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ZNBG3115Q20 Datasheet(PDF) 7 Page - Zetex Semiconductors |
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ZNBG3115Q20 Datasheet(HTML) 7 Page - Zetex Semiconductors |
7 / 14 page ZNBG3115 ZNBG3116 ISSUE 1 - JUNE 2001 7 FUNCTIONAL DIAGRAM 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 ZNBG3115/16 contains 3 such stages. The negative rail generator is common to both devices. 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 ZNBG3115 this is nominally 2.2 volts whilst the ZNBG3116 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. Since the FET is a depletion mode transistor, it is often 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. |
Similar Part No. - ZNBG3115Q20 |
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Similar Description - ZNBG3115Q20 |
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