Application Hints; Dc-Coupled Application - Qls 21F1 Service Manual

STV8172A
4

Application Hints

The yoke can be coupled either in AC or DC.
4.1

DC-coupled Application

When DC coupled (see
the other hand, 2 supply sources (V
A Stand-by state will be reached by switching OFF the positive supply alone. In this state, where
both inputs are the same voltage as pin 2 or higher, the output will sink negligible current from the
deviation coil.
470μF
Vref
Vertical Position
Adjustment
R3
V
M
V
m
(*) recommended:
4.1.1 Application Hints
For calculations, treat the IC as an op-amp, where the feedback loop maintains V
Figure 4), the display vertical position can be adjusted with input bias. On
and -V
S EE
Figure 4: DC-coupled Application
C (47 to 100μF)
0.1μF F
6 3
Power
Amplifier
7
+
1
-
Thermal
Safety
4
-V
EE
470μF
Ly Ly
------------- < Rd < -------------
50ms 20ms
) are required.
+Vs
2
Flyback
Generator
5
0.1μF
STMicroelectronics Confidential
Application Hints
Output
Voltage
Output
Current
I
p
Yoke
1.5W Rd(*)
Ly
R2
R1
= V .
1 7
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