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PDF PSB2121-P Data sheet ( Hoja de datos )
| Número de pieza | PSB2121-P | |
| Descripción | General-Purpose Power Controller | |
| Fabricantes | Siemens Semiconductor Group | |
| Logotipo |  |
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General-Purpose Power Controller
(GPPC)
Features
q Switched mode DC/DC-converter
q CCITT ISDN compatible
q Low power dissipation
q Supply voltage range 8 to 70 V
q Programmable input undervoltage protection
q Programmable overcurrent protection
q Soft start
q Power housekeeping input
q Oscillator synchronization input/output
q High voltage CMOS-technology 70 V
PSB 2121
CMOS IC
P-DSO-20-1
P-DIP-16
Type
PSB 2121-P
PSB 2121-T
Version
V A4/A5
V A4/A5
Ordering Code
Q67100-H8646
Q67100-H6032
Package
P-DIP-16
P-DSO-20-1 (SMD)
The PSB 2121 is a pulse width modulator circuit designed for fixed-frequency switching regulators
with very low power consumption.
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 2121 design and technology realize high
conversion efficiency and low power dissipation.
It should be recognized that the PSB 2121 can also be used in numerous DC/DC-conversion
systems other than ISDN-power supplies.
Semiconductor Group
1
12.92
1 page  
PSB 2121
Absolute Maximum Ratings
Parameter
Supply voltage (pin VS) referred to GND
Analog input voltage
(pins IP, IN, PWMP, VP, VN, SYNC, OR, OC)
referred to GND
Reference output current (pin VREF)
SYNC output current (pin SYNC)
Error amplifier output current (pin EO)
Z-current (pin VEXT)
Output current (pin VEXT)
Driver output current (pin GA)
Ambient temperature under bias
Storage temperature
Symbol
VS
VI A
Limit Values
80
6
IO REF
IO SYNC
IO Amp
IZ EXT
IO EXT
ID R
TA
Tstg
–5
–5
–5
2
–5
–5
– 25 to 85
– 40 to 125
Unit
V
V
mA
mA
mA
mA
mA
mA
˚C
˚C
DC-Characteristics
TA = 0 to 70 ˚C, VS = 9 to 70 V
Parameter
Supply current
Symbol
IS
Limit Values
min. typ. max.
30 50
Unit Test Condition
µA VS EXT ≥ 6.2 V
Reference VREF
Output voltage
Line regulation
Load regulation
Temperature stability
Load current
VREF O
3.92 4.0
VREF Line
VREF Load
20
VREF TS
IREF Load
25
4.08 V
TA = 25 ˚C
IL = 0 mA,
VS = 40 V
60 mV VS = 20 to 60 V
TA = 25 ˚C
IL = 0 mA
40 mV IL = 0.1 to 0.3 mA
VS = 40 V,
TA = 25 ˚C
mV 0 … 70 ˚C
0.5 mA
Semiconductor Group
5
5 Page 
PSB 2121
Extended Input Voltage Range
Some DC/DC-converter applications require a higher input voltage than the maximum supply
voltage of the PSB 2121 which is limited to 70 V. Figure 4 shows a method to extend the input
voltage range by connecting a zener-diode between the input voltage and VS of the PSB 2121.
Figure 4
If the PSB 2121 is fed via VEXT, the input current at pin VS is approx. 30 µA. The additional power
losses are accordingly 30 µA × VZ; the minimum input voltage is VZ + 8 V.
PSB 2121 Applications
The PSB 2121 accommodates both galvanically isolated and non-isolated configurations.
Figure 5 shows a non-isolated 1 W flyback converter. The converter is fully compatible with the
CCITT-power recommendations on the S-interface. At an input voltage of 40 V, the efficiency is
64 % at an input power of 250 mW and 86 % at an input power of 900 mW.
Figure 6 shows a 4 W flyback converter with opto isolation to feed the S-bus with 40 V. The
maximum input voltage is extended from 70 V to 100 V.
Semiconductor Group
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet PSB2121-P.PDF ] | |
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