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ZNBG2000 Datasheet(PDF) 4 Page - Diodes Incorporated |
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ZNBG2000 Datasheet(HTML) 4 Page - Diodes Incorporated |
4 / 7 page 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 ZNBG2000/1 contains 2 such stages. The drain voltage of the external FET QN is set by the ZNBG device to its normal operating voltage. This is determined by the on board VD Set reference, for the ZNBG2000 this is nominally 2.2 volts whilst the ZNBG2001 provides nominally 2 volts. The drain current taken by the FET is monitored by the low value resistor ID Sense. The amplifier driving the gate of the FET adjusts the gate voltage of QN so that the drain current taken matches the current called for by an external resistor RCAL. 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, CNB and CSUB. ISSUE 1 - AUGUST 2001 4 ZNBG2000 ZNBG2001 FUNCTIONAL DIAGRAM 7 |
Similar Part No. - ZNBG2000 |
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Similar Description - ZNBG2000 |
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