PEB2023 View Datasheet(PDF) - Infineon Technologies

Part Name

Description

Manufacturer

PEB2023

ISDN DC Converter Circuit

Infineon Technologies 

PEB 2023

PEF 2023

Figure 3 shows the PEB/F 2023 in flyback configuration with transformer isolation using

supply voltage range 3. This application circuit is used to supply the internal IC’s of the

NT from the U-interface and also to supply the S-interface in case of restricted power

mode. The DC/DC-converter begins operating when the input voltage exceeds 38V

(UZD+8V, see supply voltage range 3). In the start-up phase the PEB/F 2023 is supplied

through VS. After this start-up phase, the PEB/F 2023 is supplied via VEXT (power

housekeeping input) and the DC/DC-converter will operate until the input voltage falls

below 20V (input undervoltage detection). For power saving reasons the value of resistor

R6 is as high as possibile.

The maximum static VIN input voltage in this example is 120V. How to get a higher

maximum dynamic VIN input voltage see chapter „1.6 Surge Protection“ on pages 14 and

15.

To get a very fast input undervoltage detection see chapter „1.7 Fast Input Undervoltage

Detection“ on page 15.

38 (20) ... 120 V

ZD1

BZV55C30

R6

10ΜΩ/10%

R5

N1

0.47µF

0.56Ω/5%

20%

C5 +

T1

BSP 89

C6 +

100µF

20%

7 11 12 5 6 2 4

V UV UVx V C

I

GA

S

EXT SS

P

PEB 2023

PEF 2023

GND RC

3 14

V

REF

V

P

SYNC

COMP

V

N

1 9 13 8 10

R1

39ΚΩ

R2

47ΚΩ/5%

BAW 76

5%

C2

R3 33ΚΩ

1%

D1

C1

+ C3

100nF

10%

+ C4

N3

1nF

1µF

5%

20%

10µF

R4

20%

0V

68ΚΩ/1%

BYS 21-45

D2

CL1 +

N2a 220µF

20%

CL2 +

N2b 68µF

20%

D3

BAS 21

BYS 21-45

D4

CL3 +

N2c 100µF

20%

+5V

RLoad1

82Ω/1%

0V

RLoad2

3.9ΚΩ/1%

- 40 V

RLoad3

130Ω/1%

2.4 V

Figure 3 PEB/F 2023 in Flyback Configuration with Transformer Isolation

Data Sheet

10

04.99

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