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STV9326 View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
STV9326 Vertical Deflection Booster for 3-APPTV/Monitor Applications with 60-V Flyback Generator ST-Microelectronics
STMicroelectronics ST-Microelectronics
STV9326 Datasheet PDF : 14 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Application Hints
STV9326
4.1.1.1 Centering
Display will be centered (null mean current in yoke) when voltage on pin 7 is (R1 is negligible):
V7
=
V-----M------+2-----V-----m---
×
-R----2---R--+--2---R-----3- ⎠⎟⎞
4.1.1.2 Peak Current
IP = (---V----M------2-----V----m------) × -R----1-R---x--2-R-----3-
Example: for Vm = 2 V, VM = 5 V and IP = 1 A
Choose R1 in the1 range, for instance R1=1
From equation of peak current:
RR-----23-- = -2--V--×---M--I--P--–----×-V---R-m----1- = 23--
Then choose R2 or R3. For instance, if R2 = 10 k, then R3 = 15 k
Finally, the bias voltage on pin 7 should be:
V7 = -V----M------+2-----V----m---- × 1-----+---1---RR---------32---- = -72-- × 2---1-.--5- = 1.4V
4.1.2
Ripple Rejection
When both ramp signal and bias are provided by the same driver IC, you can gain natural rejection
of any ripple caused by a voltage drop in the ground (see Figure 5), if you manage to apply the
same fraction of ripple voltage to both booster inputs. For that purpose, arrange an intermediate
point in the bias resistor bridge, such that (R8 / R7) = (R3 / R2), and connect the bias filtering
capacitor between the intermediate point and the local driver ground. Of course, R7 should be
connected to the booster reference point, which is the ground side of R1.
Figure 5: Ripple Rejection
Reference
Voltage
R9
Ramp
Signal
Driver
Ground
6
R8 00 00 00 00R7
Power
Amplifier
7+
1-
4
3
2
Flyback
Generator
5
Thermal
Safety
Rd
Yoke
Ly
R3
00 00
Source of Ripple
R2
R1
0000
6/14
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