Light Chain Pulse Driver

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The iC-NT device is an LED pulse driver for light barrier applications, especially light-grid circuitries.

The device, which is controlled by a shift register logic, features an adjustable LED current sink with a set range of 0.4..1A (at room temperature). For chain circuitries with several transmitters in operation, the internal set of three flipflops enables a secure beam and data shift control, free of race conditions.

The decrease in LED efficiency with a rise in temperature is almost compensated by a positive temperature coefficient of the current sink. In order to generate steep light pulses, the LED switch off is actively
supported by the discharge of its junction capacitance. The duration of this LED short-circuiting is controlled by a monoflop. In the event of a quick follow-up light pulse, a monoflop reset is performed
automatically to protect against cross currents.

The driver stage for the LED output prepares for a light pulse when DIN reads a high signal; synchronized with the CLK leading edge, the first flipflop transfers the DIN data to Q1 and powers up the LED sink.
Since the chain is loaded with just one single high bit and DIN is given by the output DOUT of the previous device, input DIN now reads low at the falling edge of CLK. The LED current sink stops the power, at the
same time as an internal data shift from Q1 to Q2 occurs. The LED pulse is well-defined by the time difference between two leading edges of the clock signal CLK. The second falling edge of CLK triggers the
third flipflop and activates the next device in the chain via DOUT if enabled by SHEN.

Since only one device is activated at a time, several iC-NT drivers may share one resistor, RSET, to define the LED current value.

The shift register is reset and the LED current sink is turned off in the event of excessive temperature or undervoltage. Protective diodes to prevent destruction through ESD are also included. The iC-NT device
fulfills safety requirements according to IEC 1496-1. An extended temperature range of -20°C..85°C is also available as an option.


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Adjustable LED pulse operation, set range of 0.4..1A
Controlled current slew rate enables short light pulses down to 1 s
LED efficiency degradation compensated by positive current temperature coefficient
Low standby current; circuit activation by input data
Low power requirement for external set resistor
Control logic with 3-step shift register
Compatible to CMOS levels
Data output buffer with built-in 120W wave impedance adaption
Single 5V supply
Thermal shutdown and power-down reset
ESD protection
Small outline package SO8
Suited for high-risk applications according to IEC 1496-1
Option: Extended temperature range of -20C..85C


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Light Chain Pulse Driver
Part #: iC-NT SO8
Light Chain Pulse Driver