收藏本站
NXP Semiconductors
SSL152x
SMPS ICs for mains LED drivers
8.4 Valley switching
A new cycle is started when the primary switch is switched on (see Figure 4 ). After a
certain time (determined by the oscillator voltage RC and the internal regulation level), the
switch is turned off and the secondary stroke starts. The internal regulation level is
determined by the voltage on pin REG.
After the secondary stroke, the drain voltage shows an oscillation with a frequency
approximately equal to the value given by Equation 1 :
----------------------------------------------
1
2 × π × ( L p × C p )
(1)
where:
L p = primary self-inductance
C p = parasitic capacitance on drain node
As soon as the oscillator voltage becomes high again and after the secondary stroke has
ended, the circuit waits for a low drain voltage before starting a new primary stroke.
Figure 4 shows the drain voltage together with the valley signal, the signal indicating the
secondary stroke and the RC voltage.
The primary stroke starts some time before the actual valley at low ringing frequencies,
and some time after the actual valley at high ringing frequencies.
primary
stroke
secondary
stroke
secondary
ringing
drain
valley
secondary
stroke
A
RC
regulation level
B
oscillator
mgt423
A: Start of new cycle with valley switching.
B: Start of new cycle in a classical system.
Fig 4.
Signals for valley switching
SSL152X
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 17 September 2010
? NXP B.V. 2010. All rights reserved.
6 of 20
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
SSL1623PH/N1,112 IC LED DRVR HIG PWR AC IN 16-DIP
SSL1750T/N1,518 IC LED DRVR HI PWR AC IN 16-SOIC
SSL2103T/1,518 IC LED DRIVER SMPS DIMM 14SOIC
SSL21081T/1,118 IC LED DRIVER 300V 8-SOIC
SSL21153T/1,118 IC DRIVER LED SSL 7SOIC
SSL3250AHN/C1,528 IC LED DRVR PHOTO FLASH 16-HVQFN
SST25LF020A-33-4C-QAE-T IC FLASH SER 2MB 33HZ SPI 8WSON
SST25VF010A-33-4I-QAE-T IC FLASH SER 1MB 33MHZ SPI 8WSON
相关代理商/技术参数
SSL1522T/N2518 制造商:NXP Semiconductors 功能描述:IC LED DRVR SOIC
SSL1522T/N2-T 功能描述:LED照明驱动器 SSL DRIVER 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
SSL1523 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SSL1523 high power factor 5 W LED driver for universal
SSL1523AP/N2,112 功能描述:LED照明驱动器 SMPS 276V 1.9mA 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
SSL1523DB/UNIVMAINS,598 制造商:NXP Semiconductors 功能描述:- Boxed Product (Development Kits) 制造商:NXP Semiconductors 功能描述:Univ. Mains hi PF 5W LED Drvr demo brd
SSL1523P 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:SMPS ICs for mains LED drivers
SSL1523P/N2 功能描述:LED照明驱动器 SSL DRIVER 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
SSL1523P/N2,112 功能描述:LED照明驱动器 SSL DRIVER 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