tda6107jf-n3 NXP Semiconductors, tda6107jf-n3 Datasheet - Page 11

• Manufacturer Part Number: tda6107jf-n3
• Description: Triple Video Output Amplifier
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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 C
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
The DC voltage of V
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 V
To limit the diode current an external 1.5 k 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
V
1. With a capacitor >20 nF with good HF behaviour
2. With a capacitor >3.3 F on the picture tube base
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” .
(1)External protection against higher currents is described
in
2002 Oct 18
DD
“Application Note AN96072”
Triple video output amplifier
(e.g. foil); this capacitor must be placed as close as
possible to pins 6 and 4, but definitely within 5 mm.
print, depending on the CRT size.
must be decoupled to GND:
DD
(pin 6) must be within the operating
.
DD
+ V
diode
.
(1)
.
(1)
(1)
.
.
11
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 P
Where:
The dynamic dissipation P
Where:
The IC must be mounted on the picture tube base print to
minimize the load capacitance C
P
P
stat
dyn
V
I
V
I
C
C
f
V
DD
OC
i
DD
OC
oc(p-p)
L
int
= input frequency
= non-blanking duty cycle.
= load capacitance
=
=
= supply current
= DC value of cathode current.
= internal load capacitance ( 4 pF)
= supply voltage
= DC value of cathode voltage
V
3 V
DD
= output voltage (peak-to-peak value)
DD
I
DD
+
C
3 V
L
+
stat
C
OC
int
dyn
equals:
equals:
I
f
OC
i
L
.
V
oc(p-p)
Product specification
TDA6107JF