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參數資料
| 型號： | NCP5604B |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Efficiency White LED Driver(高效白色LED驅動器) |
| 中文描述： | 高效率白光LED驅動器（高效白色發(fā)光二極管驅動器） |
| 文件頁數： | 11/15頁 |
| 文件大?。?/td> | 359K |
| 代理商： | NCP5604B |
NCP5604A, NCP5604B
http://onsemi.com
11
and 23 mA when Q1 is ON. The concept can use either a
DC drive or a pulsed mode to dynamically dim the light out
of the LED.
A different analog approach, but more complex solution,
can be derived from either a DC or a pulsed voltage
associated with a current mirror built with low cost discrete
devices (see Figure 14). The associated filter (R2/R3/C1)
provides a continuous voltage to the current mirror, thus a
digitally controlled continuous output current. Generally
speaking, the PWM frequency could be either in the low
end 20 Hz to 200 Hz band, or above the audio band (25 kHz
and beyond) to make sure the dimming can be adjusted
from zero to 100% without any audible noise. As a matter
of fact, the NCP5604A has been designed to guarantee
200 kHz PWM at the ENABLE pin.
The current mirror can be largely improved by using an
external operational amplifier to get a very stable and
temperature independent current, but such a solution could
turn out to be too expensive and, generally speaking, the
basic structure given, Figure 13, gives good results since
the current depends mostly upon the quality of resistor R2.
Figure 13. Basic Analog Dimming Control
VBAT
C2P
C
C
L
L
L
L
1
2
3
4
9
GND
EN
IREF
AGND
PGND
C2N
C3P
C3N
VOUT
5
6
7
8
ENABLE
1
R
6
R
Q1
High Out
Figure 14. Basic Analog PWM Dimming Control
VBAT
C2P
C
C
L
L
L
L
1
2
3
4
9
GND
EN
IREF
AGND
PGND
C2N
C3P
C3N
VOUT
5
6
7
8
ENABLE
GND
Q
Q
BC846BDW
15 k
R2
GND
1
C
12 k
R1
PWM
V = 3.3 V
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