode disconnection protection and output
short circuit protection. The cycle-by-cycle current limit function limits the maximum current flowing
through the external MOSFET. The over temperature protection ensures that the system will not run
into condition of thermal runaway and blow up.

UVLO

An under-voltage lockout protection feature with a hysteresis of about 500mv is provided for VIN.
When the voltage at this pin exceeds a threshold of approximately 7.5V (typ), the IC starts the normal
operation. If the voltage at this pin drops below a Threshold of approximately 7 (typ) V, the IC stops
switching operation. The IC resumes switching operation when the voltage at pin VIN increases to a
voltage above 7.5V.

Start up

JTM3350 is enabled by applying a voltage of greater than approximately 2.5V to PWM pin. An on-chip
internal 150k oJTM pull down resistor is inserted between PWM pin and ground. When the first rising
edge is applied to PWM input, also the pin of PWM is logic high, the JTM3350 will power up
immediately, and remains power up until the PWM input has been hold low for at least 50ms(typ), at
this time the chip will enter sleep mode. At sleep mode, the power of the JTM3350 will be lower
than 400uA (typ).
Once JTM3350 is enabled the internal 5V regulator will be activated to source a current less than 4mA
to the whole chip.
When PWM is active high, the JTM3350 checks the topology connection first. The chip monitors the
OVP pin to see if the Schottky diode (boost diode) is connected or the boost output is short to GND, if
the voltage at OVP pin is lower than 100mV, the output will be disabled. The JTM3350 will also check
other faults (UVLO, OCP and OTP), if there is no fault, then the boost converter will boost up the
output with the internal soft start.

十,相关产品

隆压型LED射灯驱动IC

型号	工作电压范围	输出电流	输出电	线性	效率	工作频率	调光功能	封装	替代型号
型号	工作电压范围	输出电流	流精度	调整率	效率	工作频率	调光功能	封装	替代型号
JTM4115	6.0V-40V	1.2A	3%	1.50%	98%	1MHz(max)	PWM调光	SOT89-5	PT4115/PAM2861/SN3350/CL6808
JTM4115ES	6.0V-40V	1.2A	3%	1.50%	98%	1MHz(max)	PWM调光	ESOP8	PT4115/PAM2861/2/PT4205
JTM4115MR	6.0V-40V	1.2A	3%	1.50%	98%	1MHz(max)	PWM调光	SOT-26	ZXLD1350/ZXLD1360/PT4211
JTM2806	2.0V-6.5V	800mA	10.00%	0.45%	92%	1.4 MHz	PWM调光	SOT-25	PAM2804
JTM1350	5.5V-36V	2.5A	1%		96%	1MHz	PWM调光	SOT-26
JTM9911	2.5V-100V	2.5A	1%		90%	1MHz	PWM调光	SOT-26	MH6206
JTM6103	6.0V-100V	3A	3%		95%	200KHz	PWM调光	SOT-26
JTM4101	8V-45V	3A	3%		95%	220KHz		ESOP8
JTM4103	8V-40V	4A	3%		95%	220KHz	PWM调光	TO252-5L
JTM4105	8V-40V	5A	3%		95%	220KHz		TO263-5L
JTM3106	5.0V-36V	1.5A	2%		96%	380KHz	PWM调光	SOP-8
JTM3101	4.5V-45V	2A	2%		83%	150KHz	PWM调光	ESOP8
JTM3102	8V-45V	3A	2%		89%	150KHz		ESOP8
JTM3109	8V-40V	3A	2%		89%	180KHz		SOP8
JTM3108	8V-40V	3.5A	2%		87%	180KHz	PWM调光	ESOP8
JTM3112	8V-40V	2A	2%		89%	110KHz		SOP8
JTM3113B	7V-40V	2.5A	2%		89%	250KHz		ESOP8
JTM3115	8V-40V	5A	2%		86%	150KHz		TO263-5L