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Everything about TTL and laser control

TTL / PWM – how does it work

Everything about TTL and laser control

Quite often we get questions about TTL.
How do TTL works, how should it be connected, what voltage needed to control TTL, what to do if you want to control the laser intensity but you do not have a PWM on your board, etc?

Here we are going to highlight the key things.

1. Endurance lasers support TTL+ with the voltage control in the range of 0 – 12V. It means that any voltage in this range will activate the MOSFET and the laser will work. The voltage value does not affect the laser power – it only affects the duration of the signal. For example, TTL will activate the laser at any voltage in this range, at any duty ratio, without changing the laser power.

2. If you do not have a PWM on your board and you want to control the laser – some boards can have different voltage on a power output, for example your power output can be 0-12V with 5A current, in this case just connect the TTL wire to the 12V+ and use your existing power output to control the laser. For example, the output of 2V and 5A will activate 10% of the max laser power, while the output of 12V and 5A will activate 100% of the laser power. This method of laser control is supported on such 3D printers as Anet A8.

3. The TTL should be connected to your PWM output or the 12V+ power input. It means that it will be either controlled by the PWM signal or run full power when there is power (voltage) on the power pin slot.

4. If you do not have a PWM output but your board is compatible with an Arduino Nano then you may use the D11 output pin as a PWM to control the TTL.

5. On most CNC machines a spindle output or spindle speed output can be used to control the laser power by way of changing the impulse duration or by changing the voltage on the output slot.
Endurance lasers are tuned individually and the true power consumption can vary from 12V 2Amps up to 7-8Amps.
Thus, a 10 watt laser is tuned for 5.1V and 5-5.5amps – goes directly to the diode.
DC/DC while decreasing and stabilizing the current and the voltage requires good power adapters.

In continuous mode, there is the maximum frequency and you can toggle on and off the driver. The laser diode can be modulated at very high speeds. The MOSFETs and their driver must have an upper-frequency limit.

Right now we plan to use 6kHz frequency.

Everything you need to know about TTL signal

Measuring voltage on a PWM output

Live demo showing a drawing of a signal on an oscillograph.

Changing laser power via TTL

10 watt+ laser with an Endurance laser box

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Everything about TTL and laser control
Everything about TTL and laser control

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TTL mode

Can be turned on and off with 3.5-24V.
Variable power output.

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Compatible with most 3D printers and CNC machines.

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