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參數(shù)資料
| 型號(hào)： | ISL97631 |
| 廠商： | Intersil Corporation |
| 英文描述： | White LED Boost Regulator With Integrated Schottky Diode |
| 中文描述： | 白光LED升壓調(diào)節(jié)器集成了肖特基二極管 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 332K |
| 代理商： | ISL97631 |
4
FN7370.1
December 21, 2005
Block Diagram
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
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
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:
Shut-Down
When taken low the ENAB pin places the ISL97631 into
power down mode. When in power down, the supply current
is reduced to less than 1μA.
Dimming Control
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:
FIGURE 7. ISL97631 BLOCK DIAGRAM
Driver
Controller
Sense
GM
Amplifier
Generator
Generator
95mV
Compensation
PWM
Comparator
Vin
Enable
LX
GND
FB
ISL97631
Vout
-
FET
PWM Logic
Current
1.35MHz
Bandgap
Reference
GM Amp
Pin Descriptions
PIN
NUMBER
PIN
NAME
DESCRIPTION
1
VOUT Output Pin. Connect to the anode of the top
LED and the output filter capacitor .
2
GND
Ground Pin. Connect to local ground.
3
LX
Switching Pin. Connect to inductor.
4
ENAB
Enable Pin. Connect to enable signal to turn-on
or off the device.
5
FB
Feedback Pin. Connect to the cathode of
bottom LED and the sense resistor.
6
VIN
Input Supply Pin. Connect to the input supply
voltage, the inductor and the input supply
decoupling capacitor.
I
LED
V
SET
--------------
=
(EQ. 1)
average I
LED
V
SET
--------------
D
=
(EQ. 2)
ISL97631
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL97631IHTZ-T7 | White LED Boost Regulator With Integrated Schottky Diode |
| ISL97631IHTZ-T7A | White LED Boost Regulator With Integrated Schottky Diode |
| ISL97632_07 | White LED Driver with Digital Dimming |
| ISL97632IRT14Z-T | White LED Driver with Digital Dimming |
| ISL97632IRT14Z-TK | White LED Driver with Digital Dimming |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97631HTZ-T7A | 制造商:Intersil Corporation 功能描述: |
| ISL97631IHTZ | 制造商:Intersil 功能描述:6 LEDs Driver with Integrated Schottky Diode with OVP |
| ISL97631IHTZ-T7 | 功能描述:IC LED DRIVR WHITE BCKLGT TSOT-6 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:60 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?線性（LDO），PWM，升壓（升壓） 輸出數(shù):8 內(nèi)部驅(qū)動(dòng)器:是 類型 - 主要:背光 類型 - 次要:RGB，白色 LED 頻率:500kHz ~ 1.5MHz 電源電壓:4.75 V ~ 26 V 輸出電壓:45V 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* 工作溫度:-40°C ~ 85°C |
| ISL97631IHTZ-T7A | 功能描述:LED顯示驅(qū)動(dòng)器 ISL97631IHTZ HI PWR WHT LED BOOSTLT1933 RoHS:否 制造商:Micrel 數(shù)位數(shù)量:5 片段數(shù)量: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PLCC-44 工作電源電壓:4.75 V to 11 V 最大電源電流:10 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Tube |
| ISL97632IRT14Z | 制造商:Intersil 功能描述:LED Driver with 1-Wire Dimming(3 LED) |
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