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TEA2037A
HORIZONTAL AND VERTICAL DEFLECTION MONITOR
1/14May 2004
TEA2037AHORIZONTAL AND VERTICAL DEFLECTION MONITOR
REV. 2
FEATURES SUMMARY DIRECT LINE DARLINGTON DRIVE DIRECT FRAME-YOKE DRIVE (± 1A) COMPOSITE VIDEO SIGNAL INPUT
CAPABILITY FRAME OUTPUT PROTECTION AGAINST
SHORT CIRCUITS PLL HORIZONTAL OSCILLATOR FREQUENCY
RANGE FROM 15kHz TO 100kHz VERTICAL OSCILLATOR FREQUENCY
RANGE FROM 30Hz TO 120Hz VERY FEW EXTERNAL COMPONENTS VERY LOW COST POWER PACKAGE
DESCRIPTIONThe TEA2037A is an horizontal and vertical de-
flection circuit. It uses the same concept as
TEA2117 but optimised for small screens, for a
very low cost solution.
Figure 1. Package
Figure 2. Pin Connections
TEA2037A
Figure 3. Block Diagram
Table 1. Absolute Maximum Ratings
Table 2. Thermal Data
3/14
TEA2037A
ELECTRICAL CHARACTERISTICS (Tamb = 25°C)
Table 3. Supply (shunt regulator) (Pin 16)
Table 4. Video Input (Pin 15)
Table 5. Line Oscillator (Pin 9)
Table 6. Line Output (Pin 14)
Table 7. Line Flyback Input (Pin 11)
TEA2037A
Table 8. Phase Detector
Table 9. Frame Oscillator (Pin 1)
Table 10. Frame Power Supply (Pin 7)
Table 11. Flyback Generator Supply (Pin 2)
5/14
TEA2037A
Table 12. Frame Output (Pin 8)
Table 13. Flyback Generator (Pin 2 and 3)The TEA2037A performs all the video and power
functions required to provide signals for the direct
drive of the line darlington and frame yoke.
It contains: A shunt regulator A synchronization separator An integrated frame separator without external
components A saw-tooth generator for the frame A power amplifier for direct drive of frame yoke
(short circuit protected) An open collector output for the line darlington
drive A line phase detector and a voltage control
oscillator.
The slice level of sync-separation is fixed by value
of the external resistors R1 and R2. VR is an inter-
nally fixed voltage.
The sync-pulse allows the discharge of the capac-
itor by a 2 x 1 current. A line sync-pulse is not able
to discharge the capacitor under VZ/2. A frame
sync pulse permits the complete discharge of the
capacitor, so during the frame sync-pulse Q3 and
Q4 provide current for the other parts of the circuit.
TEA2037A
Figure 4. Synchronization Separator Circuit Figure 5. Frame SeparatorThe oscillator thresholds are internally fixed by re-
sistors. The discharge of the capacitor depends on
the internal resistor R4. The control voltage is ap-
plied on resistor R5.
Figure 6. Line Oscillator
7/14
TEA2037A
Figure 7. Phase ComparatorThe sync-pulse drives the current in the compara-
tor. The line flyback integrated by the external net-
work gives on pin 11 a saw tooth, the DC offset of
this saw tooth is fixed by VC. The comparator out-
put provides a positive current for the part of the
signal on pin 11 greater than to VC and a negative
current for the other part.When the line flyback and
the video signal are synchronized, the output of
the comparator is an alternatively negative and
positive current. The frame sync-pulse inhibits the
comparator to prevent frequency drift of the line
oscillator on the frame beginning.
Figure 8.
