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SP6685ER Datasheet(PDF) 3 Page - Sipex Corporation |
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SP6685ER Datasheet(HTML) 3 Page - Sipex Corporation |
3 / 10 page 3 Date: 12/15/04 SP6685 Charge Pump LED Driver for Camera Flash © Copyright 2004 Sipex Corporation PIN DESCRIPTION PIN NUMBER PIN NAME DESCRIPTION 1VIN Input Voltage for the charge pump. Decouple with 1µF ceramic capacitor close to the pins of the IC. 2C1 Positive input for the external fly capacitor. Connect a ceramic 1µF capacitor close to the pins of the IC. 3C2 Negative input for the external fly capacitor. Connect a ceramic 1µF capacitor close to the pins of the IC. 4 FLASH Logic input to toggle operation between FLASH and TORCH mode. In TORCH mode FB is regulated to the internal 50mV reference. In FLASH mode FB reference voltage can be adjusted by changing the resistor from RSET pin to ground. Choose the external current sense resistor (RSENSE) based on desired current in TORCH mode. The FLASH mode should be limited to 200ms to avoid overheating the charge pump. 5EN Shutdown control input. Connect to VIN for normal operation, connect to ground for shutdown. 6RSET Connect a resistor from this pin to ground. When in FLASH mode (FLASH = High) this resistor sets the current regulation point according to the following: VFB = (1.26V/ RSET)*11.2KΩ. 7FB Feedback input for the current control loop. Connect directly to the current sense resistor. 8SGND Internal ground pin. Control circuitry returns current to this pin. 9PGND Power ground pin. Fly capacitor current returns through this pin. 10 VOUT Charge Pump Output Voltage. Decouple with an external capacitor. At least 1uF is recommended. Higher capacitor values reduce output ripple. |
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