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参数资料
| 型号： | SP7686ER-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR CONST CURRENT 8DFN |
| 标准包装： | 3,000 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 类型 - 主要： | 闪灯/白光，通用 |
| 类型 - 次要： | 高亮度 LED（HBLED），白色 LED |
| 频率： | 2MHz ~ 2.8MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
S P 7 6 8 6 / S P 7 6 8 6 A
C o n s t a n t C u r r e n t F l a s h D r i v e r i n D F N 2 m m x 3 m m
PIN ASSIGNMENT
?
SP7686 ???????????????????????????????????????????????????????????? SP7686A
Fig. 4: SP7686 and SP7686A Pin Assignment
PIN DESCRIPTION: SP7686
Name
1
2, 3
4
5
6
7
8
Pin Number
V IN
C1, C2
CTRL
FB
SGND
PGND
V OUT
Description
Power supply input. Place a 10 μ F decoupling capacitor next to this pin.
Connect an external 0.22 μ F flying capacitor between these pins
This pin is used to control LED current. Once enabled the adjustable driver counts
positive going edges at this pin and sequentially increases FB voltage with 10mV steps
to a maximum 31 steps or 360mV. When this pin is held LOW for longer than 200 μ s
the SP7686 enters shutdown. The part can be enabled using this pin. The first positive
edge resets the part. A second positive edge sets the part to VFB=0. A third positive
going edge will increase FB voltage to 60mV and subsequent positive edges increment
VFB in 10mV steps. The voltage level can increase only and must be reset to zero by
the 200 μ s shutdown timer in order to go to a lower current value. The part will be
limited to a 3.5s on time when FB voltage is set to 120mV and above. This pin cannot
be left open.
Current feedback input. Place an external current sense resistor from this pin to ground.
Voltage at this pin will be internally compared to the DAC output (60mV – 360mV).
Ground pin for SP7686 bias and reference (low current).
Ground pin for power (high current).
Output voltage of the internal charge pump. Connect the LED between this pin and the
current sense resistor. Voltage at this pin will be regulated in order to maintain constant
LED current. Place a 2.2 μ F ceramic capacitor next to this pin.
? 2010 Exar Corporation
4/16
Rev. 2.1.0
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