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| 型号： | ISL97801ARZ-T |
| 厂商： | Intersil |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER AUTOMOTIVE 20-QFN |
| 标准包装： | 6,000 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 频率： | 850kHz ~ 1.15MHz |
| 电源电压： | 2.7 V ~ 16 V |
| 输出电压： | 32V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 105°C |
ISL97801
further improve the linearity of PWM dimming, an internal
timer delays system shutdown via EN/PWM for 50ms.
FIGURE 31. OPERATION WITH ENL CONTROLLED FET
FIGURE 32. OPERATION WITH NO ENL CONTROLLED FET
Bias Current Dimming
Current in the LED load is determined by the value of the
feedback resistor and the target feedback regulation voltage:
The value of V FB should be limited to between 50mV and
450mV for linear operation. For minimum light output, V FB
may be set below 50mV. With MODE tied to GND, voltage
across the feedback resistor is set at ~400mV via an internal
reference. In either operating mode, if LED temperature
control is enabled the value of VFB will be reduced when
maximum LED temperature is exceeded.
Input Overvoltage
For automotive applications, an external high voltage NFET
driven by the FAULT pin disconnects the device from the
input supply in response to voltage spikes on the input
supply. During start-up an internal charge pump drives the
FAULT pin above the input voltage, ensuring the NFET is
fully enhanced and powering up the device. In normal
operation the switching node of the boost regulator or the
floating supply of the buck regulator is used to pump FAULT
above VIN. On detection of an overvoltage, the FAULT pin is
discharged to GND. The gate to source voltage of the
NDMOS is internally limited to ±15V to prevent voltage
stress.
Fault Protection
The external NFET is also used as a fault protection switch,
disconnecting the input supply if a fault occurs for more than
50ms. The system monitors feedback voltage regulation,
output overvoltage and input overvoltage. For applications
not requiring input voltage or fault protection, connect VBAT
and VIN directly together. All faults except input supply
overvoltage latch the ISL97801 into an off state that can be
cleared by either power cycling the input supply or the
EN/PWM pin. Connecting the TMAX pin to VDC disables the
fault latch function (LED over temperature control is also
disabled).
Output Overvoltage Protection (OVP)
If the FB pin is shorted to ground or an LED fails open
circuit, output voltage in BOOST mode can increase to
potentially damaging voltages. An optional overvoltage
protection circuit can be enabled by connection of the OVP
pin to the output voltage. The device will stop switching if the
output voltage exceeds OVPH and re-start when the output
voltage falls below OVPL. During sustained OVP fault
I LED = -----------------------
V FB
R SENSE
(EQ. 1)
conditions, V OUT will saw-tooth between the upper and
lower threshold voltages at a frequency determined by the
magnitude of current available to discharge the output
With MODE tied to VDC, voltage across the feedback
resistor is set by V LEVEL :
capacitor and the value of output capacitor used.
The OVP threshold can be set to a lower value by using an
V FB = ----------------------
V LEVEL
5
12
(EQ. 2)
external zener diode and resistor, as shown in Figure 33. R1
should be adjusted to minimize offset in the FB voltage due
to FB pin input current. A value of 100 Ω is recommended.
FN6428.1
April 2, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97801ARZ-TK | 功能描述:IC LED DRIVER AUTOMOTIVE 20-QFN 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 |
| ISL97801BOOSTEVALZ | 功能描述:EVAL BOARD FOR ISL97801 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 |
| ISL97900CRZ | 功能描述:LED照明驱动器 High Current RGB Driver/Controller, 28L 4x5 QFN, Commercial 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 |
| ISL97900CRZ-T | 功能描述:LED照明驱动器 High Current RGB Driver/Controller, 28L 4x5 QFN, Commercial 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 |
| ISL97900CRZ-T7A | 功能描述:LED照明驱动器 High Current RGB Driver/Controller, 28L 4x5 QFN,Commercial T 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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