units are effective and the current limit for the entire configuration is equal to the lowest current limit setting. If any of the settings are too low, automatic crossover to current limiting operation will occur and the output voltage will drop. Remote sensing and programming can be used; how- ever, the strapping arrangements shown in the applicable figures show local sensing and program- ming.
3-33 In order to maintain the temperature coefficient and stability specifications of the power supply, the external resistors (Rx) shown in Figure 3-8 should be stable, low noise, low temperature coefficient (less than 30ppm per degree Centigrade) resistors. The value of each resistor is dependant on the maximum voltage rating of the master sup- ply, The value of Rx is this voltage divided by the voltage programming current of the slave supply (l/Kp where Kp is the voltage programming coeffi- cient). The voltage contribution of the slave is
TM 11-6625-2965-14&P
determined by its voltage control setting.
3-34 Auto-Parallel. The strapping patterns for Auto-Parallel operation of two and three power sup-
plies are shown in Figure 3-9. Auto-Parallel operation permits equal current sharing under all load conditions, and allows complete control of the output current from one master power supply. The output current of each slave will be approximately equal to the master’s regardless of the load condi- tions. Because the output current controls of each slave are operative, they should be set to maximum to avoid having the slave revert to constant current operation; this would occur if the master output current setting exceeded the slave’s. In Model 6205B, it is necessary to make internal connections in order to operate the supply in this mode. The internal connections, specified in Figure 3-9, a r e made to the sampling terminals of the current sampling terminals of the current sampling resistor, R54 (see Figure 5-2).
