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TDA6107JF Datasheet(PDF) 11 Page - NXP Semiconductors |
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TDA6107JF Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 20 page 2002 Oct 18 11 Philips Semiconductors Product specification Triple video output amplifier TDA6107JF Cathode output The cathode output is protected against peak current (caused by positive voltage peaks during high-resistance flash) of 3 A maximum with a charge content of 100 µC (1). The cathode is also protected against peak currents (caused by positive voltage peaks during low-resistance flash) of 6 A maximum with a charge content of 100 nC (1). The DC voltage of VDD (pin 6) must be within the operating range of 180 to 210 V during the peak currents. Flashover protection The TDA6107JF incorporates protection diodes against CRT flashover discharges that clamp the cathodes output voltage up to a maximum of VDD +Vdiode. To limit the diode current an external 1.5 k Ω carbon high-voltage resistor in series with the cathode output and a 2 kV spark gap are needed (for this resistor value, the CRT has to be connected to the main PCB (1). VDD must be decoupled to GND: 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. 2. With a capacitor >3.3 µF on the picture tube base print, depending on the CRT size. Switch-off behaviour The switch-off behaviour of the TDA6107JF is controllable. This is because the output pins of the TDA6107JF are still under control of the input pins for low power supply voltages (approximately 30 V and higher). Bandwidth The addition of the flash resistor produces a decreased bandwidth and increases the rise and fall times; see “Application Note AN96072”. Dissipation Regarding dissipation, distinction must first be made between static dissipation (independent of frequency) and dynamic dissipation (proportional to frequency). The static dissipation of the TDA6107JF is due to voltage supply currents and load currents in the feedback network and CRT. The static dissipation Pstat equals: Where: VDD = supply voltage IDD = supply current VOC = DC value of cathode voltage IOC = DC value of cathode current. The dynamic dissipation Pdyn equals: Where: CL = load capacitance Cint = internal load capacitance (≈4 pF) fi = input frequency Voc(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. (1)External protection against higher currents is described in “Application Note AN96072”. P stat V DD I DD 3V OC I OC × × + × = P dyn 3V DD C L C int + () f i V oc(p-p) δ × × × × × = |
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