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參數(shù)資料
| 型號： | TDA9109S |
| 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)： | 24/30頁 |
| 文件大小： | 266K |
| 代理商： | TDA9109S |
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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.
ThisDC/DC converter must be configuredin step-
up mode. It operates very similarly to the well
known UC3842.
OPERATINGDESCRIPTION
(continued)
IV.1- Step-upMode
Operating Description
- The power MOS is switched-on at the middle of
the horizontalflyback.
- 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 either from the EHV or
from the flyback) is divided to a voltage close to
4.8Vandcomparedtothe internal4.8Vreference
(I
VREF
). The difference is amplified by an error
amplifier, the output of which controls the power
MOS switch-off current.
Main Features
- Switching synchronized on the horizontal fre-
quency,
- B+ voltagealways higher than the DC source,
- Current limitedon a pulse-by-pulsebasis.
The DC/DC converteris disabled:
- when V
CC
or V
DD
are too low,
- when X-Rayprotectionis latched,
- directly through I
2
C bus.
Whendisabled,BOUTisdriventoGNDbya 0.5mA
current source. This feature allows to implement
externallya softstart circuit.
16
14
15
V
B+
L
+
C3
C2
1/3
Σ
S
R
Q
400ns
Inhibit SMPS
28
12V
BOUT
I
SENSE
COMP
REGIN
95dB
A
±
I
adjust
DAC
7bits
I
2
C
TDA9109/SN
1M
22k
1.2V
1.2V
4.8V
±
20%
8V
Inhibit
SMPSSoft
Start
9
Figure 17 :
DC/DCConverter
TDA9109/SN
24/30
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| TDA9109SN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
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| TDA9112 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
| TDA9112A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH-END I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
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