- 您现在的位置：买卖IC网 > Sheet目录310 > AP8802SPG-13 (Diodes Inc)IC LED DRIVER HIGH BRIGHT 8SOIC
AP8802
1A LED STEP-DOWN CONVERTER
Application Information (cont.)
LED Current Adjustment/Dimming
The LED current for the AP8802 can be adjusted by driving the CTRL with a digital signal (PWM dimming) or by driving the CTRL with a DC
voltage between 0.3V and 2.5V (dc dimming).
If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:
× THD
I LED =
V CTRL
V REF
V
R SET
where V REF is nominally 1.25V
1200
LED Current @
0.39
V CTRL = 1.25V
1000
0.2
0.47
LED Current @
V CTRL = 2.5V
LED Current @
800
0.56
V CTRL = 0.625V
600
0.2
0.33
0.39
0.47
0.68
0.82
1
400
0.56
1.2
200
0.33
0.47
0.68
0.82
0.68
0.82
1
1
1.2
1.2
1.5
1.5
1.5
2
2
2
3
3
0
3
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3.0
R SET VALUE ( Ω )
Figure. 19 LED Current Setting vs. R SET and V CTRL
Figure 19 shows that reducing the CTRL voltage by a factor of 2 also reduces the LED current by a factor of 2. The AP8802 has the ability
vary the LED current by a factor of 2 above the default value set by R SET down to a factor of 0.24 of the nominal LED current. This provides
an 8.33:1 dynamic range of the dc dimming.
A low pass filter on the CTRL pin of the AP8802 automatically provides some soft-start function of the LED current on initial start-up (this
phenomenon can be seen in figure 7); the built in soft-start period can be increased by the addition of an external capacitor onto the CTRL
pin.
The AP8802’s dimming range can be increased above this DC dimming factor by applying a PWM signal to the CTRL pin using this method
dimming dynamic ranges above 100 can be achieved.
AP8802
Document number: DS31766 Rev. 9 - 2
10 of 19
www.diodes.com
May 2012
? Diodes Incorporated
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
AP8803WTG-7
IC LED DRIVER CONN CURR TSOT23-5
APEK4402KLP-01-T-DK
BOARD EVAL FOR A4402
APP-001-15AMP
PLUG AUTO PWR BLACK W/LED 15AMP
APP-001-20AMP
AUTO PLUG 12VOLT WITH 20AMP FUSE
APP-001-VO
PLUG AUTO PWR BLACK W/LED IND
APP-001
PLUG AUTO PWR BLACK W/LED IND
APP-002
PLUG AUTO PWR GRAY W/LED IND
APP-003
PLUG AUTO PWR BLACK W/O LED IND
相关代理商/技术参数
AP8803
制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:Cost effective 3W LED driver for consumer applications
AP8803EV1
功能描述:AP8803 1, Non-Isolated Output LED Driver Evaluation Board 制造商:diodes incorporated 系列:- 零件状态:有效 电流 - 输出/通道:680mA 输出和类型:1，非隔离 电压 - 输出:- 特性:可调光 电压 - 输入:8 V ~ 30 V 所含物品:板 使用的 IC/零件:AP8803 标准包装:1
AP8803WTG-7
功能描述:LED照明驱动器 BUCK LED DRIVER 30V 3W RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
AP8821
制造商:APLUS 制造商全称:APLUS 功能描述:21 sec VOICE OTP
AP8841
制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:RACK PDU 2G, METERED, ZEROU, 30A, 200/208V, (36) C13 & (6) C19 制造商:Schneider Electric 功能描述:RACK PDU 2G, METERED, ZEROU, 30A 200/208V, (36) C13 & (6) C1 - Bulk
AP8842
制造商:APLUS 制造商全称:APLUS 功能描述:42 sec VOICE OTP
AP8853
制造商:Schneider Electric 功能描述:RACK PDU 2G, METERED, ZEROU, 32A, 230V, (36) C13 & (6) C19 - Bulk
AP8853-25PI
制造商:ANSC 功能描述:AP8853-25PI 300MA 2.5V LDO LINEAR REGULATOR /OGI
