收藏本站
LV5026MC
LED current and inductande setting
? Relation ship beween REF_IN and CS pin voltage(Power Factor Crrection(PFC))
The output current value is the average of the current value that flows during one cycle. The current value that flows into
coil is a triangular wave shown in the figure below. Make sure to set Ipk so that (average of current value at one cycle)
is equal to (LED current value).Ipk is set by the relationship between REF_IN voltage and Rcs voltage.
This relationship make Power Factor Correction (PFC).Therefore, it is available to make LED current a sine curve.
? Setting Zener voltage
Vzd depend on LED voltage (VF). Choose Zener diode around Vf (LED voltage).When VAC voltage is lower than Vf,
LED operation is not normal. Using Zener diode prevents incorrect operating during VAC voltage lower than Vf. In
detail, refer to [LED current and inductance setting]
In case of REF_IN pin open, this error amplifier negative input(-) is under control of internal VREF voltage
(0.605Vtyp).
a blockdiagram in outline
L
FET current
Vac
VREF (0.605V typ)
R1
Vzd
CLK
Q
OUT
REF_IN
REF_IN
CS
+
-
-
RESET
FET current
VREF
T
R2
(0.605V typ)
FET
ON
Rcs
Ton
Toff
OFF
( Vac-Vzd ) × R1+R2
Ipk =
Rcs
R2
Ipk: peak inductor current
Vf: LED forward voltage drop
Vac: effective value, R.M.S value
VREF: Built-in reference voltage (0.605V)
VREF_IN: REF_IN voltage (6 pin)
LED current and inductance setting
It is available to use both no-isolation and isolation applications.
Rs: External sense resistor
Vzd: Zener diode voltage (REF_IN pin)
(For non-isolation application)
The output current value is the average of the current value that flows during one cycle. The current value that flows into
coil is a triangular wave shown in the figure below. Make sure to set IL_PK so that (average of current value at one cycle)
is equal to (LED current value).
Vac
a blockdiagram in outline
LED
L
Inductor current
Vac
REF_IN
VREF (0.605V typ)/built-in reference
R1
Vzd
CLK
Q
ILED slope is proportion to
Vac voltage (REF pin voltage)
REF_IN
CS
+
-
-
RESET
OUT
FET
T
ON
R2
VREF
(0.605V typ)
Rcs
Ipk
IL = Vac/L × T
OFF
Ipk = (Vac-Vf)/L × T_c
= Vf/L × T_d
Inductor
current
T_c
FET_on
T_d
FET_off
T (1cycle)
IL = Vf/L × T
No.A2042-6/16
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
LV5213LP-TE-L-E IC LED DVR 3CH CELL PHONE VCT16
LV5216CS-TE-L-E IC LED DRIVER 10CH CELL 36WLP
LV5217GP-TE-L-E IC LED DVR 3CH CELL PHONE VCT16
LV8498CT-TE-L-H IC MOTOR DRIVER S111 WLP
LXC100-4200SW POWER SUPPLY LED 100W 4200MA
LXC120-4900SW POWER SUPPLY LED 120W 4900MA
LXC150-5950SW POWER SUPPLY LED 150W 5950MA
LXC25-2080SW POWER SUPPLY LED 25W 2080MA
相关代理商/技术参数
LV5026MCGEVB 制造商:ON Semiconductor 功能描述:EVAL BD FOR LV5026MCGEVB - Bulk 制造商:ON Semiconductor 功能描述:BOARD EVAL FOR LV5026MC
LV5026M-TLM-H 功能描述:LED照明驱动器 LED DRIVER IC 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
LV5027M 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LED Driver IC
LV5027M-TLM-H 功能描述:LED照明驱动器 LED DRIVER IC 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
LV5028TT 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LED Driver IC
LV5028TT-TLM-H 功能描述:LED照明驱动器 LED DRIVER IC 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
LV5029MD 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LED Driver IC for LED Lighting
LV5029MD-BH 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