PSB2120 Datasheet, PDF (1/20 Pages) Siemens Semiconductor Group – ISDN Remote Power Controller

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-conversion
systems other than ISDN-power supplies.
Semiconductor Group
3
12.92