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Four Channel Constant Current LED Driver
EC4101
BLOCK DIAGRAM
THEORY OF OPERATION
Introduction
The EC4101 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 EC4101 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 VCC
pin so levels up to VCC are 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 EC4101 responds in less than 10
us to PWM signals applied
to this pin.
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DR18EC070105-VER1.0
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