Changhong Electric PF2939, Руководство по обслуживанию, Страница: 17 / 47

SERVICE MANUAL
TDA8350 (N401)
DC-coupled Vertical Deflection and East-West Output Circuit
1. Features
· High EMC immunity due to common mode
inputs
· Temperature (thermal) protection
· East-West output stage with one single
conversion resistor.
2. General Description
The TDA8350Q is a power circuit for use
in 90° and 110° colour deflection systems
for field frequencies of 50 to 120 Hz. The
circuit provides a DC driven vertical
deflection output circuit, operating as a
highly efficient class G system and an
East-West driver for sinking the diode
modulator current.
· Few external components
· Highly efficient fully DC-coupled vertical output
bridge circuit
· Vertical flyback switch
· Guard circuit
· Protection against ：
-short-circuit of the output pins
-short-circuit of the output pins to Vp
3. Block Diagram
+V
P
V
P
I
I(set)
I
I(corr)
I
I(set)
V
O(SINK)
V
FB
-V
O(B)
V
P
V
O(B)
V
I(FB)
+V
O(A)
V
O(A)
V
O(guard)
I
drive(neg)
I
drive(pos)
I
I(
s
e
t)
Fig. 8
4. Refer to Table 5 about Functions and Service Data of TDA8350Q’s Pins.
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