Input 7~18V Output 5V/1A Step-Down Converter-LM2675 STEP DOWN CONVERTER

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

Photocoupler

The drawing is a step-down voltage converter constructed using an integrated circuit LM2675-5.0. The input voltage of this circuit is 7v ~ 18V. The output voltage is 5V / 1A. The LM2675-5.0 integrates switching devices and control circuits, as well as overcurrent protection and sense output voltage resistance. A fixed voltage output of 5V is obtained by simply connecting a small number of components. In addition, NS also produces products with output voltages fixed at 12V, 3.3V, and products with adjustable output voltages without integrated resistors. The oscillation frequency is fixed at 260 kHz. Since the switching frequency is high, the value of the external inductance is small. The value of the inductance can be calculated by the following equation: L = Vout (Vin - Vout) / ΔIl × Vin × f. In the formula, Il is the ripple current of the inductor. It can be set to 10% to 30% of the output current. f is the oscillation frequency (260 kHz at this time).