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参数资料
| 型号： | ISL97631IHTZ-T7 |
| 厂商： | Intersil |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT TSOT-6 |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 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： | 800kHz ~ 1.8MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 27V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1244 (CN2011-ZH PDF) |
| 其它名称： | ISL97631IHTZ-T7DKR |
ISL97631
Block Diagram
Vin
1.2MHz
1.35MHz Oscillator and Ramp
Generator
Enable
ISL97631
LX
Vout
PWM
Comparator
PWM Logic
Controller
FET
Driver
Current
Sense
-
GND
GM Amp
Compensation
GM
Amplifier
95mV
Bandgap
Reference
FB
Generator
FIGURE 7. ISL97631 BLOCK DIAGRAM
Pin Descriptions
PIN PIN
NUMBER NAME DESCRIPTION
1 VOUT Output Pin. Connect to the anode of the top
current, the converter operates in either continuous
conduction mode or discontinuous conduction mode. Both
are normal. The forward current of the LED is set using the
R SET resistor. In steady state mode, this current is given by
the equation:
I LED = ---------------
2
3
GND
LX
LED and the output filter capacitor .
Ground Pin. Connect to local ground.
Switching Pin. Connect to inductor.
V FB
R SET
(EQ. 1)
4
ENAB Enable Pin. Connect to enable signal to turn-on
or off the device.
Shut-Down
When taken low the ENAB pin places the ISL97631 into
5
6
FB
VIN
Feedback Pin. Connect to the cathode of
bottom LED and the sense resistor.
Input Supply Pin. Connect to the input supply
voltage, the inductor and the input supply
power down mode. When in power down, the supply current
is reduced to less than 1μA.
Dimming Control
decoupling capacitor.
Detailed Description
The ISL97631 uses a constant frequency, current mode
control scheme to provide excellent line and load
regulation. It can drive up to 6 LEDs in series or 15 LEDs in
parallel/series configuration, with efficiencies of up 85%.
The ISL97631 operates from an input voltage of 2.7V to
5.5V and can boost up to 27V.
Steady-State Operation
PWM DIMMING
The ENAB pin also doubles as a brightness control. There
are two different possible dimming control methods. The
first dimming method is controlled through the duty-cycle of
the ENAB input PWM waveform, which can operate at
frequencies up to 1kHz. For frequencies greater than 1kHz,
see Analog Dimming. The LEDs operate at either zero or
full current. This is the PWM dimming control method. The
relationship between the average LED current and the
duty-cycle (D) of the ENAB pin’s waveform is as follows:
average I LED = --------------- ? D
The ISL97631 operates with constant frequency PWM. The
switching frequency is around 1.35MHz. Depending on the
input voltage, inductance, number of LEDs and the LED
4
V FB
R SET
(EQ. 2)
FN7370.1
December 21, 2005
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL97631IHTZ-T7A | 功能描述:LED显示驱动器 ISL97631IHTZ HI PWR WHT LED BOOSTLT1933 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| ISL97632IRT14Z | 制造商:Intersil 功能描述:LED Driver with 1-Wire Dimming(3 LED) |
| ISL97632IRT14Z-T | 功能描述:IC LED DRIVR WHITE BCKLGT 8-TDFN 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 |
| ISL97632IRT14Z-TK | 功能描述:IC LED DRIVR WHITE BCKLGT 8-TDFN 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 |
| ISL97632IRT18Z | 制造商:Intersil 功能描述:LED Driver with 1-Wire Dimming(4 LED) |
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