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参数资料
| 型号： | LNBP20CR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PZFM15 |
| 封装： | LEAD FREE, MULTIWATT-15 |
| 文件页数： | 19/25页 |
| 文件大小： | 519K |
| 代理商： | LNBP20CR |
LNBP20
Description (continued)
3/25
1
Description (continued)
For slave operation in single dish, dual receiver systems, the bypass function is
implemented by an electronic switch between the Master Input pin (MI) and the LNBA pin,
thus leaving all LNB powering and control functions to the Master Receiver. This electronic
switch is closed when the device is powered and EN pin is LOW.
The regulator outputs can be logic controlled to be 13 or 18 V (typ.) by mean of the VSEL
pin for remote controlling of LNBs. Additionally, it is possible to increment by 1V (typ.) the
selected voltage value to compensate the excess voltage drop along the coaxial cable (LLC
pin HIGH).
In order to reduce the power dissipation of the device when the lowest output voltage is
selected, the regulator has two Supply Input pins VCC1 and VCC2. They must be powered
respectively at 16V (min) and 23V (min), and an internal switch automatically will select the
suitable supply pin according to the selected output voltage. If adequate heatsink is
provided and higher power losses are acceptable, both supply pins can be powered by the
same 23V source without affecting any other circuit performance.
The ENT (Tone Enable) pin activates the internal oscillator so that the DC output is
modulated by a ±0.3 V, 22KHz (typ.) square wave. This internal oscillator is factory trimmed
within a tolerance of ±2KHz, thus no further adjustments neither external components are
required.
A burst coding of the 22KHz tone can be accomplished thanks to the fast response of the
ENT input and the prompt oscillator start-up. This helps designers who want to implement
the DiSEqCTM protocols (a).
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.
When external modulation is not used, the relevant pin can be left open.
Two pins are dedicated to the overcurrent protection/monitoring: CEXT and OLF. The
overcurrent protection circuit works dynamically: as soon as an overload is detected in
either LNB output, the output is shut-down for a time toff determined by the capacitor
connected between CEXT and GND. Simultaneously the OLF pin, that is an open collector
diagnostic output flag, from HIGH IMPEDANCE state goes LOW.
After the time has elapsed, the output is resumed for a time ton=1/15toff (typ.) and OLF goes
in HIGH IMPEDANCE. If the overload is still present, the protection circuit will cycle again
through toff and ton until the overload is removed. Typical ton+toff value is 1200ms when a
4.7F external capacitor is used.
This dynamic operation can greatly reduce the power dissipation in short circuit condition,
still ensuring excellent power-on start up even with highly capacitive loads on LNB outputs.
The device is packaged in Multiwatt15 for through-holes mounting and in PowerSO-20 for
surface mounting. When a limited functionality in a smaller package matches design needs,
a range of cost-effective PowerSO-10 solutions is also offered. All versions have built-in
thermal protection against overheating damage.
a.
External components are needed to comply to level 2.x and above (bidirectional) DiSEqCTM bus hardware
requirements. DiSEqCTM is a trademark or EUTELSAT.
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| LNBP20PD | 功能描述:线性稳压器 - 标准 LNBP Supply/Control RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| LNBP20PD-TR | 功能描述:线性稳压器 - 标准 LNBP Supply/Control RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| LNBP21 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LNBP SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBP21_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LNBP SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
| LNBP21D2 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LNBP SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE |
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