ISDN CTLR 5V 20-Pin DSO

The IHPC is an integrated power controller especially designed for feeding two-wire ISDN-transmission lines. One line can be powered by one IHPC. An external resistor defines the value of the current-limit for the line. Powering can be switched on or off by the logic inputs “PFEN” and “PFENQ”. With a logic low at the “APFI” output the IHPC signals that current-limiting is active; this signal is low-pass filtered. An external capacitor defines the corner frequency of this low-pass filter and the resulting delay time respectively. A second external capacitor is needed to make sure that longitudinal disturbances (AC) will not produce a current limiting effect. Line current-limiting and reducing this limiting level in case of overtemperature guards the IHPC against overloads.

• Battery voltage up to 130 V
• Supplies power for one transmission line
• Current limiting and chip temperature control
• Limiting current can be programmed by an external resistor
• Automatically reduced feeding current in case of overtemperature
• Reliable 170 V Smart Power Technology (SPT 170)
• Small P DSO-20 package