收藏本站
NXP Semiconductors
SSL21081T/2T/3T/4T
GreenChip drivers for LED lighting
8.4.1 UnderVoltage LockOut (UVLO)
When the voltage on the VCC pin drops lower than V CC(stop) , the IC stops switching. An
attempt is then made to restart by supplying V CC from the HV pin voltage.
8.4.2 Leading-Edge Blanking (LEB)
To prevent false detection of the short-winding or overcurrent, a blanking time following
switch-on is implemented. When the internal MOSFET switch turns on there can be a
short current spike due to capacitive discharge of voltage over the drain and source.
During the LEB time (t leb ), the spike is disregarded.
8.4.3 OverCurrent Protection (OCP)
The SSL2108X contains a highly accurate peak current detector. It triggers when the
voltage at the SOURCE pin reaches the peak-level V th(ocp)SOURCE . The current through
the switch is sensed using a resistor connected to the SOURCE pin. The sense circuit is
activated following LEB time t leb . As the LED current is half the peak current (by design), it
automatically provides protection for maximum LED current during operation. There is a
propagation delay between overcurrent detection and the actual closure of the switch
t d(ocp-swoff) . Due to the delay, the actual peak current is slightly higher than the OCP level
set by the resistor in series to the SOURCE pin.
8.4.4 OverTemperature Protection (OTP)
When the internal OTP function is triggered at a certain IC temperature (T th(act)otp ), the
converter stops operating. The OTP safe-restart protection and the IC restarts again with
switching resuming when the IC temperature drops lower than T th(rel)otp .
8.4.5 Brownout protection
Brownout protection is designed to limit the lamp power when the input voltage drops
close to the output voltage level. Since the input power has to remain constant, the input
current would otherwise increase to a level that is too large for the input circuitry. For the
SSL2108X, there is a maximum limit on the on-time of the switch t on(high) . The rate of
current rise in the coil during the on-phase is proportional to the difference between input
voltage and output voltage. Therefore, the peak current cannot be reached before t on(high)
and as a result the average output current to the LEDs is reduced.
Using the SO12 package, the t on(high) can be lowered by connecting a capacitor to the
TONMAX pin. The external capacitor is charged during the primary stroke with I TONMAX . If
V TONMAX level is reached before the t on(high) time, the switch is turned off and the
secondary stroke starts. When no capacitor is connected to the pin, V TONMAX is reached
quickly, shorter than the minimum limit of one microsecond. In this case, or in case the
TONMAX pin is grounded, the internal time constant, t on(high) determines the maximum
on-time.
8.4.6 Short-Winding Protection (SWP)
SWP activates if there is a steep rising current through the MOSFET and thus through the
external resistor connected to the SOURCE pin. This current can occur when there is a
short from the freewheel diode. Additionally, it occurs due to a small/shorted inductor
between the input voltage and the DRAIN pin. If the voltage on the SOURCE pin is greater
than 1.5 V, latched protection is triggered following LEB time t leb . In addition, if V CC drops
lower than V CC(rst) the IC resets the latched protection mode.
SSL21081T_2T_3T_4T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3.1 — 22 February 2012
? NXP B.V. 2012. All rights reserved.
8 of 23
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
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
SST25VF016B-50-4C-S2AF-T IC FLASH SER 16M 50MHZ SPI 8SOIC
SST25VF020-20-4C-QAE-T IC FLASH SER 2MB 20MHZ SPI 8WSON
SST25VF020B-80-4C-QAE-T IC FLASH SER 2MB 80MHZ SPI 8WSON
SST25VF032B-66-4I-S2AF IC FLASH SER 32M 66MHZ SPI 8SOIC
相关代理商/技术参数
SSL21081T/1118 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述:
SSL21082 制造商:NXP 功能描述:LOW POWER OFF LINE SMPS PRIMARY SWITCHER
SSL21082AT/1,118 制造商:NXP Semiconductors 功能描述:LED DRVR 9V/12V 12-Pin SO T/R 制造商:NXP Semiconductors 功能描述:SSL21082AT/SO12/REEL13//1 - Tape and Reel 制造商:NXP Semiconductors 功能描述:IC LED DVR DIMMABLE FET 12SOIC
SSL21082DB01,598 功能描述:LED 照明开发工具 non-dim 100Vac 125mA out Buck Ref des RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
SSL21082DB02,598 功能描述:LED 照明开发工具 non-dim 100V 15W Buck Eval brd RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
SSL21082DB1063,598 制造商:NXP Semiconductors 功能描述:SSL21082 - 120V 9W HIGH PF REFERENCE DESIGN - Boxed Product (Development Kits) 制造商:NXP 功能描述:NXP SSL21082DB1063,598 Development Kits
SSL21082T 制造商:未知厂家 制造商全称:未知厂家 功能描述:The SSL2108X is a range of high-voltage Integrated Circuits (ICs), intended to drive LED lamps in general lighting applications.
SSL21082T/1,118 功能描述:LED照明驱动器 HI VOLTAGE LED DRVR 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