9397 750 14728 © Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet Rev. 02 — 28 April 2005 10 of 16
Philips Semiconductors TDA6107AJF
Triple video output amplifier
Tolimit the diode current an external 1.5 kΩcarbon 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).
VDD must be decoupled to GND:
1. With a capacitor > 20 nF with good HF behavior (e.g. foil); this capacitor must be
placed as close as possible to pins VDD and GND and must be within 5mm.
2. With a capacitor > 3.3 µF on the picture tube base print, depending on the CRT size.
10.3 Switch-off behavior
The switch-off behavior of the TDA6107AJF is controllable. This is because the output
pins of the TDA6107AJF are still under control of the input pins for low power supply
voltages (approximately 30V and higher).
10.4 Bandwidth
The addition of the flash resistor produces a decreased bandwidth and increases the rise
and fall times.
10.5 Dissipation
Adistinction must first be made between static dissipation (independent of frequency) and
dynamic dissipation (proportional to frequency).
The static dissipation of the TDA6107AJF is due to voltage supply currents and load
currents in the feedback network and CRT.
The static dissipation Pstat equals: Pstat =V
DD ×IDD +3×Voc ×Ioc
Where:
VDD = supply voltage
IDD = supply current
Voc = DC value of cathode output voltage
Ioc = DC value of cathode output current
The dynamic dissipation Pdyn equals: Pdyn =3×VDD ×(CL+C
int)×fi×Voc(p-p) ×δ
Where:
CL= load capacitance
Cint = internal load capacitance (≈4 pF)
fi= input frequency
Voc(p-p) = cathode output voltage (peak-to-peak value)
δ= non-blanking duty cycle
The TDA6107AJF must be mounted on the picture tube base print to minimize the load
capacitance.