PSB2120

ISDN Remote Power Controller (IRPC) PSB 2120 CMOS IC Features q Switched mode DC/DC-converter q Switched mode DC/DC-converter q CCITT (I.430) ISDN compatible q Integrated 200 V power FET (only PSB 2120-P in P-DIP-22) q Low power dissipation q Supply voltage range 10 V to 60 V q Input undervoltage detection q Programmable overcurrent protection q Soft start q Control circuit to achieve minimum start-up current q Power housekeeping input q Oscillator synchronization input/output q Polarity reversal detection q High voltage CMOS-technology 60 V P-DSO-24-1 P-DIP-22 Type PSB 2120-P PSB 2120-T Version V B5 V B5 Ordering Code Q67100-H8645 Q67100-H6278 Package P-DIP-22 P-DSO-24-1 (SMD) The PSB 2120 is a Pulse Width Modulator (PWM) circuit designed for fixed-frequency switching regulators especially for telephony and ISDN-environments. The PSB 2120 is fully compatible with the CCITT-power recommendations on the “S”-interface. Coupled with a few external components it can provide a stable 5 V DC-supply for subscriber terminals (TE’s) or network terminators (NT’s). It can also be programmed for higher output voltages, e.g. to supply the S-lines with 40 V. In telephony and ISDN-systems a high conversion yield is crucial to maintain functionality in all supply conditions via “S”- or “U”-interfaces. The PSB 2120 design and technology realizes high conversion efficiency and low power dissipation. It should be recognized that the PSB 2120 can also be used in numerous DC/DC-convers...