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| 型号： | CPC9909NETR |
| 厂商： | IXYS Integrated Circuits Division |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR HB OFF-LINE SOIC-8EP |
| 标准包装： | 2,000 |
| 恒定电流： | 是 |
| 拓扑： | 交直流离线开关，PWM |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB |
| 频率： | 30kHz ~ 120kHz |
| 电源电压： | 8 V ~ 550 V |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
| 工作温度： | -40°C ~ 85°C |
I NTEGRATED C IRCUITS D IVISION
2.10 Linear Dimming
A linear dimming function can be implemented by
applying a DC control voltage to the LD pin. By varying
this voltage from 0V to V CS(high) , the user can adjust
the current level in the LEDs which in turn will increase
or decrease the light intensity. The control voltage to
the LD pin can be generated from an external voltage
divider network from V DD . This function is useful if the
Figure 3 Typical Linear Dimming Application Circuit
F u se F2
2A
BR1
CPC9909
user requires LED current of a particular level, and
there is no exact R T value available. N ote that applying
a voltage higher than the current sense threshold
voltage to the LD pin will not change the output current
due to the fixed internal threshold setting. When the
LD pin is not used, it should be connected to V DD .
LD
Monitor
AC Inp u t
90 - 265 V rms
NTC1
AC
AC
-
+
D1
BY V 26B
C1
0.1 μ F
400 V
C1
22 μ F
400 V
R1
402k Ω
CPC9909
R2
51k Ω
HB LEDs
350mA
L1
4.7mH
IXTA 8 N50P
V IN
CS
GND
GATE
R T
LD
V DD
P W MD
RA1
5.0k Ω
C1
2.2 μ F
C1
0.1 μ F
2.11 PWM Dimming
R4
0.56 Ω
16 V
25 V
Pulse width modulation dimming can be implemented
by driving the PWMD pin with a low frequency square
wave signal in the range of a few hundred Hertz. The
PWMD signal controls the LED brightness by gating
the PWM gate driver output pin GATE. The signal can
be generated by a microcontroller or a pulse generator
with a duty cycle proportional to the amount of desired
light output.
Figure 4 Buck Driver for PWM Dimming Application Circuit
V IN
D1 Schottky
40 V
HB LEDs
900mA Max
12 - 30 V DC
10 μ F
50 V
220 μ H
CPC9909
402k Ω
ASMT-Mx00
V IN
CS
R T
LD
Q1
GND
GATE
V DD
P W MD
CPC1001N*
R1
0.27 Ω
0.1 μ F
50 V
P W M
*Optional Isolation
2.12 Combination Linear and PWM Dimming
A combination of linear and PWM dimming techniques
can be used to achieve a large dimming ratio.
R04
www.ixysic.com
9
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