Si8920BD-IS, Strømshunt-monitor, enkelt Differentiel, 16 ben, SOIC

The Si8920 is a galvanically isolated analogue amplifier. Their low voltage and differential input is ideal for measuring voltage across a current shunt resistor or for any place where a sensor must be isolated from the control system.

Output is a differential analogue signal amplified by either 8.1x or 16.2x. The very low signal delay allows control systems to respond quickly to fault conditions or changes in load. Low offset and gain drift ensure that accuracy is maintained over the entire operating temperature range.

High common mode transient immunity means that the Si8920 will deliver accurate measurements even in the presence of high power switching like would be found in a motor drive system or inverter.

To help evaluate the Si8920 there is a dedicated development kit available - SI8920ISO-KIT (RS 9026806). It is populated with the Si8920BC-IP and enables quick connection to a shunt resistor.

Si8920 tilbydes i 4 varianter:
Si8920AC-IP (RS 901-3967) med en indgangsspænding på ±100 mV i et gull wing DIP-8 hus
Si8920BC-IP (RS 901-3976) med en indgangsspænding på ±200 mV i et gull wing DIP-8 hus
Si8920AD-IS (RS 901-3979) med en indgangsspænding på ±100 mV i et SOIC-16 hus
Si8920BD-IS (RS 901-3973) med en indgangsspænding på ±200 mV i et SOIC-16 hus

Strømfølingsforstærkere har en spændingskapacitet, der er proportional med spændingsfaldet på tværs af en lavværdimodstand, normalt i en strømskinne med høj strømstyrke. Dermed måler de strømgennemløbet i den pågældende strømskinne.