LNBP8L LNB SUPPLY AND CONTROL VOLTAGE REGULATOR
Intended for analog and digital satellite receivers, the LNBP is a monolithic linear voltage regulator, assembled in the DFN8 (5 x 6) and IPPAK packages, specifically designed to provide the powering voltages and the interfacing signals to the LNB down-converter. The regulator output can be logic controlled for 13 V or 18 V (typ.) by means of the EN/VSEL 3-state pin for remotely controlling the LNB. When the IC is powered and put in standby (EN/VSEL pin at high impedance), the regulator output is disabled. In order to reduce power dissipation, the LNBP10L/11L versions (on DFN package) feature 2 supply inputs: VCC1and VCC2. These pins must be powered, respectively, at 15 V (min.) and 22 V (min.), and an internal switch will automatically select the appropriate supply voltage according to the selected output voltage. The LNBP8L/9L versions (in the IPPAK package) have only one supply input pin, which must be supplied at 22 V (min.). Additionally, the LNBP10L/11L versions have the LLC pin to increment the selected output voltage value by 1 V (typ.) to compensate for the excess voltage drop along the coaxial cable (LLC pin HIGH). An analog 22 kHz modulation input pin (EXTM) is available in the LNBP8L and LNBP10L versions. An appropriate DC blocking capacitor must be used to couple the modulating signal source to the EXTM pin. The LNBP10L/11L versions are also equipped with over-current dynamic protection: as soon as an overload is detected the output is shut down for the time TOFF, which is determined by the capacitor connected between the CEXT pin and GND. After the time has elapsed, the output is resumed for a time TON= (1/12)*TOFF(typ.). If the overload is still present, the protection circuit will cycle again through TOFFand TONuntil the overload is removed. A typical TON+TOFFvalue is 1100 ms when a 4.7 μF external capacitor is used on the CEXT. This dynamic operation can greatly reduce the power dissipation in short-circuit condition, while ensuring excellent power-on startup even with highly capacitive loads on the LNB outputs. The device is packaged in the IPPAK for through-hole mounting and in the DFN8 (5 x 6) for surface mounting. Both package solutions are offered in two versions: with ten pins (LNBP9L/11L) to use with the integrated 22 kHz tone generator, or with the EXTM pin (LNBP8L/10L) to use external 22 kHz sources. All versions have built-in thermal protection to prevent overheating damage
技术特性
- Simplest integrated solution for LNB remote supply and control
- 500 mA guaranteed output current
- Dual input supply for reducing power dissipation (DFN package)
- 3-state function to enable/disable and select the output voltage level through a single pin
- Fast oscillator startup for DiSEq™ encoding (LNBP9L/11L versions)
- External 22 kHz modulation input pin (LNBP8L/10L versions)
- Cable length compensation, LLC pin (LNBP10L, LNBP11L versions)
- Short-circuit and over-temperature protection
- LNB overload and short-circuit dynamic protection (LNBP10L, LNBP11L versions)
- Available in DFN8 (5 x 6 mm) and IPPAK packages
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功能框图
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LNBP8L 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| LNBP8LIT |
Active |
|
1000 |
IPPAK 5LDS |
Tube |
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LNBP8LIT |
DATASHEET
| 描述 |
版本 |
大小 |
| LNBP8L : LNB SUPPLY AND CONTROL VOLTAGE REGULATOR |
2 |
440KB |
