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SP7686 数据表(PDF) 3 Page - Sipex Corporation |
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SP7686 数据表(HTML) 3 Page - Sipex Corporation |
3 / 16 page Jul16-07 RevP SP7686: 500mA LED Driver 2007 Sipex Corporation - 3 - PIN DESCRIPTION PIN # PIN NAME SP7686 PIN DESCRIPTION 1 VIN Power supply input. Place a 10µF decoupling capacitor next to this pin. 2, 3 C1, C2 Connect an external 0.22µF flying capacitor between these pins 4 CTRL 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 200µs 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 200µs 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. 5 FB 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). 6 SGND Ground pin for SP7686 bias and reference (low current). 7 PGND Ground pin for power (high current). 8 VOUT 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 2.2µF ceramic capacitor next to this pin. PIN # PIN NAME SP7686A PIN DESCRIPTION 1 VIN Power supply input. Place a 10µF decoupling capacitor next to this pin. 2, 3 C1, C2 Connect an external 0.22µF flying capacitor between these pins 4 FLASH The fixed current driver (SP7686A) uses the flash pin to switch between two internally preset voltage levels, for Flash and Torch mode. The part is enabled and disabled by the separate ENABLE pin. The part has a 3.5s maximum on time in Flash mode. After a 3.5s timeout occurs the part shuts down and can be enabled by the FLASH or ENABLE pins. This pin cannot be left open. 5 FB 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). 6 EN The fixed current driver (SP7686A) has this enable/shutdown pin. (Logic high = enable, logic low = shutdown). Used to immediately disable the driver and PWM brightness control. There is an internal pull down on this pin. 7 PGND Ground pin for power (high current). 8 VOUT 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 2.2µF ceramic capacitor next to this pin. |
类似零件编号 - SP7686 |
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类似说明 - SP7686 |
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