PSB2120 Datasheet | Siemens Semiconductor Group

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 patible 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 patible with the CCITT-power remendations on the “S”-interface. Coupled with a few external ponents 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-conversion systems other than ISDN-power supplies. Semiconductor Group PSB 2120 Pin Configurations (top view) P-DSO-24 P-DIP-22 Semiconductor Group PSB 2120 Pin Definitions and Functions Pin Pin No. No. P-DSO P-DIP 1 1 Symbol Input (I) Output (O) I/O Definition Function SYNC Synchronization Input for synchronization of the oscillator to an external frequency, or output to synchronize multiple devices. The external timing ponents of the ramp generator are attached to this pin....