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| 型号： | ISL97635AIRZ |
| 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： | 6 |
| 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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ISL97635A
and the voltage drop due to flowing through the ESR of the
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 in Equation 19 also
brings up a 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 users need to select an output capacitor with
low ESD and with a enough input ripple current capability.
.
IIN0
IIN1
IIN2
V OUT
Output Ripple
Δ V Co can be reduced by increasing C O or f S , 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.
A larger output capacitor will also ease the driver respond
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
capacitors are suitable for the notebook display backlight
applications.
FIGURE 30. GROUPING MULTIPLE CHANNELS FOR HIGH
CURRENT APPLICATIONS
Multiple Drivers Operation
For large LCD panels where more than 6 channels of LEDs
are needed, multiple ISL97635As with each driver having its
own supporting components can be controlled together with
the common SMBus. While the ISL97635A does not have
extra pins strappable slave address feature, a 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 EN/PWMI signal is
common to all drivers.
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
SMBCLK
SMBDAT
EN/PWMI
SMBCLK
SMBDAT
EN/PWMI
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 ’s, and therefore, a suitable current
SMBCLK
SMBDAT
EN1
EN2
FIGURE 31. MULTIPLE DRIVERS OPERATION
rated Schottky diode must be used.
16-Bit Dimming
Applications
High Current Applications
Each channel of the ISL97635A 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
The SMBus controlled PWM and DC dimmings can be
combined to effectively provide 16 bits of dimming capability,
which can be valuable for automotive and avionics display
applications. Figure 32 illustrates one programming example
where 256 steps of PWM dimming can be programmed
between each DC dimming steps or vice versa.
FN6564.2
December 22, 2008
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97635AIRZ-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 |
| ISL97635AIRZ-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 |
| ISL97635AIRZ-TKR5306 | 制造商:Intersil Corporation 功能描述: |
| ISL97635IRZ | 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-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 |
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