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TDA6108 参数 Datasheet PDF下载

TDA6108图片预览
型号: TDA6108
PDF下载: 下载PDF文件 查看货源
内容描述: 三路视频输出放大器 [Triple video output amplifier]
分类和应用: 放大器
文件页数/大小: 16 页 / 296 K
品牌: NXP [ NXP ]
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Philips Semiconductors  
Product specification  
Triple video output amplifier  
TDA6108JF  
External flashover protection  
Dissipation  
For sufficient flashover protection it is necessary to apply  
an external diode and 100 resistor for each channel.  
See application note “Application and Product description  
of TDA6107Q/N1” (report number AN96072).  
Regarding dissipation, distinction must first be made  
between static dissipation (independent of frequency) and  
dynamic dissipation (proportional to frequency).  
The static dissipation of the TDA6108JF is due to voltage  
supply currents and load currents in the feedback network  
and CRT.  
To limit the diode current an external 1 kcarbon  
high-voltage resistor in series with the external diode and  
a 2 kV spark gap are needed (for this resistor value, the  
CRT has to be connected to the main PCB).  
The static dissipation Pstat equals:  
Pstat = VDD × IDD + 3 × VO(c) × IO(c)  
VDD must be decoupled to GND:  
Where:  
1. With a capacitor >20 nF with good HF behaviour  
(e.g. foil); this capacitor must be placed as close as  
possible to pins 6 and 4, but definitely within 5 mm.  
VDD = supply voltage  
IDD = supply current  
2. With a capacitor >3.3 µF on the picture tube base  
VO(c) = DC value of cathode voltage  
IO(c) = DC value of cathode current.  
print.  
Switch-off behaviour  
The dynamic dissipation Pdyn equals:  
Pdyn = 3 × VDD × (CL + Cint) × fi × Vo(c)(p-p) × δ  
The switch-off behaviour of the TDA6108JF is controllable.  
This is due to the fact that the output pins of the  
TDA6108JF are still under control of the input pins for low  
power supply voltages (approximately 30 V and higher).  
Where:  
CL = load capacitance  
Cint = internal load capacitance (4 pF)  
fi = input frequency  
Bandwidth  
The addition of the flash resistor produces a decreased  
bandwidth and increases rise and fall times. For further  
information, see Application note of the TDA6108JF.  
Vo(c)(p-p) = output voltage (peak-to-peak value)  
δ = non-blanking duty cycle.  
The IC must be mounted on the picture tube base print to  
minimize the load capacitance CL.  
1999 Oct 29  
10  
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