TDA6120Q Datasheet, PDF (11/16 Pages) NXP Semiconductors – Video output amplifier

Philips Semiconductors
Video output amplifier
Preliminary specification
TDA6120Q
TEST AND APPLICATION INFORMATION
Dissipation
Regarding dissipation, distinction must be made between
static dissipation (independent of frequency) and dynamic
dissipation (proportional to frequency). The static
dissipation of the TDA6120Q is due to supply currents, and
currents in the feedback network and CRT.
The static dissipation is given by the following equation:
P_stat = V_CC × I_CC + V_DD × I_DD – V_OUTC × -R----_f^V---_–--^O--I-^U-_O---^T-_U--^C--_T---_C-
Where:
R_f = feedback resistance
I_OUTC = DC cathode current.
The dynamic dissipation is given by the following equation:
P_dyn = V_DD × (C_L + C_int) × f × V_{OUTC (p – p)} × b
Where:
C_L = load capacitance
C_int = effective internal load capacitance
(approximately 7 pF)
f = frequency
V_OUTC(p-p) = output voltage (peak-to-peak value)
b = non-blanking duty cycle (0.8).
The IC must be mounted on the picture tube base
printed-circuit board to minimize the load capacitance C_L.
Switch-off
The voltage at output pins OUT and OUTC will be pulled
to ground when the low voltage supply voltage (V_CC) is
switched off.
1997 Aug 27
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