• The OSC port has an input impedance of 50ohm.
• The maximum input signal allowed is +26dBm, and the voltage of 4.46Vrms (12.6Vpk-pk).
• There is an OSC to Vcomp port signal attenuation ratio of 20dB.
• The Vref port is a differential input with a common mode input impedance of 10 kohm. The maximum input voltage is +/- 10V.
• The Vin port is a differential input with a common mode input impedance of 100 kohm. The maximum input voltage is +/- 60V.
• The OSC port is a single-ended input with an input impedance of 50 ohm. The maximum input power is +26dBm, and there is a 20dB attenuation from OSC to Vcomp. The bandwidth is greater than 1MHz.
• Four (4) LTO (lithium titanate) batteries are connected in series to power the J2103A. They can be fully charged in about 30 minutes and can work continuously for more than 8 hours with Vcomp=10V at no-load and the OSC port not connected. Since there are LTO batteries in the J2103A, please adhere to the temperature storage, transportation, and operating specifications discussed in the online documents, “Shipping Regulations for Lithium Batteries” and “Battery Charging Info: Banana to USB Connector.” The lithium titanate battery can be recharged more than 8000 times. The input power is greater than 10W when charging, so a 15W USB charger (supplied) must be used. The USB to banana adapter PWR-OPT03 provides 15W, 5V, 0.5A~3A charging capability.
• At a frequency of 10Hz, the gain is approximately -48dB and the phase shift is 90 degrees.

Figures 1 and 2 show the results of verifying the frequency response of Vin to Vcomp (left) and OSC to Vcomp (right) using an E5061B network analyzer.

Model	Description	Price
J2103A	Power Stage Isolator – Loop Breaker	$895.00 Add to Cart
DB102A	Power Stage Isolator EVA Board – Converter Demo Board	$90.00 Add to Cart
PWR-OPT03	Banana to USB adapter	$90.00 Add to Cart

The J2103A Power Stage Isolator is a general device that replaces feedback control circuits to control the power output circuit (Power stage), also, known as the power stage plant. The power supply plant gain represents the amplification factor of the power supply unit within this feedback control loop. With the J2103A, you can measure the frequency response of the power output circuit (Power stage) before designing the feedback control circuit and design the feedback control circuit according to the actual measurement results. The whole design process can almost be completed at one time, with the integration of the power output circuit (Power stage) and the feedback control circuit relatively accurate the design cycle can be greatly shortened.

The J2103A can be used with almost any power circuit that requires feedback control. Its feedback input (Vin) and reference voltage (Vref) use differential inputs without reference ground problems. Therefore, designs with isolated or non-isolated power sources, switching or linear power supplies, and positive or negative voltage feedback can all use the J2103A.

The plug-and-play J2103A simplifies accurate open-loop and control loop gain parameter measurement quickly and easily while using the Picotest P9611A/P9610A power supply with an FRA, such as the OMICRON Lab Bode 100 VNA. This is a powerful tool for power supply designers to be able to quickly access hidden or difficult to bound parameters for their power supply design or to support accurate parameter testing for state-space average VRM model development.

The DB102A is a useful demo board that is available to support training and setup experimentation for the J2103A.