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参数资料
| 型号： | ISL97693IRTZ |
| 厂商： | Intersil |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR BACKLIGHT 16TQFN |
| 标准包装： | 100 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 频率： | 400kHz ~ 1.5MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 26V |
| 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 |
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ISL97692, ISL97693, ISL97694A
Current Matching and Current Accuracy
Each channel of the LED current is regulated by a current sink
circuit.
Note that there will be also an initial in-rush current to C OUT when
V IN is applied. This is determined by the ramp rate of V IN and the
values of C OUT and L.
The LED peak current is set by the external R SET resistor
according to Equation 1. The current sink MOSFETs in each LED
driver channel output are designed to run at ~300mV to optimize
power loss versus accuracy requirements. The sources of errors
VIN
UVLO
(RISING)
of the channel-to-channel current matching come from internal
amplifier offsets, internal layout and reference accuracy. These
parameters are optimized for current matching and absolute
current accuracy. Absolute accuracy is also determined by the
external resistor R SET , and so a 0.1% tolerance resistor is
recommended.
Dynamic Headroom Control
The ISL97692/3/4A feature a proprietary Dynamic Headroom
Control circuit that detects the highest forward voltage string or
effectively the lowest voltage on any of the channel pins. When
this lowest channel voltage is lower than the short circuit
threshold, V SC , such voltage will be used as the feedback signal
for the boost regulator. The boost makes the output to the correct
level, such that the lowest channel pin is at the target headroom
VO
SOFT-START
(7ms)
EN
PWMI
ICHn
Power-Off Sequence
FEEDBACK
REGULATION
ESTABLISHED
voltage. Since all LED stacks are connected to the same output
voltage, the other channel pins will have a higher voltage, but the
regulated current source circuit on each channel will ensure that
each channel has the same current. The output voltage will
regulate cycle-by-cycle and it is always referenced to the highest
forward voltage string in the architecture.
Soft-Start
Once the ISL97692/3/4A is powered up and the EN pin is taken
high, the boost regulator will begin to switch and the current in
the inductor will ramp-up. The current in the boost power switch
is monitored and the switching is terminated in any cycle where
the current exceeds the current limit. The ISL97692/3/4A
includes a soft-start feature where this current limit starts at a
low value (350mA). This is stepped up to the final 2.8A current
limit in 7 further steps of 350mA. These steps will happen over
typically 7ms, and will be extended at low LED PWM frequencies
VIN
VO
EN
PWMI
ICHn
V UVLO - 150mV
BOOST CONVERTER
TURNED OFF
t OFF AFTER REACHING
{V UVLO - 150mV}
DEPENDS ON APPLICATION
if the LED duty cycle is low. This allows the output capacitor to be
charged to the required value at a low current limit and prevents
high input current for systems that have only a low to medium
output current requirement.
17
Operation with Input Voltage Greater than
5.5V
The ISL97692/3/4A boost regulator can operate from an input
voltage higher than 5.5V, and up to 23V, as long as an additional
supply voltage between 2.4V and 5.5V is available for the VIN pin.
Please refer to Figure 26 for a typical application schematic
adopting this solution.
FN7839.4
December 20, 2012
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97693IRTZ-T | 功能描述:IC LED DRVR BACKLIGHT 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 |
| ISL97693IRTZ-TK | 功能描述:IC LED DRVR BACKLIGHT 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 |
| ISL97694AIRTZ | 制造商:Intersil Corporation 功能描述:6 CH W/12-BIT PWM DIMMING SINGLE CELL LI-ION BATTERY POWERED - Rail/Tube 制造商:Intersil Corporation 功能描述:IC LED DRVR BACKLIGHT 20TQFN |
| ISL97694AIRTZ-T | 制造商:Intersil Corporation 功能描述:6 CH W/12-BIT PWM DIMMING SINGLE CELL LI-ION BATTERY POWERED - Tape and Reel 制造商:Intersil Corporation 功能描述:IC LED DRVR BACKLIGHT 20TQFN |
| ISL97694AIRTZ-TK | 功能描述:LED照明驱动器 6CH w/12Bit Dimming Li-Ion 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 |
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