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TDA6107JF Datasheet(PDF) 11 Page - NXP Semiconductors

No. de pieza TDA6107JF
Descripción Electrónicos  Triple video output amplifier
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA6107JF Datasheet(HTML) 11 Page - NXP Semiconductors

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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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