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TDA9105 Datasheet(PDF) 17 Page - STMicroelectronics

Part No. TDA9105
Description  DEFLECTION PROCESSOR FOR MULTISYNC MONITORS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TDA9105 Datasheet(HTML) 17 Page - STMicroelectronics

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H Osc
Sawtooth
H Drive
1.6V
4V
6.4V
0.75T
0.25T
Ts
Duty Cycle
Internally
Shaped Flyback
Flyback
The duty cycle of H-drive is adjustable between 30% and 50%.
Figure 13 : PLL2 Timing Diagram
20k
Q1
GND 0V
5
HFLY
400
Figure 14 : Flyback Input Electrical Diagram
OPERATING DESCRIPTION (continued)
PLL2
The PLL2 ensures a constant position of the
shaped flyback signal in comparison with the saw-
tooth of the VCO (see Figure 13).
The phase comparator of PLL2 is followed by a
charge pump with a
±0.5mA (typ.) output current.
The flyback input is composed of an NPN transistor.
This input has to be current driven.
The maximum recommanded input current is 2mA
(see Figures 14 and 15).
C Lockdet
LOCKDET
COMP1
INPUT
INTERFACE
CHARGE
PUMP
PLL
INHIBITION
VCO
PHASE
ADJUST
PLL1INHIB
Horizontal
Adjust
R0 C0
Filter
High
Low
E2
3.2V
OSC
COMP2
CHARGE
PUMP
High
Low
RAP
CYC
EN
Adjust
Rapcyc
Cap
PHi2
PWM
LOGI
PWM
BUFFER
FLYBACK
SortCOLL
Flyback
SortEM
VB
VA
Horizontal
Input
13
14
12
11 10
17
43
15
5
21
20
HLOCKOUT
2
4V
Figure 15 : Dual PLL Block Diagram
TDA9105
17/32


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