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| 型号： | AP8802SPG-13 |
| 厂商： | Diodes Inc |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT 8SOIC |
| 特色产品： | LED Driver Solutions AP880X Series Step-Down DC/DC Converter |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 500kHz |
| 电源电压： | 8 V ~ 48 V |
| 输出电压： | 48V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOP-EP |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 105°C |
| 产品目录页面： | 1138 (CN2011-ZH PDF) |
| 其它名称： | AP8802SPGDIDKR |
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
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