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| 型号： | EL7630ICZ-T7A |
| 厂商： | Intersil |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SC-70-6 |
| 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： | 6-TSSOP，SC-88，SOT-363 |
| 供应商设备封装： | SC-70-6 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1242 (CN2011-ZH PDF) |
| 其它名称： | EL7630ICZ-T7ADKR |
EL7630
Detailed Description
EL7630 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 86%.
25
20
EL7630 operates from an input voltage of 2.7V to 5.5V and
can boost up to 27V.
Steady-State Operation
EL7630 operates with constant frequency PWM. The
switching frequency is around 1.2MHz. 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
15
10
5
0
1kHz
400Hz
0 10 20 30 40 50 60 70 80 90 10
DUTY-CYCLE (%)
R SET resistor. In steady state mode, this current is given by
the equation:
FIGURE 8. PWM DIMMING LINEAR RANGE (FOR 400Hz AND
1kHz PWM FREQUENCIES CONDITION,
I LED = ---------------
V FB
R SET
(EQ. 1)
C OUT = 0.22μF)
The second dimming control is to apply a variable DC
voltage to adjust the LED current. This is called analog
Shut-Down
The ENAB pin, when taken low places EL7630 into power
down mode. When in power down, the supply current
reduced to less than 1μA.
Dimming Control
The ENAB pin also doubles as a brightness control. There
are two different types of dimming control methods. The first
dimming control is controlled through the duty-cycle of the
ENAB input PWM waveform, which can operate at
frequencies of 400Hz to 1kHz. The LEDs operate at either
zero or full current. This is called PWM dimming control
method. The relationship between the average LED current
dimming control. The dimming control using a DC voltage is
shown in Figure 9. As the DC dimming signal voltage
increases, the voltages drop on R 1 and R 2 increases and
the voltage drop on R SET decreases. Thus, the LED current
decreases. The DC dimming signal voltage can be a variable
DC voltage or a DC voltage generated from a PWM control
signal. For some application areas, the PWM control signal
is a high frequency signal. To make dimming controllable
with these high frequency PWM signals, the high frequency
components of the PWM control signal should be filtered to
get the equivalent DC voltage. The equivalent DC voltage is
then used as the variable DC voltage for dimming LED
current.
average I LED = --------------- ? D
R SET
I LED = --------------- ? -------------------- 2 - – --------------------------- 1
R 2 ? ?
V Dim = ------- ? V FB ? ? 1 + ------ 1 - – F ?
and the duty-cycle (D) of the ENAB pin’s waveform is as
follows:
V FB
(EQ. 2)
The magnitude of the PWM signal should be higher than the
minimum ENAB voltage high. The bench PWM dimming test
R 1 ? R 2 ?
R
V FB R 1 + R V Dim ? R
R SET R 2 R SET ? R 2
(EQ. 3)
(EQ. 4)
results are shown in Figure 8. In the test, two PWM
frequencies 400Hz and 1kHz are chosen to compare the
linear dimming range. It is clear that for lower PWM
frequency, the linear dimming range is wider than one for
higher PWM frequency. In the PWM dimming test, the output
capacitor is 0.22μF.
5
where F is the brightness with respect to the undimmed
value.
FN7371.1
February 22, 2006
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| EL7630IWTZ | 制造商:Intersil Corporation 功能描述:LED DRVR 6SEGMENT 2.7V TO 5.5V 5PIN TSOT - Bulk |
| EL7630IWTZ-EVAL | 功能描述:LED 照明开发工具 EL7630IWTZ-EVAL DEMO BRD RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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| EL7630IWTZ-T7A | 功能描述:LED显示驱动器 EL7630IWTZ WHT LED BOOSTG 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 |
| EL7640 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:TFT-LCD DC/DC with Integrated Amplifiers |
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