TDA1675A STMicroelectronics, TDA1675A Datasheet - Page 8

• Manufacturer Part Number: TDA1675A
• Description: Video ICs Vertical Deflection
• Manufacturer: STMicroelectronics
• Type: Vertical Deflection Circuitr

Specifications of TDA1675A

• Maximum Operating Temperature: + 150 C
• Package / Case: MULTIWATT V
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA1675A
Figure 6 : PC Board and Components Layout for the Application Circuits of Figures 3, 4 and 5 (1 : 1 scale)
APPLICATION INFORMATION (Refer to the
block diagram)
Oscillator and sync gate (Clock generation)
The oscillator is obtained by means of an integrator
driven by a two threshold circuit that switches R
high or low so allowing the charge or the discharge
of C
The Sync input pulse at the Sync gate lowers the
level of the upper threshold and than it controls the
period duration. A clock pulse is generated.
Pin 4
8/11
o
under constant current conditions.
is the inverting input of the amplifier used
as integrator.
S1
R9
R12
RT1
C6
R1
C7
R 2
GND
C1
R o
C o
D1
C5
SYNC.
C4
IN
C9
TEST
TDA 1675A
Iy
o
R7
R6
R4
YOKE
Pin 6
Pin 3
Pin 5
Ramp generator and buffer stage
A current mirror, the current intensity of which can
be externally adjusted, charges one capacitor
producing a linear voltage ramp.
The internal clock pulse stops the increasing ramp
by a very fast discharge of the capacitor a new
voltage ramp is immediately allowed.
R11
R5
R8
C11
V
is the output of the switch driven by the
internal clock pulse generated by the
threshold circuits.
is the output of the amplifier.
is the input for sync pulses (positive)
S
BLANK
OUT
R3
C8
RT2
R10
GND
C3
C2