Contents

LNBH25S

2/37

DocID026736 Rev 2

Contents

1

Block diagram.................................................................................. 6

2

Application information .................................................................. 7

2.1

DiSEqC data encoding (DSQIN pin) ................................................. 7

2.2

Data encoding by external 22 kHz tone TTL signal........................... 7

2.3

Data encoding by external DiSEqC envelope control through the

DSQIN pin...................................................................................................... 8

2.4

LPM (low power mode) ..................................................................... 8

2.5

DiSEqC 2.0 implementation .............................................................. 8

2.6

Output current limit selection............................................................. 9

2.7

Output voltage selection.................................................................... 9

2.8

Diagnostic and protection functions .................................................. 9

2.9

Surge protections and TVS diodes.................................................... 9

2.10

FLT (fault flag)................................................................................. 10

2.11

VMON (output voltage diagnostic) .................................................. 10

2.12

TMON (22 kHz tone diagnostic) ...................................................... 10

2.13

TDET (22 kHz tone detection)......................................................... 10

2.14

IMON (minimum output current diagnostic)..................................... 11

2.15

PDO (overcurrent detection on output pull-down stage) ................. 11

2.16

Power-on I²C interface reset and undervoltage lockout .................. 11

2.17

PNG (input voltage minimum detection).......................................... 11

2.18

ISW (inductor switching current limit) .............................................. 11

2.19

COMP (boost capacitors and inductor) ........................................... 11

2.20

OLF (overcurrent and short-circuit protection and diagnostic) ........ 12

2.21

OTF (thermal protection and diagnostic) ......................................... 12

3

Pin configuration ........................................................................... 13

4

Maximum ratings ........................................................................... 15

5

Typical application circuits........................................................... 16

6

I²C bus interface ............................................................................ 19

6.1

Data validity..................................................................................... 19

6.2

Start and stop condition .................................................................. 19

6.3

Byte format...................................................................................... 19

6.4

Acknowledge................................................................................... 19