PSB2120-P Siemens Semiconductor Group, PSB2120-P Datasheet

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PSB2120-P

Manufacturer Part Number
PSB2120-P
Description
Manufacturer
Siemens Semiconductor Group
Datasheet

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Part Number:
PSB2120-PVB5
Manufacturer:
SIEMENS
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5 510
Part Number:
PSB2120-PVB5
Manufacturer:
ST
Quantity:
5 510
ISDN Remote Power Controller
(IRPC)
Features
Type
PSB 2120-P
PSB 2120-T
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
Switched mode DC/DC-converter
Switched mode DC/DC-converter
CCITT (I.430) ISDN compatible
Integrated 200 V power FET
(only PSB 2120-P in P-DIP-22)
Low power dissipation
Supply voltage range 10 V to 60 V
Input undervoltage detection
Programmable overcurrent protection
Soft start
Control circuit to achieve minimum start-up current
Power housekeeping input
Oscillator synchronization input/output
Polarity reversal detection
High voltage CMOS-technology 60 V
Version
V B5
V B5
Ordering Code
Q67100-H8645
Q67100-H6278
3
P-DSO-24-1
P-DIP-22
Package
P-DIP-22
P-DSO-24-1 (SMD)
PSB 2120
CMOS IC
12.92

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PSB2120-P Summary of contents

Page 1

ISDN Remote Power Controller (IRPC) Features Switched mode DC/DC-converter Switched mode DC/DC-converter CCITT (I.430) ISDN compatible Integrated 200 V power FET (only PSB 2120-P in P-DIP-22) Low power dissipation Supply voltage range Input undervoltage detection ...

Page 2

Pin Configurations (top view) P-DSO-24 Semiconductor Group P-DIP-22 2 PSB 2120 ...

Page 3

Pin Definitions and Functions Pin Pin Symbol Input (I) No. No. P-DSO P-DIP 1 1 SYNC COMP EME 8 8 POL ...

Page 4

Pin Definitions and Functions (cont’d) Pin Pin Symbol Input (I) No. No. P-DSO P-DIP 15 13 ENA GND EXT ...

Page 5

Figure 1 IRPC Functional Diagram Semiconductor Group 5 PSB 2120 ...

Page 6

Functional Description The reference provides a 4.0 V voltage for the regulation loop. A high gain error amplifier compares the reference voltage with the switch mode supply output voltage. The output of the error amplifier is compared with a periodic ...

Page 7

Figure 2 DC/DC-Conversion The PSB 2120 contains a SIPMOS-transistor for power handling. Non-isolated and isolated SMPS- configurations are possible. Logic and analog circuits are implemented in CMOS in order to achieve low power dissipation. The error amplifier compares the sensed ...

Page 8

Polarity Detection Emergency conditions are signaled to the TE by the reversed polarity of the line feeding voltage. When polarity reversal is detected via pin POL of the PSB 2120, emergency conditions are signaled to the microprocessor via pin EME, ...

Page 9

PSB 2120 Applications in ISDN-Environments Figure 3 shows an example out of the wide application field of the PSB 2120. In the network termination one PSB 2120 supplies the internal IC’s directly from the U–interface. A second IRPC, also powered ...

Page 10

Figure 3 IRPC in ISDN-Concept Semiconductor Group 10 PSB 2120 ...

Page 11

Switching Frequency Figure 4 Switching Frequency as a Function of Semiconductor Group R C and PSB 2120 ...

Page 12

Figure 5 PSB 2120 Minimum Configuration Semiconductor Group 12 PSB 2120 ...

Page 13

Figure 6 Advanced IRPC-Application with Power Housekeeping and Polarity Reversal Detection Semiconductor Group 13 PSB 2120 ...

Page 14

According to the application in figure 5 and an output power of 500 mW, will be 400 ms and Figure 7 Generation of a P-Reset Signal with the PSB 2120 Semiconductor Group PSB 2120 t ...

Page 15

Figure 8 PSB 2120 in Flyback Configuration with Transformer Isolation Semiconductor Group 15 PSB 2120 ...

Page 16

Figure 9 PSB 2120 in Flyback Configuration with Opto Isolation Semiconductor Group 16 PSB 2120 ...

Page 17

Absolute Maximum Ratings (All pin references made for P-DIP-22) Parameter Supply voltage DR (pin 10) referred to S0 (pin 11) Continuous drain current (pin 10) Supply voltage V (pin 22) referred to GND BAT Analog/digital input voltage referred to GND ...

Page 18

DC Characteristics (cont’d) Parameter Oscillator SYNC (pin1), RC (pin kHz OSC Initial accuracy f Voltage stability of OSC f Temperature stability of OSC Max. frequency H-sawtooth voltage L-sawtooth voltage ...

Page 19

DC Characteristics (cont’d) Parameter Pulse Width Modulator Duty cycle Undervoltage Detection Start-up threshold Threshold hysteresis C Soft Start (pin 6) SS Charging current Output Driver GA (pin ˚ – Power FET A L ...

Page 20

DC Characteristics (cont’d) Parameter Comparator CN (pin 15), CP (pin 16), Input offset voltage Input bias current Input voltage range Response time to signal at CO (pin 14 Short Circuit (pin 12), I Sense voltage Polarity Detection POL ...

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