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| 型号： | ISL97635IRZ |
| 厂商： | Intersil |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHT/RGB BCKLGT 24QFN |
| 标准包装： | 75 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 600kHz，1.2MHz |
| 电源电压： | 6 V ~ 24 V |
| 输出电压： | 34.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
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ISL97635
output capacitor. The ripple voltage can be shown as
Equation 21:
Δ V CO = ( I O ? C O × D ? f S ) + ( ( I O × ESR )
(EQ. 21)
The conservation of charge principle also brings up the fact
that during the boost switch Off-period, the output capacitor
is charged with the inductor ripple current minus a relatively
small output current in boost topology. As a result, the user
needs to select an output capacitor with low ESD and
enough input ripple current capability.
Output Ripple
Δ V Co , can be reduced by increasing Co or f SW , or using
small ESR capacitors. In general, ceramic capacitors are the
best choice for output capacitors in small to medium sized
LCD backlight applications due to their cost, form factor, and
low ESR.
.
V OUT
IIN0
IIN1
IIN2
FIGURE 30. GROUPING MULTIPLE CHANNELS FOR HIGH
CURRENT APPLICATIONS
A larger output capacitor will also ease the driver response
during PWM dimming Off-period due to the longer sample
and hold effect of the output drooping. The driver does not
need to boost harder in the next On-period that minimizes
transient current. The output capacitor is also needed for
compensation, and, in general 2x4.7μF/50V ceramic
SMBCLK
SMBDAT
EN/PWMI
SMBCLK
SMBDAT
EN/PWMI
capacitors are suitable for notebook display backlight
applications.
Schottky Diode
A high speed rectifier diode is necessary to prevent
excessive voltage overshoot, especially in the boost
configuration. Low forward voltage and reverse leakage
current will minimize losses, making Schottky diodes the
preferred choice. Although the Schottky diode turns on only
during the boost switch Off-period, it carries the same peak
current as the inductor, and therefore, a suitable current
rated Schottky diode must be used.
Applications
SMBCLK
SMBDAT
EN1
EN2
FIGURE 31. MULTIPLE DRIVERS OPERATION
STEP 255 PWM CONTROL
STEP 0~255 DC CONTROL
STEP 254 PWM CONTROL
STEP 1 PWM CONTROL
STEPS 0~255 DC
STEP 0 PWM CONTROL
High Current Applications
Each channel of the ISL97635 can support up to 35mA. For
applications that need higher current, multiple channels can
be grouped to achieve the desirable current. For example,
the cathode of the last LED can be connected to IIN0 to IIN2,
this configuration can be treated as a single string with
105mA current driving capability.
25
FIGURE 32. 16-BIT DIMMING ILLUSTRATION
Multiple Drivers Operation
For large LCD panels where more than 8 channels of LEDs
are needed, multiple ISL97635s with each driver having its
own supporting components can be controlled together with
the common SMBus. While the ISL97635 does not have
extra pins strappable slave address feature, separate EN
signal can be applied to each driver for asynchronous
operation. A trade-off of such scheme is that an exact faulty
channel cannot be identified if the PWMI/EN signal is
common to all drivers.
FN6434.2
December 22, 2008
相关PDF资料 |
PDF描述 |
|---|---|
| ISL97636AIRZ | IC LED DRIVR WHITE BCKLGT 24-QFN |
| ISL97636IRZ-TK | IC LED DRIVR WHITE BCKLGT 24-QFN |
| ISL97671AIRZ | IC LED DVR PWM CTRL 6CH 20QFN |
| ISL97672AIRZ | IC LED DRVR LOW DIMMING 20QFN |
| ISL97672BIRZ | IC LED DRVR BACKLIGHT 20QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97635IRZ-T | 功能描述:IC LED DRVR WHT/RGB BCKLGT 24QFN 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 |
| ISL97635IRZ-TK | 功能描述:IC LED DRVR WHT/RGB BCKLGT 24QFN 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 |
| ISL97636AIRZ | 功能描述:LED照明驱动器 6-CH 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 |
| ISL97636AIRZ-T | 功能描述:IC LED DRIVR WHITE BCKLGT 24-QFN 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 |
| ISL97636AIRZ-TK | 功能描述:IC LED DRIVR WHITE BCKLGT 24-QFN 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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