TEA2037 Просмотр технического описания (PDF) - STMicroelectronics
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TEA2037 Datasheet PDF : 9 Pages
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TEA2037A
ELECTRICAL CHARACTERISTICS (Tamb = 25oC) (continued)
Symbol
Parameter
FRAME OUTPUT (PIn 8)
LV8A
LV8B
HV8A
HV8B
FV8A
FV8B
Saturation Voltage to Ground (V7 = 30V)
I8 = 0.1
I8 = 1A
Saturation Voltage to V7 (V7 = 30V)
I8 = -0.1
I8 = -1A
Saturation Voltage to V7 in Flyback Mode (V8 > V7)
I8 = 0.1
I8 = 1A
FLYBACK GENERATOR (Pins 2 and 3)
F2DA
F2DB
FSVA
FSVB
FCI
Flyback Transistor on (output = high state) (V2 = 30V)
V3/2 with I3 → 2 = 0.1A
I3 → 2 = 1A
V2/3 with I3 → 2 = 0.1
I3 → 2 = 1A
Flyback Transistor off (output = V7 - 8V) (V7 = V2 = 30V)
Leakage Current Pin 2
Min. Typ. Max. Unit
0.0.6 0.6
V
0.37
1
V
1.3
1.6
V
1.7
2.4
V
1.6
2.1
V
2.5
4.5
V
1.5
2.1
V
3.0
4.5
V
0.8
1.1
V
2.2
4.5
V
170
µA
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 phasedetectorand 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 capaci-
tor by a 2 x 1 current. A line sync-pulse is not able
to discharge the capacitor underVZ/2. Aframe sync
pulse permits the complete discharge of the ca-
pacitor, so during the frame sync-pulse Q3 and Q4
provide current for the other parts of the circuit.
Figure 2 : Frame Separator
VZ
Figure 1 : Synchronization Separator Circuit
Q3
Q4
Video
VR
R1 15
SL1 SL2
R2
I
3I
SL1
ST1 ST2
VZ/2
The oscillator thresholds are internally fixed by
resistors. The discharge of the capacitor depends
on the internal resistor R4. The control voltage is
applied on resistor R5.
4/9
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