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參數(shù)資料
| 型號： | LNBEH21PD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND IC INTERFACE |
| 中文描述： | LNB電源與控制集成電路升壓轉(zhuǎn)換器及IC的接口 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 588K |
| 代理商： | LNBEH21PD |
LNBEH21
10/22
Figure 7: DETIN/DSQOUT Circuit
Figure 8: DETIN/DSQOUT Waveform
13/18V Control Word mode, OM=1
When OM=1 the VOM is used to force the DC/DC Converter output voltage (V
UP
) in a steady state and to
control the TEN/VSEL pin function. According to the VOM selection TEN/VSEL will absolve two different
functions:
1)VOM=0 - TEN/VSEL pin controls both the post regulator output voltage (V
OUT
) and the DC/DC
Converter output voltage (V
UP
).
2)VOM=1 - TEN/VSEL pin controls only the post regulator output voltage while the DC/DC Converter
output voltage is forced in a steady state, at the high level, 22.7V typ. with LLC=1 and 21.7V typ. if LLC=0.
During normal operation, when no 13/18V control word is transmitted, the device must work with VOM=0
and TEN/VSEL pin is used to select the odd or even numbered transponder setting up the post regulator
output voltage in a steady state (13.25 or 19.5V); the V
UP
voltage is selected by the IC according to the
V
OUT
value in order to minimize the power dissipation.
Before the beginning of the 13/18V Control Word Communication, it is mandatory to set VOM at HIGH
level forcing the V
UP
at 21.7V typ.; after a certain setup time the μP can start to send the 13/18V pulses
command to the TEN/VSEL pin. During the 13/18V pulses, the V
OUT
rise and fall time between 13.25V
and 19.5V of are fully controlled by the internal voltage reference and they are maintained on a typical
value of 575μs, this time is guaranteed with a maximum output capacitance of 330nF and a load current
in the range of 6 to 450mA. As soon as the communication has expired VOM bit must be set LOW to avoid
any additional power dissipation (See Thermal Design Note). Refer to 13/18V Control Word section in the
complete truth table on page 11 for detailed logic combination and corresponding function description.
Tone
Detector
DSQOUT
DETIN
C6
100nF
to DiSEqC bus
VDD
(5V)
PWK data out
R1
2.5K
LNBEH21
0
5V
CH1=22KHz Tone to DETIN, CH2=PWK data at DSQOUT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNBEH21PD-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 |
| LNBEH221PD-R | 制造商:STMicroelectronics 功能描述:LNBEH221PD-R - Tape and Reel |
| LNBH2 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBH21 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBH21PD | 功能描述:其他電源管理 LNB Supply/Cont 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 |
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