DEMO MANUAL DC2423A LTM9100 Anyside High Voltage Isolated Switch Controller 2 with I C Command and Telemetry DESCRIPTION Demonstration circuit 2423A showcases the LTM 9100 easily exchanged or replaced due to screw terminal block Isolated Switch Controller in either a typical 48V applica- mounting. Protection is also included to protect the GATE tion (A) or in a high voltage 380V application (B). The and SENSE pins in the event of MOSFET destruction. The board may be configured for either high side or low side circuit can be operated manually or by computer control. operation, dependent on the connection of external sup- Design files for this circuit board are available at ply and load to the banana jacks. An on board capacitive DEMO MANUAL DC2423A OPERATING PRINCIPLES OVERVIEW An optional capacitive load with banana connections has been provided on the demo board. It may be used by The LTM9100 contains an isolated DC/DC converter, deliv- externally wiring to the proper load terminals. ering power to V at 10.4V and V at 5V from the input S CC2 supply, V . Isolation is maintained by the separation of Transient suppression is included to protect the MOSFET CC GND and V so that significant operating voltages and and on board load capacitor for the B version of the EE + transients can exist without affecting the operation of the demo board. The GATE pin and SENSE pins include LTM9100. The logic side ON pin enables or shuts down external overvoltage/overcurrent protection in the event the LTM9100. The isolated side GATE pin and MOSFET the MOSFET shorts either drain to gate or drain to source, turn on are controlled by the logic side EN input. The logic protecting the LTM9100. side also has two status pins, PG for power good and The DC2423A may be configured for other input voltages ALERT to indicate an internal fault. LEDs indicate if either and load currents by changing a handful of components. pin has been activated. The assembly table located on the demo board schematic All logic side signals are referenced to the logic supply lists the component variations between the A and B pin V , which may be connected to V or to the V input versions. L CC L by jumper (JP2) selection. JUMPERS The DC2423A is designed to be used either stand-alone or interfaced directly with a DC590 isolated serial control- DC2423A contains 7 jumpers, and a 14-pin connector ler or a DC2026 Linduino One. The QuickEval software 2 for the I C interface. The jumpers provide either pin or may be used with either the DC590 or DC2026 (when function configuration, a description of jumper follows. running the DC590 Arduino code). Example Arduino JP1: EEPROM Program (PG) or Write Protect (WP). For code specifically for the DC2423A is also available for the 2 factory use only in programming the demo board ID for DC2026. The LTM9100 includes an I C/SMBus interface QuickEval. Default position: Not Populated. for communication to its isolated side control and status functions, as well as ADC results. The isolated side includes JP2: V Supply Jumper. May be connected to V input L CC 2 two jumpers for selection of the I C address. terminal or V (default) input terminal. L The isolated side of the LTM9100 controls the turn-on of JP3: ON Jumper. Enables the LTM9100 in the ON (default) an external MOSFET. The MOSFET leads are connected by position, and disables operation in the OFF position. The screw terminal block, and its body is screw mounted to ON terminal either monitors the state of the ON jumper, a heatsink and PCB. This allows the MOSFET to be easily or if the ON jumper is removed, allows the ON terminal interchanged or replaced. The design can accommodate to be externally driven. TO-247 (default), TO-264, and TO-220 packages. JP4: EN Jumper. Enables the LTM9100 GATE pin, provided The demo board can be connected for either high side or both UV and OV functions are satisfied, in the ON (default) low side applications. Banana jacks are provided and clearly position, and disables GATE in the OFF position. Operation labeled for voltage input and load connection depending of the GATE pin may be subsequently controlled via the 2 on the selected configuration. The line monitor jumper I C interface, but the EN pin must be in the high position. 2 (JP7) must also be configured for the same configuration See the LTM9100 data sheet for I C only operation. The so that the LTM9100 ADC reports the proper input voltage. EN terminal either monitors the state of the EN jumper, LEDs indicate the presence of line voltage in blue and load or if the EN jumper is removed, allows the EN terminal to voltage in yellow once the MOSFET has been turned on. be externally driven. dc2423af 2