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SP7615 Datasheet(PDF) 3 Page - Sipex Corporation |
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SP7615 Datasheet(HTML) 3 Page - Sipex Corporation |
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3 / 10 page  3 Date: 08/31/05 SP7615 Four Channel Constant Current LED Driver © Copyright 2005 Sipex Corporation BLOCK DIAGRAM Introduction The SP7615 is a four channel constant current source LED driver with programmable output current level. The design consists of a regulator bandgap, voltage to current converter, and output mirror drivers. The bandgap ensures good performance over voltage and temperature. The four outputs are tightly coupled allowing for excellent channel matching. Thermal Shutdown The SP7615 uses a thermal comparator to monitor the system temperature shutting the device down if the internal temperature reaches 150ºC. The device will remain off until the internal temperature drops below 130ºC. Enable The device has an enable function that is designed for TTL level inputs. This input will also track the V CC pin so levels up to VCC are THEORY OF OPERATION Figure 1. SP7615 Block Diagram VCC GND EN ISET LED1 LED2 LED3 LED4 Bias Driver Thermal Shutdown V to I Converter acceptable. The enable pin can also be used to control the LED brightness with a pulse width modulated control signal. Duty Cycle or PWM control of the LED current maintains constant LED color while brightness is changing. The SP7615 responds in less than 10µs to PWM signals applied to this pin. I SET Pin The I SET pin is the servo point of an amplifier configured as a voltage to current converter. The voltage at this pin trips servos to the internal bandgap potential. A set resistor can be connected from the I SET pin to ground to generate a reference current for the following current gain stages. A current could alternately be applied to this pin in the form of a current source or current output DAC. This pin can also have a PWM signal applied to control the LED brightness. |
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