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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 / 11 page  3 Oct 23-06 SP7615 Four Channel Constant Current LED Driver © Copyright 2006 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. THEORY OF OPERATION Figure 1: SP7615 Block Diagram VCC GND EN ISET LED1 LED2 LED3 LED4 Bias Driver Thermal Shutdown V to I Converter Enable The device has an enable function that is designed for TTL level inputs. This input will also track the V CCpin so levels up to VCCare 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. The EN pin is internally pulled down with an approximately 80kOhm resistor. The SP7615 will remain in shutdown mode if this pin is left open. |
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