|
|
PDF LNBH24 Data sheet ( Hoja de datos )
| Número de pieza | LNBH24 | |
| Descripción | Dual LNB supply and control IC | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LNBH24 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
LNBH24
Dual LNB supply and control IC with step-up and I²C interface
Features
■ Complete interface between LNBS and I²C bus
■ Built-in DC-DC converter for single 12 V supply
operation and high efficiency (typ. 93%@0.5 A)
www.DataSheet4U.com
■ Selectable output current limit through external
resistor
■ Compliant with main satellite receivers output
voltage specification
■ New accurate built-in 22 kHz tone generator
meets 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
N-MOS allow low power losses
■ Two output pins suitable for bypassing the
output R-L filter and avoiding 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
PowerSSO-36 (ePad)
monolithic voltage regulator and interface IC,
assembled in PowerSSO-36 ePad, specifically
designed to provide the 13/18 V power supply and
the 22 kHz tone signalling for two independent
LNB down-converters in the antenna dishes
and/or multi-switch box. In this application field, it
offers a dual tuner STBs with extremely low
component count, low power dissipation together
with simple design and I2C standard interfacing.
Description
Intended for analog and digital DUAL Satellite
receivers/Sat-TV, sat-PC cards, the LNBH24 is a
Table 1. Device summary
Order code
Package
LNBH24PPR
PowerSSO-36 (Exposed pad)
Packaging
Tape and reel
August 2008
Rev 2
1/30
www.st.com
30
1 page  
LNBH24
2 Introduction
Introduction
The LNBH24 includes two completely independent sections. Except for the VCC and I²C
inputs, each circuit can be separately controlled and have independent external
components. The specification that follow should be considered equally for both sections
(A/B).
2.1
www.DataSheet4U.com
Note:
2.2
Application information
This IC has a built-in DC-DC step-up converter which, from a single 8 V to 15 V source,
generates the voltages (VUP) that allow 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 held at VUP-VOUT=0.75 V typ.). An under voltage lockout circuit will disable the
entire circuit when the supplied VCC drops below a fixed threshold (6.7 V typically).
In this document the VOUT 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
with the standards, and can be selected through I²C interface TTX bit (or TTX pin) and
activated by a dedicated pin (DSQIN) which allows immediate DiSEqC™ data encoding, or
through TEN I²C bit in case the 22 kHz presence is requested in continuous mode. In
standby condition (EN bit LOW). The TTX function must be disabled setting TTX to LOW.
2.3 DiSEqC™ 2.0 implementation
The built-in 22 kHz Tone detector completes the fully bi-directional DiSEqC™ 2.0 (see Note:)
interfacing. Its input pin (DETIN) must be AC coupled to the DiSEqC™ bus, and extracted
PWK data are available on the DSQOUT pin. To comply with the bi-directional DiSEqC™ 2.0
bus hardware requirements an output R-L filter is needed. The LNBH24 is provided with two
output pins for each section, 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). 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 the 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.
2.4 DiSEqC™ 1.X implementation
When the LNBH24 is used in DiSEqC™ 1.x applications the R-L filter is always needed for
the proper operation of the 22 kHz tone generator (patent pending. See Figure 4). 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
5/30
5 Page 
LNBH24
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
www.DataSheet4U.com VI
Tone output pin voltage
Logic input voltage (TTX, SDA, SCL, DSQIN, EXTM, VCTRL, Address)
LX LX input voltage
VDETIN
VOH
VBYP
ISEL
Detector input signal amplitude
Logic high output voltage (DSQOUT)
Internal reference pin voltage (Note 1)
Current selection pin voltage
TSTG
TJ
ESD
Storage temperature range
Operating junction temperature range
ESD rating with Human Body Model (HBM) for all pins unless 8, 11,
25, 26, 31, 32
ESD rating with Human Body Model (HBM) for pins 25, 26, 31, 32
ESD rating with Human Body Model (HBM) for pins 8, 11
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
V
V
V
V
VPP
V
V
V
°C
°C
KV
Note:
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.
Note: 1 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 (PSSO-36) with device
soldered on 2s2p PC Board
Value
2
30
Unit
°C/W
°C/W
11/30
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LNBH24.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LNBH2 | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE | STMicroelectronics |
| LNBH21 | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE | STMicroelectronics |
| LNBH21PD | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE | STMicroelectronics |
| LNBH21PD-TR | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE | STMicroelectronics |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |