LNBH25 controller Datasheet

LNBH25 Datasheet, PDF, Equivalent


Part Number

LNBH25

Description

LNB-supply / controller

Manufacture

STMicroelectronics

Total Page 30 Pages
Datasheet
Download LNBH25 Datasheet


LNBH25
LNBH25
LNB supply and control IC with step-up and I²C interface
Features
Complete interface between LNB and I²C bus
Built-in DC-DC converter for single 12 V supply
operation and high efficiency (typ. 93 % @
0.5 A)
Selectable output current limit by external
resistor
Compliant with main satellite receivers output
voltage specification (15 programmable levels)
Accurate built-in 22 kHz tone generator suits
widely accepted standards
22 kHz tone waveform integrity guaranteed
also at no load condition
Low-drop post regulator and high efficiency
step-up PWM with integrated power N-MOS
allowing low power losses
LPM function (low power mode) to reduce
dissipation
Overload and overtemperature internal
protections with I²C diagnostic bits
LNB short-circuit dynamic protection
+/- 4 kV ESD tolerant on output power pins
Applications
STB satellite receivers
TV satellite receivers
PC card satellite receivers
QFN24 (4 x 4 mm)
Description
Intended for analog and digital satellite
receivers/Sat-TV and Sat-PC cards, the LNBH25
is a monolithic voltage regulator and interface IC,
assembled in QFN24 4x4 specifically designed to
provide the 13/18 V power supply and the 22 kHz
tone signalling to the LNB down-converter in the
antenna dish or to the multi-switch box. In this
application field, it offers a complete solution with
extremely low component count and low power
dissipation together with a simple design and I²C
standard interfacing.
Table 1.
Device summary
Order code
LNBH25PQR
Package
QFN24 (4 x 4)
Packaging
Tape and reel
February 2012
Doc ID 022433 Rev 4
1/34
www.st.com
34

LNBH25
Contents
Contents
LNBH25
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 I²C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/34 Doc ID 022433 Rev 4


Features LNBH25 LNB supply and control IC with st ep-up and I²C interface Features ■ Complete interface between LNB and I²C bus ■ Built-in DC-DC converter for s ingle 12 V supply operation and high ef ficiency (typ. 93 % @ 0.5 A) ■ Select able output current limit by external r esistor ■ Compliant with main satelli te receivers output voltage specificati on (15 programmable levels) ■ Accurat e built-in 22 kHz tone generator suits widely accepted standards ■ 22 kHz to ne waveform integrity guaranteed also a t no load condition ■ Low-drop post r egulator and high efficiency step-up PW M with integrated power N-MOS allowing low power losses ■ LPM function (low power mode) to reduce dissipation ■ O verload and overtemperature internal pr otections with I²C diagnostic bits ■ LNB short-circuit dynamic protection +/- 4 kV ESD tolerant on output powe r pins Applications ■ STB satellite r eceivers ■ TV satellite receivers ■ PC card satellite receivers QFN24 (4 x 4 mm) Description Intended for analog and digital sat.
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