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參數(shù)資料
| 型號： | LNBH221PD |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.75 A DUAL SWITCHING CONTROLLER, PDSO36 |
| 封裝： | POWER, SO-36 |
| 文件頁數(shù)： | 29/29頁 |
| 文件大?。?/td> | 800K |
| 代理商： | LNBH221PD |
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LD39150
Application information
9/27
5
Application information
Basically, the LNBH221 includes two circuits that are completely independent. Each circuit
can be separately controlled and must have its independent external components. All the
below specification must be considered equal for each section.
This IC has a built in DC/DC step-up controller that, from a single supply source ranging
from 8 to 15V, generates the voltages (VUP) that let the linear post-regulator to work at a
minimum dissipated power of 1W typ. @ 500mA load (the linear regulator drop voltage is
internally kept at: VUP-VOUT=2V typ.). An UnderVoltage Lockout circuit will disable the
whole circuit when the supplied VCC drops below a fixed threshold (6.7V typically). The
internal 22KHz tone generator is factory trimmed in accordance to the standards, and can
be controlled either by the I2CTM interface or by a dedicated pin (DSQIN) that allows
immediate DiSEqCTM data encoding (*). When the TEN (Tone ENable) I2C bit it is set to
HIGH, a continuous 22KHz tone is generated on the output regardless of the DSQIN pin
logic status.
The TEN bit must be set LOW when the DSQIN pin is used for DiSEqCTM encoding. The
fully bi-directional DiSEqCTM 2.0 interfacing is completed by the built-in 22KHz tone
detector. Its input pin (DETIN) must be AC coupled to the DiSEqCTM bus, and the extracted
PWK data are available on the DSQOUT pin (*). To comply to the bi-directional DiSEqCTM
2.0 bus hardware requirements an output R-L filter is needed. The LNBH221 is provided
with two output pins: the VOTX to be used during the tone transmission and the VORX to be
used when the tone is received. This allows the 22KHz Tone to pass without any losses due
to the R-L filter impedance (see DiSeqC 2.0 application circuit on page 4). In DiSeqC 2.0
applications during the 22KHz transmission activated by DSQIN pin (or TEN I2C bit), the
VOTX pin must be preventively set ON by the TTX I
2C bit and, both the 13/18V power
supply and the 22KHz tone, are provided by mean of VOTX output. As soon as the tone
transmission is expired, the VOTX must be set to OFF by setting the TTX I
2C bit to zero and
the 13/18V power supply is provided to the LNB by the VORX pin through the R-L filter.
When the LNBH221 is used in DiSeqC 1.x applications the R-L filter is not required (see
DiSeqC 1.x application circuit on pag. 4), the TTX I2C bit must be kept always to HIGH so
that, the VOTX output pin can provide both the 13/18V power supply and the 22KHz tone,
enabled by DSQIN pin or by TEN I2C bit. All the functions of this IC are controlled via I2CTM
bus by writing 6 bits on the System Register (SR, 8 bits). The same register can be read
back, and two bits will report the diagnostic status. When the IC is put in Stand-by (EN bit
LOW), the power blocks are disabled.
When the regulator blocks are active (EN bit HIGH), the output can be logic controlled to be
13 or 18V by mean of the VSEL bit (Voltage SELect) for remote controlling of non-DiSEqC
LNBs. Additionally, the LNBH221 is provided with the LLC I2C bit that increase the selected
voltage value (+1V when VSEL=0 and +1.5V when VSEL=1) to compensate for the excess
voltage drop along the coaxial cable (LLC bit HIGH). By mean of the LLC bit, the LNBH221
is also compliant to the American LNB power supply standards that require the higher
output voltage level to 19.5V (typ.) (instead of 18V), by simply setting the LLC=1 when
VSEL=1. In order to improve design flexibility and to allow implementation of newcoming
LNB remote control standards, an analogic modulation input pin is available (EXTM).
An appropriate DC blocking capacitor must be used to couple the modulating signal source
to the EXTM pin. Also in this case, the VOTX output must be set ON during the tone
transmission by setting the TTX bit high. When external modulation is not used, the relevant
pin can be left open. The current limitation block is SOA type: if the output port is shorted to
ground, the SOA current limitation block limits the short circuit current (ISC) at typically
300mA or 200mA respectively for VOUT 13V or 18V, to reduce the power dissipation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNBH221PD-TR | 功能描述:其他電源管理 LNB Supply/Control RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| LNBH23 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LNBs supply and control IC with step-up and IC interface |
| LNBH23LQTR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 LNB SUPP/CNTRL IC WITH STEP UP RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LNBH23PPR | 功能描述:其他電源管理 LNB supply and control IC RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| LNBH23PPR-CUT TAPE | 制造商:ST 功能描述:LNBH23 Series 15 V 1 A LNB Supply Step-Up I? Interface Controller - PowerSSO-24 |
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