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參數(shù)資料
| 型號： | TDA9109N |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| 中文描述： | 低費用偏轉(zhuǎn)處理器多同步監(jiān)測儀 |
| 文件頁數(shù)： | 24/32頁 |
| 文件大?。?/td> | 303K |
| 代理商： | TDA9109N |
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IV- DC/DC CONVERTER PART
This unit controls the switch-mode DC/DC con-
verter. It converts a DC constant voltage into the
B+ voltage (roughly proportional to the horizontal
frequency)necessaryfor thehorizontal scanning.
This DC/DC convertercan be configured either in
step-upor step-down mode. Inbothcases it oper-
ates very similarly to the well known UC3842.
OPERATINGDESCRIPTION
(continued)
IV.1- Step-upMode
Operating Description
- ThepowerMOSisswitched-onduringtheflyback
(at the beginning of the positive slope of the
horizontal focus sawtooth).
- The power MOS is switched-offwhen its current
reachesa predeterminedvalue.Forthispurpose,
a sense resistor is inserted in its source. The
voltage on this resistor is sent to Pin16 (I
SENSE
).
- The feedback(coming eitherfrom the EHV or from
theflyback)is dividedtoa voltagecloseto 4.8Vand
comparedtotheinternal4.8Vreference(I
VREF
).The
differenceisamplifiedbyanerroramplifier,theoutput
ofwhichcontrolsthepowerMOSswitch-offcurrent.
MainFeatures
- Switching synchronized on the horizontal fre-
quency,
- B+ voltagealways higher than the DC source,
- Currentlimited on a pulse-by-pulsebasis.
IV.2- Step-down Mode
In step-down mode, the Isense information is not
usedany moreandthereforenotsentto thePin16.
This mode is selected by connectingthis Pin16 to
a DC voltagehigher than6V (forexample V
REF-V
).
Figure 18 :
DC/DCConverter
OperatingDescription
- ThepowerMOSis switched-onas forthestep-up
mode.
- The feedbackto theerroramplifier is done as for
the step-up mode.
- The power MOS is switched-off when the
HFOCUSCAP voltage get higher than the error
amplifier output voltage.
Main Features
- Switching synchronized on the horizontal fre-
quency,
- B+ voltagealways lower than the DC source,
- No currentlimitation.
IV.3- Step-upandStep-downModeComparison
In step-down mode the control signal is inverted
compared withthe step-upmode.
The reason for this is the following:
- In step-upmode, the switch is a N-channelMOS
referencedto ground and made conductive by a
high level on its gate.
- In step-down, a high-side switch is necessary.It
can be either a P- or a N-channel MOS.
- ForaP-channelMOS,thegateiscontrolleddirectly
fromPin28throughacapacitor(thisallowstospare
aTransformer).Inthiscase,anegative-goingpulse
isneededtomaketheMOSconductive.Therefore
itisnecessarytoinvertthecontrolsignal.
- For a N-channelMOS,a transformeris needed
to control the gate. The polarity of the trans-
former can be easily adapted to the negative-
goingcontrol pulse.
16
14
15
V
B+
L
+
8V
6V
C4
C3
C2
1/3
Σ
C1
Horizontal Dynamic
Focus Sawtooth
down
up
S
R
Q
HDF Disc
400ns
down
up
Inhibit SMPS
28
12V
Command step-up/down
BOUT
I
SENSE
COMP
REGIN
95dB
A
±
I
adjust
DAC
7bits
I
2
C
TDA9109/N
1M
22k
1.2V
1.2V
4.8V
±
20%
8V
9
TDA9109/N
24/32
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