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ZNBG3000
FUNCTIONAL DIAGRAM
ZNBG3001
FUNCTIONAL DESCRIPTION
The ZNBG devices provide all the bias requirements for external FETs, including the generation
of the negative supply required for gate biasing, from the single supply voltage.
The diagram above shows a single stage from the ZNBG series. The ZNBG3000/1 contains 3 such
stages.
The drain voltage of the external FET Q N is set by the ZNBG device to its normal operating voltage.
This is determined by the on board V D Set reference, for the ZNBG3000 this is nominally 2.2 volts
whilst the ZNBG3001 provides nominally 2 volts.
The drain current taken by the FET is monitored by the low value resistor I D Sense. The amplifier
driving the gate of the FET adjusts the gate voltage of Q N so that the drain current taken matches
the current called for by an external resistor R CAL . Both ZNBG devices have the facility to program
different drain currents into selected FETs.
Since the FET is a depletion mode transistor, it is usually necessary to drive its gate negative with
respect to ground to obtain the required drain current. To provide this capability powered from
a single positive supply, the device includes a low current negative supply generator. This
generator uses an internal oscillator and two external capacitors, C NB and C SUB .
4-141
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ZNBG3010Q16 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER AND POLARITY SWITCH
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ZNBG3011 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:FET BIAS CONTROLLER AND POLARITY SWITCH
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