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ZNBG3113
ZNBG3114
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 ZNBG3113/14 contains 3 such stages. The
negative rail generator is common to both devices.
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 ZNBG3113 this is nominally 2.2 volts
whilst the ZNBG3114 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 Q N so that the drain current taken matches
the current called for by an external resistor R CAL .
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, C NB and C SUB .
4-130
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相关代理商/技术参数
ZNBG3114 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:FET BIAS CONTROLLER WITH POLARISATION
ZNBG3114Q20 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115_06 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115Q16 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115Q16TC 功能描述:MOSFET 3BIAS TONE H/V SWTCH 2.2V RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube
ZNBG3115Q20 制造商:ZETEX 制造商全称:ZETEX 功能描述:FET BIAS CONTROLLER WITH POLARISATION SWITCH AND TONE DETECTION
ZNBG3115Q20TC 功能描述:MOSFET 3BIAS TONE H/V SWTCH 2.2V RoHS:否 制造商:STMicroelectronics 晶体管极性:N-Channel 汲极/源极击穿电压:650 V 闸/源击穿电压:25 V 漏极连续电流:130 A 电阻汲极/源极 RDS（导通）:0.014 Ohms 配置:Single 最大工作温度: 安装风格:Through Hole 封装 / 箱体:Max247 封装:Tube