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參數(shù)資料
| 型號： | AIC1648CGBG |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | Built-in OVP White LED Step-Up Converter |
| 中文描述： | 內(nèi)置過壓保護白光LED轉(zhuǎn)換器升壓型 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 275K |
| 代理商： | AIC1648CGBG |
AIC1648
Dimming Control
There are three different ways of dimming control
circuits as follows:
1.
PWM brightness control provides the widest
dimming range by pulsing the LEDs on and off at
full and zero current, respectively. The change of
average LED current depends on the duty cycle of
the PWM signal. Typically, a 0.1kHz to 1kHz
PWM signal is used. Two applications of PWM
dimming with AIC1648 are shown in Figure 16
and Figure 17. One, as Figure 16, uses PWM
signal to drive
SHDN
pin directly for dimming
control. The other, as Figure 17, employs PWM
signal going through a resistor to drive FB pin. If
the
SHDN
pin is used, the increase of duty cycle
results in LED brightness enhancement. If the FB
pin is used, on the contrary, the increase of duty
Using a PWM signal
cycle will decrease its brightness. In this
application, LEDs are dimmed by FB pin and
turned off completely by
SHDN
.
2.
For some applications, the preferred method of a
dimming control uses a variable DC voltage to
adjust LED current. The dimming control using a
DC voltage is shown in Figure 18. With a VDC
ranging from 0V to 5V, the selection of resistors in
Figure 18 results in dimming control of LED
current from 20mA to 0mA, respectively.
Using a DC Voltage
3.
Filtered PWM signal can be considered as an
adjustable DC voltage. It can be used to replace
the variable DC voltage source in dimming
control. The circuit is shown in Figure 19.
Using a Filtered PWM Signal
L
10
μ
H
D1
RB521S-30
SW
VIN
OVP
SHDN
FB
GND
AIC1648
VIN
R
FB
4.7
C1
1
μ
F
C2
1
μ
F
PWM
Fig. 16 Dimming Control with a PWM Signal
L
10
μ
H
D1
RB521S-30
SW
VIN
OVP
SHDN
FB
GND
AIC1648
V
IN
R
FB
4.7
C1
1
μ
F
C2
1
μ
F
PWM
R2
51K
R1
1K
Fig. 17 Dimming Control Using a PWM Signal
8
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| AIC1648CGTR | Built-in OVP White LED Step-Up Converter |
| AIC1648PGBG | Built-in OVP White LED Step-Up Converter |
| AIC1648PGTR | Built-in OVP White LED Step-Up Converter |
| AIC1648XXXX | Built-in OVP White LED Step-Up Converter |
| AIC1650CS | 3-Cell, High-Efficiency, Inverting DC/DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AIC1648CGTR | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1648PGBG | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1648PGTR | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1648XXXX | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:Built-in OVP White LED Step-Up Converter |
| AIC1650 | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:3-Cell, High-Efficiency, Inverting DC/DC Converter |
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