收藏本站
LV5026MC
T
Ipk × 2 × ( Duty × T )/ T = ILED
Ipk × DutyI
Ipk ×
Rcs
Rcs ×
2 ILED
Ipk
Given that the period when current flows into coil is
T_c+T_d
DutyI =
1
2 × ILED                   VREF_IN
(1) since
VFEF_IN  DutyI × VFEF_IN
= (2)
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)
Rs: External sense resistor
Vzd: Zener diode voltage (REF_IN pin)
Since formula for LED current is different between on period and off period as shown above,
× T_c = L × T_d
Vac-V ? V ?
Ipk × (3)
Based on the result of (3) and (4), T_d = DutyI × T × Vac
L
Since T_c + T_d = DutyI × T , T_c = DutyI × T - T_d (4)
To obtain L from the equation (1), (3), (5),
Vac-V ?
(5)
L ×
V ? × DutyI
2 × ILED
× DutyI × T =
Vac - V ?
Vac
=
V ?
2 × ILED
×
1
? osc
×
Vac - V ?
Vac
× ( DutyI ) 2 (6)
Since LED and inductor are connected in serial in non-isolation mode, LED current flows only when AC voltage exceed
VF.
√ 2 × Vrms
VF
Vac
(AC voltage, R.M.S)
Inductor current
Arcsin (Vf/ √ 2Vrms)
Arcsin (Vf/ √ 2Vrms)
90
Arcsin ( √ 2Vrms/ √ 2Vrms)
=90 (Deg)
Given that the ratio of inductor current to AC input is DutyAC.
V ?
90 - arcsin ( √ 2 Vrms )
DutyAC =
Since the period when the inductor current flows are limited by DutyAC, the formula (6) is represented as follows:
L =
V ?
2 × ILED
×
1
? osc
×
Vac - V ?
VIN
× ( DutyI ) 2 ×
V ?
90 - arcsin ( √ 2 Vrms )
90
2
(7)
No.A2042-7/16
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