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LM3421, LM3421-Q1
LM3423, LM3423-Q1
SNVS574E – JULY 2008 – REVISED MAY 2013
V IN
BLOCK DIAGRAM
www.ti.com
EN
6.9V LDO
Regulator
V CC
820k
V IN UVLO
HYSTERESIS
UVLO
(4.1V)
V CC UVLO
REFERENCE
Standby
1.235V
500k
nDIM
1.24V
23 P A
TLIM Thermal
Limit
Dimming
V CC
DPOL
DDRV
OVLO
LatchOff
V IN /25
Start new on time
Reset
Dominant
PGND
V CC
RCT
LEB
W = 150 ns
S
R
Q
GATE
PGND
COMP
RPD
1.235V
PWM
23 P A
OVP
HYSTERESIS
EN
CSH
HSP
HSN
IS
LEB
800 mV
0.245V
1.0V
LOGIC
CURRENT
LIMIT
LED CURRENT LOW
OVLO
11.5 P A
1.24V
OVP
LRDY
LED CURRENT HIGH
LatchOff
TIMR
FLT
AGND
1.6V
Grey pins are available in the LM3423 only.
In the LM3421, TIMR is internally shorted to AGND.
TLIM
V CC UVLO
1.24V
THEORY OF OPERATION
The LM3421/23 are N-channel MosFET (NFET) controllers for buck, boost and buck-boost current regulators
which are ideal for driving LED loads. The controller has wide input voltage range allowing for regulation of a
variety of LED loads. The high-side differential current sense, with low adjustable threshold voltage, provides an
excellent method for regulating output current while maintaining high system efficiency. The LM3421/23 uses a
Predictive Off-time (PRO) control architecture that allows the regulator to be operated using minimal external
control loop compensation, while providing an inherent cycle-by-cycle current limit. The adjustable current sense
threshold provides the capability to amplitude (analog) dim the LED current and the output enable/disable
10
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相关代理商/技术参数
LM3423MHX 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM3423MHX/NOPB 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LM3423Q0 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MH 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MH/NOPB 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
LM3423Q0MHX 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers
LM3423Q0MHX/NOPB 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor
LM3423Q1 制造商:NSC 制造商全称:National Semiconductor 功能描述:N-Channel Controllers for Constant Current LED Drivers