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PDF LNBH23 Data sheet ( Hoja de datos )
| Número de pieza | LNBH23 | |
| Descripción | LNBs supply and control IC | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LNBH23
LNBs 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% @ 0.75
A), with integrated NMOS
■ Selectable output current limit by external
resistor
■ Compliant with main satellite receiver systems
specifications
■ New accurate built-in 22 kHz tone generator
suits widely accepted standards (patent
pending)
■ Fast oscillator start-up facilitates DiSEqC™
encoding
■ Built-in 22 kHz tone detector supports bi-
directional DiSEqC™ 2.0
■ Very low-drop post regulator and high
efficiency step-up PWM with integrated power
NMOS allow low power losses
■ Two output pins suitable to by-pass the output
R-L filter and avoid any tone distortion (R-L
filter as per DiSEqC™ 2.0 specs, see typ.
application circuits)
■ Overload and over-temperature internal
protections with I²C diagnostic bits
■ Output voltage and output current level
diagnostic feedback by I²C bits
■ LNB short circuit dynamic protection
■ ± 4 kV ESD tolerant on output power pins
Datasheet − production data
PowerSSO-24
(Exposed pad)
QFN32 (5 x 5 mm.)
(Exposed pad)
Description
Intended for analog and digital satellite
receivers/sat-TV, sat-PC cards, the LNBH23 is a
monolithic voltage regulator and interface IC,
assembled in PowerSSO-24 ePAD and QFN32 (5
x 5 mm.) ePAD, 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, low power
dissipation together with simple design and I²C
standard interfacing.
Table 1.
Device summary
Order code
LNBH23PPR
LNBH23QTR
Package
PowerSSO-24 (Exposed pad)
QFN32 (Exposed pad)
February 2013
This is information on a product in full production.
Doc ID 13356 Rev 8
Packaging
Tape and reel
Tape and reel
1/32
www.st.com
32
1 page  
LNBH23
2 Application information
Application information
Note:
2.1
This IC has a built-in DC-DC step-up converter with integrated NMOS that, from a single
source from 8 V to 15 V, generates the voltages (VUP) that let the linear post-regulator to
work at a minimum dissipated power of 0.375 W Typ. @ 500 mA load (the linear post-
regulator drop voltage is internally kept at VUP-VORX=0.75 V typ.). An under voltage lockout
circuit will disable the whole circuit when the supplied VCC drops below a fixed threshold (6.7
V typically).
In this document the output voltage (VO) is intended as the voltage present at the linear
post-regulator output (VORX pin).
DiSEqC™ data encoding and decoding
The new internal 22 kHz tone generator (patent pending) is factory trimmed in accordance
to the standards, and can be selected by I²C interface TTX bit (or TTX pin) and activated by
a dedicated pin (DSQIN) that allows immediate DiSEqC™ data encoding, or through TEN
I²C bit in case the 22 kHz presence is requested in continuous mode. In stand-by condition
(EN bit LOW) The TTX function must be disabled setting TTX to LOW.
2.2 DiSEqC™ 2.0 implementation
The built-in 22 kHz tone detector completes the fully bi-directional DiSEqC™ 2.0 interfacing
(see Note 1). It’s input pin (DETIN) must be AC coupled to the DiSEqC™ BUS, and
extracted PWK data are available on the DSQOUT pin. To comply to the bi-directional
DiSEqC™ 2.0 bus hardware requirements an output R-L filter is needed. The LNBH23 is
provided with two output pins, one for the dc voltage output (VoRX) and one for the 22 kHz
tone transmission (VoTX). The VoTX must be activated only during the tone transmission
while the VoRX provides the 13/18 V output voltage. This allows the 22 kHz Tone to pass
without any losses due to the R-L filter impedance (see Figure 4 typ. application circuit).
During the 22 kHz transmission, in DiSEqC™ 2.0 applications, activated by DSQIN pin or by
the TEN bit, the VoTX pin must be preventively set ON by the TTX function. This can be
controlled both through the TTX pin and by I²C bit. As soon as the tone transmission is
expired, the VoTX must be disabled by setting the TTX to LOW to set the device in the 22
kHz receiving mode. The 13/18 V power supply is always provided to the LNB from the VoRX
pin through the R-L filter.
2.3 DiSEqC™ 1.X implementation
When the LNBH23 is used in DiSEqC™ 1.x applications the R-L filter is always needed for
the proper operation of the new 22 kHz tone generator (patent pending. See application
circuit). Also in this case, the TTX function must be preventively enabled before to start the
22 kHz data transmission and disabled as soon as the data transmission has been expired.
The tone can be activated both with the DSQIN pin or the TEN I²C bit. The DSQIN internal
circuit activates the 22 kHz tone on the VoTX output with 0.5 cycles ±25 µs delay from the
TTL signal presence on the DSQIN pin, and it stops with 1 cycles ±25 µs delay after the TTL
signal is expired.
Doc ID 13356 Rev 8
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5 Page 
LNBH23
4 Maximum ratings
Maximum ratings
Table 3. Absolute maximum ratings
Symbol
Parameter
VCC-L, VCC DC power supply input voltage pins
VUP DC input voltage
IO Output current
VoRX DC output pin voltage
VoTX Tone output pin voltage
VI
Logic input voltage (TTX, SDA, SCL, DSQIN, EXTM, VCTRL,
ADDR)
LX LX input voltage
VDETIN
VOH
VBYP
ISEL
Detector input signal amplitude
Logic high output voltage (DSQOUT)
Internal reference pin voltage (Note 2)
Current selection pin voltage
TSTG
TJ
Storage temperature range
Operating junction temperature range
ESD rating with human body model (HBM) for all pins unless
6, 19, 20 (for PSSO24) and unless 4, 21, 22 (for QFN32)
ESD
ESD rating with human body model (HBM) for pins 19, 20 (for
PSSO24) and pins 21, 22 (for QFN32)
ESD rating with human body model (HBM) for pin 6 (for
PSSO24) and pin 4 (for QFN32)
Value
-0.3 to 16
-0.3 to 24
Internally Limited
-0.3 to 25
-0.3 to 25
-0.3 to 7
-0.3 to 24
2
-0.3 to 7
-0.3 to 4.6
-0.3 to 4.6
-50 to 150
-25 to 125
2
4
0.6
Unit
V
V
mA
V
V
V
V
VPP
V
V
V
°C
°C
kV
Note: 1 Absolute maximum ratings are those values beyond which damage to the device may occur.
These are stress ratings only and functional operation of the device at these conditions is
not implied. Exposure to absolute-maximum-rated conditions for extended periods may
affect device reliability. All voltage values are with respect to network ground terminal.
2 The BYP pin is intended only to connect an external ceramic capacitor. Any connection of
this pin to external current or voltage sources may cause permanent damage to the device.
Table 4. Thermal data
Symbol
Parameter
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient (PowerSSO-
24) with device soldered on 2s2p PC Board
QFN32
2
35
PowerSSO-24
2
30
Unit
°C/W
°C/W
Doc ID 13356 Rev 8
11/32
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LNBH23.PDF ] | |
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