TEA2029 STMICROELECTRONICS [STMicroelectronics], TEA2029 Datasheet - Page 37

• Manufacturer Part Number: TEA2029
• Description: APPLICATION NOTE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

VII - TEA2029 : DIFFERENCES WITH TEA2028
VII.1 - General
The TEA2029 has quite the same functions compared to TEA2028.
The main difference is that the TEA2029 incorporates a frame phase modulator intended to work with a
switched mode vertical stage using a thyristor.
The TEA2029 can also be used with a linear vertical power amplifier such as the TDA8170.
VII.2 - Pin by Pin Differences
VII.3 - TEA2029C Pin Connections
Pin
Pin
10
11
12
20
28
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
4
1
2
3
4
5
6
7
8
9
Dfferential inputs of the frame error amplifier (including
frame blanking safety in case of vertical stage failure).
Frame output for thyristor control
Horizontal output (26 s typ. duration)
Supersandcastle output (with a frame blanking duration
of 24 lines)
Negative horizontal flyback input (115 V
k
Positive AGC key pulse output (low level when no video) Capacitor for frame sync. time constant adjustment
Safety input (inhibition of SMPS, Horizontal and Frame
outputs when V
Frame error amplifier non-inverting input
Frame error amplifier inverting input
Frame saw-tooth output
Frame output (for thyristor control)
Frame ramp generator
Power Ground
SMPS control output
VCC Supply voltage
SMPS regulation input
Horizontal output
Supersandcastle output
Horizontal flyback input
Horizontal saw-tooth generator
Current reference
SMPS soft-start and safety time constant
(and horizontal phase adjustment)
VCO phase shift network
VCO output
VCO input
AGC key pulse output
Substrate Ground
VCR switching input
Video and 50/60Hz identification output (Mute)
Video identification capacitor
Horizontal sync detection capacitor
(50% of peak to peak sync level)
Video input
Safety input
2 phase comparator capacitor
1 phase comparator capacitor
resistor)
28
Description
> 1.26V)
TEA2029C
PP
through a 47
Package : DIP28
VII.4 - Frame Phase Modulator
The Tranconductance Amplifier ”A1” converts the
differential input voltage into two output currents
”I
- A1 transconductance =
- B transconductance =
- Transfer characteristic =
The filter time constant is maximum near the oper-
ating point when I
In this case :
- The base current of T
- The filter band-pass = 15kHz
The maximum conduction period of ”40 s” is de-
termined by the horizontal logic circuitry.
The frame frame flyback is detected by transis-
tor ”T ”.
There is no feed-back during frame flyback and
”I
the ”T3” into conduction.
TEA2028 - TEA2029 APPLICATION NOTE
S1
S3
Capacitor for horizontal output duration adjustment
(29 s typ. with c1 = 3.3nF)
Vertical blanking safety input
Vertical blanking output (21 lines duration)
Horizontal output (duration is adjustable)
Supersandcastle output (with a frame blanking
duration of 21 lines)
positive horizontal flyback input (10V
47k
Safety input (inhibition of SMPS, Horizontal outputs
when V
” and ”I
” is maximum (higher than I
resistor)
28
S3
< 1.26V)
”.
S1
TEA2028B
I
1
S2
I
V
= ”I
S2
V
I
2
S1
IN
= 40 A/V
t
S2
V
OUT
= 10 A/mV
IN
- I
4
S1
) which will drive
= 6.4 s/V
”
pp
through a
37/46