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| 型号： | ISL97682IRTZ |
| 厂商： | Intersil |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR PWM CTRL 2CH 16TQFN |
| 标准包装： | 100 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 500kHz ~ 650kHz，900kHz ~ 1.1MHz |
| 电源电压： | 4 V ~ 26.5 V |
| 输出电压： | 45V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
ISL97682, ISL97683, ISL97684
Maximum DC Current Setting
The initial brightness should be set by choosing an appropriate
value for R SET . This should be chosen to fix the maximum
possible LED current as shown in Equation 2 for ISL97682 and
Equation 3 for ISL97683 and ISL97684:
ILED1-20mA
ILED2-20mA
I LEDmax = ---------------
( 804 )
R SET
(EQ. 2)
ILED3-20mA
ILED4-20mA
I LEDmax = ---------------
( 402 )
R SET
(EQ. 3)
ILED_Total_20mA
5
10
DC Current Adjustment
Once R SET is fixed, the LED DC current can be adjusted.
For example, in the 4-channel ISL97684, if the maximum required
LED current (I LED(max) ) is 20mA, rearranging Equation 3 yields
Equation 4:
TIME (ms)
FIGURE 21. PHASE SHIFT 4-Ch LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
R SET = ( 402 ) ? 0.02 = 20.1k Ω
(EQ. 4)
ILED4-20mA
PWM Control
The ISL97682, ISL97683, ISL97684 have high speed 8-bit
digitizers that decode the incoming PWM signal and convert it into
2- 3- or 4- channels of 8-bit PWM current with a phase shift
function that will be described later. During the PWM On period,
the LED peak current is defined by the R SET resistor value. The
average LED current of each channel is controlled by I LEDmax and
the PWM duty cycle in percent shown by Equation 5:
ILED3-20mA
ILED2-20mA
ILED1-20mA
ILED_Total_80mA
I LED ( ave ) = I LEDmax × PWM
(EQ. 5)
5
10
TIME (ms)
When the PWM input = 0, all channels are disconnected and the
I LED is guaranteed to be <5μA in this state.
FIGURE 22. CONVENTIONAL LED DRIVER PWM DIMMING CHANNEL
AND TOTAL CURRENT AT 50% DUTY CYCLE
The PWM dimming frequency is adjusted by a resistor at the
ILED4-20mA
ILED1-20mA
ILED2-20mA
ILED3-20mA
ILED4-20mA
ILED_Total_80mA
ILED3-20mA
ILED2-20mA
ILED1-20mA
ILED_Total_40mA
5
10
15
5
10
TIME (ms)
FIGURE 20. CONVENTIONAL 4-Ch LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
11
TIME (ms)
FIGURE 23. EQUAL PHASE SHIFT LED DRIVER PWM DIMMING
CHANNEL AT 50% DUTY CYCLE
FN7689.1
May 16, 2012
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97682IRTZEVALZ | 功能描述:EVAL BOARD FOR ISL97682 RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:- 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
| ISL97682IRTZR5509 | 功能描述:LED照明驱动器 1 Channel LED Drivers, 16LD TQFN 3X3 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 |
| ISL97682IRTZ-T | 功能描述:IC LED DVR PWM CTRL 2CH 16TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| ISL97682IRTZ-TK | 功能描述:IC LED DVR PWM CTRL 2CH 16TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| ISL97682IRTZ-TR5509 | 功能描述:LED照明驱动器 1 Channel LED Driver, 16LD TQFN 3X3, T&R 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 |
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