ZNBG3211Q20 データシートの表示（PDF） - Zetex => Diodes

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ZNBG3211Q20

FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION

Zetex => Diodes 

ZNBG3210

ZNBG3211

The following schematic shows the function of the VPOL input. Only one of the two external FETs

numberd Q1 and Q2 are powered at any one time, their selection is controlled by the input VPOL.

This input is designed to be wired to the power input of the LNB via a high value (10k) resistor.

With the input voltage of the LNB set at or below 14V, FET Q2 will be enabled. With the input

voltage at or above 15.5V, FET Q1 will be enabled. The disabled FET has its gate driven to 0V and

its drain terminal is switched open circuit. FET number Q3 is always active regardless of the

voltage applied to VPOL.

Control Input Switch Function

Input Sense Polarisation Select

⇐⇐≤14

volts

Vertical

FET Q2

≥ 15.5 volts Horizontal FET Q1

67-9

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