收藏本站
NXP Semiconductors
SSL3250A
Photo flash dual LED driver
8.3.4 Flash mode
The Flash mode allows the main LED to be used at high LED current setting. The Flash
mode current can be set up to 500 mA in both the I 2 C and Direct enable mode.
In I 2 C mode, the current is defined by entering a value between a minimum of 12 and a
maximum of 31 in the current control register. The external resistor R_FL can be used to
scale down the set current. This can be used in the application to enable TxMasking as
described in Section 8.3.6 . The current in the main LED is defined using Equation 3 .
When not using the R_FL resistor, assume a resistor value of 50 k Ω in the equation.
Entering Flash mode can be done either by using the STRB pin or the FLASH_STRB bit in
Flash Strobe register 02h. The duration of the flash can be determined by a timer, STRB
triggering or by a time-out. The flash timing is given by Equation 3 and in Section 8.4.2 .
I LED = --------------- × ( 35 mA + 15 mA × Register )
50 k Ω
R R _ FL
(3)
When using the Direct enable mode, the flash current can be defined by an external
resistor connected to the R_FL pin. The current in the main LED is defined using
Equation 4 . When not using the current set resistor, the flash current will be set to a
default level of 500 mA. The default current is equal to connecting an external current set
resistor of 50 k Ω . Entering Flash mode in Direct enable mode can be done using the EN1
and EN2 pins. The LED will stay on in Flash mode for as long as the enable pins are set to
Flash mode, but is limited to 820 ms maximum by the time-out timer.
I LED = --------------- × 500 mA
50 k Ω
R R _ FL
(4)
When no external current set resistor is used, the R_FL pin can be left unconnected but is
preferably connected to VIN. Never connect the R_FL pin to GND as this will cause
unnecessary reference currents to flow to GND.
Figure 7 illustrates the Flash mode current setting equation for I 2 C, while Figure 8
illustrates the Flash mode current setting equation for the Direct enable mode.
600
I LED (mA)
500
375
250
215
161
125
110
55
0
No
Resistor
66 . 7
100
200
0
12
16
20
24
28
32
Register
Flash current using I 2 C mode
Value (k Ω )
014aaa366
SSL3250A_5
Fig 7.
Flash mode LED current in I 2 C mode
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 16 December 2009
9 of 26
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
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
SST25VF040B-50-4C-ZAE IC FLASH SER 4MB 80MHZ SPI 8CSP
SST25VF040B-80-4I-QAE IC FLASH SER 4MB 80MHZ SPI 8WSON
相关代理商/技术参数
SSL3252 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Smart, simple solutions for the 12 most common design concerns
SSL3252UK/C2,515 功能描述:LED照明驱动器 Photo flash LED 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
SSL33 功能描述:肖特基二极管与整流器 Low VF 3Amp 30v SMD Schottky Rect RoHS:否 制造商:Skyworks Solutions, Inc. 产品:Schottky Diodes 峰值反向电压:2 V 正向连续电流:50 mA 最大浪涌电流: 配置:Crossover Quad 恢复时间: 正向电压下降:370 mV 最大反向漏泄电流: 最大功率耗散:75 mW 工作温度范围:- 65 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SOT-143 封装:Reel
SSL33 R6 制造商:SKMI/Taiwan 功能描述:Diode Schottky 30V 3A 2-Pin SMC T/R
SSL34 功能描述:肖特基二极管与整流器 Low VF 3Amp 40v SMD Schottky Rect RoHS:否 制造商:Skyworks Solutions, Inc. 产品:Schottky Diodes 峰值反向电压:2 V 正向连续电流:50 mA 最大浪涌电流: 配置:Crossover Quad 恢复时间: 正向电压下降:370 mV 最大反向漏泄电流: 最大功率耗散:75 mW 工作温度范围:- 65 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SOT-143 封装:Reel
SSL34 R6 制造商:SKMI/Taiwan 功能描述:Diode Schottky 40V 3A 2-Pin SMC T/R
SSL3401HN/1Y 制造商:NXP Semiconductors 功能描述:SSL3401HN/HVQFN32/REEL13DP//1 - Tape and Reel
SS-L3TQ100-SXA 制造商:Microsemi Corporation 功能描述:EXTENDER FOR A54SX32A-FTQ100 - Trays