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| 型号： | ISL97686IRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 11/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BACKLIGHT 28TQFN |
| 标准包装： | 6,000 |
| 拓扑： | 线性（LDO），PWM，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 汽车，背光，通用型 |
| 频率： | 200kHz ~ 1.2MHz |
| 电源电压： | 9 V ~ 32 V |
| 输出电压： | 75V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
ISL97686
This is typically used in 3D systems to provide a higher current
level in 3D modes, but is not restricted to this application. CSEL
can be switched in operation and updates immediately in direct
PWM mode, and at the start of the next PWM dimming cycle in
other modes.
LED DC DIMMING
It is possible to control the LED current by applying a DC voltage
V DIM to the ISET1/2 pin via a resistor as in Figure 17.
maximum current level that will need to be supported.
Otherwise, on-chip power dissipation will be higher at current
levels above the start-up level. Dimming with this technique
should be limited to a minimum of 10~20% brightness, as LED
current accuracy is increasingly degraded at lower levels.
PWM Dimming Frequency Adjustment
The dimming frequencies of serial interface and ACTL modes are
set by an external resistor at the PWM_SET pin, as shown in
Equation 3:
( 1.665 ) × 10
f PWM = --------------------------------
ISET
V ISET : 1.21V
R DIM
R ISET
V DIM
7
R PWMSET
where f PWM is the desirable PWM dimming frequency and
R PWMSET is the setting resistor.
(EQ. 3)
SPI INTERFACE
ISL97686 has an SPI interface for the daisy chain configuration
of a single controller and multiple LED drivers in Figure 18. The
FIGURE 17. LED CURRENT CONTROL WITH V DIM
If the V DIM is above V ISET 1.21V, the brightness will reduce, and
vice versa. In this configuration, it is important that the control
voltage be set to the maximum brightness (minimum voltage)
level when the ISL97686 is enabled, even if the LEDs are not lit
at this point. This is necessary to allow the chip to calibrate to the
master can control the particular channels of multiple LED
drivers with sharing 4 wires, SDI, SDO, CLK, and CS. Each
serialized dimming data can be encoded 10-bit resolution and
transferred to each driver ICs only at CS pin low period. The LED
driver will start particular channel dimming after loading the
dimming data when the CS level back to high.
SPI
#1
#2
#3
Master
MASTER
SDI
CS
CLK
SDO
SDI
CS
CLK
SDO
SDI
CS
CLK
SDO
CS
DIMMING DATA LATCHED
SDI
(FIRST CHIP)
CH 1
MSB
CH 1
MSB-1
CH 1
MSB- 2
CH 4
LSB+2
CH 4
LSB+1
CH 4
LSB
CLK
CH 1
MSB
CH 1 CH 1
MSB-1 MSB- 2
CH 4
LSB+2
CH 4
LSB+1
CH 4
LSB
SDO
(LAST CHIP)
FIGURE 18. SPI INTERFACE AND CONTROL TIMING
11
FN7953.0
April 23, 2012
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97687IBZ | 功能描述:IC LED DRVR 4 CHAN PWM 28SOIC 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 |
| ISL97687IBZEV1Z | 制造商:Intersil 功能描述:ISL97687 EVAL |
| ISL97687IBZ-T | 功能描述:IC LED DRVR 4 CHAN PWM 28SOIC 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 |
| ISL97687IRTZ | 功能描述:IC LED DRVR 4 CHAN PWM 28TQFN 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 |
| ISL97687IRTZ-T | 功能描述:IC LED DRVR 4 CHAN PWM 28TQFN 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 |
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