Connect with Positive terminal of power supply Pins Functions Pin number one and four is not connected to any point physically. Therefore they are not in use. Pin number 8 is used to provide power supply to TLP and pin number 5 is a ground pin that provides a return path to power supply ground. A maximum power supply voltage between volt dc can be given to TLP But it also depends on the temperature of the environment where it is being used.
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It is clearly shown in figure that led at input stage and photo detector diode at output stage is used to provide isolation between input and ouput. Pin number 1 and 4 are not connected to any point. Hence they are not in use. Pin 2 is anode point of input stage light emitting diode and pin 3 is cathode point of input stage. Input is provided to pin number 2 and 3. Pin number 8 is for supply connection. Pin number 5 is for ground of power supply. Therefore they are not in use.
Pin number 8 is use to provide power supply to TLP and pin number 5 is ground pin which provides return path to power supply ground. Maximum power supply voltage between volt dc can be given to TLP But it also depends on temperature of environment in which you are using TLP Pin number 2 and 3 are anode and cathode points of input stage LED.
It works like a normal light emitting diode. It has similar characteristics of forward voltage and input current. Maximum input current is in the range of mA and forward voltage drop is about 0.
TLP provides output from low to high with minimum threshold current of 1. Pin number six and seven is internally connected to each other. Ouput can be taken from either pin number 6 and 7. Totem pole configuration of two transistor is used in TLP In case of high input , output becomes high with output voltage equal to supply voltage and in case of low input, output become low with output voltage level equal to ground.
Mosfet driver TLP can be used up to 25khz frequency due to slow propagation delay. This all about pin configuration and working of TLP Now i will talk about how to used isolated mosfet driver tlp as low side MOSFET driver and high side mosfet driver. In this circuit diagram, tlp is used as non inverting low side mosfet driver. It provide protection to tlp by providing stabilize voltage to IC.
As shown in figure above input is drive signal that drives the output. Vin is according to signal ground. It should not be connected with supply ground and output ground. It is clearly shown in above figure TLP and load ground is referenced to the power ground and it is isolated from input signal reference ground. Value of supply voltage ranges between volt. Usually input signal is provided through microcontroller and microcontroller input signal level is in the order of 5 volt.
Capacitor C1 is used as decoupling capacitor. It is used as non inverting high side mosfet driver. Therefore it is used as a non inverting high side mosfet driver. In high side configuration there are three grounds as shown in figure above.
Ground of input signal, ground of supply voltage and ground of power supply voltage.
How to use isolated MOSFET driver TLP250
The TLP, like any driver, has an input stage, an output stage and a power supply connection. Pins 1 and 4 are not internally connected to anything, and hence are labeled N. Pin 8 is VCC — the positive supply. Pin 5 is GND — the ground supply or the return path for the driving power supply. The supply voltage must be at least 10V. The maximum voltage is dependent on the operating temperature.
TLP250 MOSFET IGBT DRIVER