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LNBH26 Datasheet(PDF) 2 Page - STMicroelectronics

Part # LNBH26
Description  Dual LNBS supply and control IC with step-up and I짼C interface
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LNBH26 Datasheet(HTML) 2 Page - STMicroelectronics

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Contents
LNBH26
2/38
Doc ID 022771 Rev 1
Contents
1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Application information (valid for each section A/B) . . . . . . . . . . . . . . . 4
2.1
DISEQC™ data encoding (DSQIN pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2
Data encoding by external 22 kHz tone TTL signal . . . . . . . . . . . . . . . . . . 4
2.3
Data encoding by external DiSEqC envelope control
through the DSQIN pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4
LPM (low power mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.5
DISEQC™ 2.0 implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6
Output current limit selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.7
Output voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.8
Diagnostic and protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.9
Surge protections and TVS diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.10
FLT: Fault FLAG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.11
VMON: output voltage diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.12
TMON: 22 kHz tone diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.13
TDET: 22 kHz tone detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.14
IMON: minimum output current diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.15
PDO: overcurrent detection on output pull-down stage . . . . . . . . . . . . . . . 8
2.16
Power-on I²C interface reset and undervoltage lockout . . . . . . . . . . . . . . . 8
2.17
PNG: input voltage minimum detection . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.18
ISW: inductor switching current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.19
COMP: boost capacitor ESR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.20
OLF: overcurrent and short-circuit protection and diagnostic . . . . . . . . . . . 9
2.21
OTF: thermal protection and diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5
Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6
I²C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18



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