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參數(shù)資料
| 型號(hào)： | TDA9109/S |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 偏轉(zhuǎn) |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封裝： | SHRINK, PLASTIC, DIP-32 |
| 文件頁(yè)數(shù)： | 17/30頁(yè) |
| 文件大?。?/td> | 293K |
| 代理商： | TDA9109/S |
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IV - DC/DC CONVERTER PART
OPERATING DESCRIPTION (continued)
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) necessary for the horizontal scanning.
ThisDC/DC converter must be configured in step-
up mode. It operates very similarly to the well
known UC3842.
IV.1 - Step-up Mode
Operating Description
- The power MOS is switched-on at the middle of
the horizontal flyback.
- The power MOS is switched-off when its current
reaches a predetermined value. For this purpose,
a sense resistor is inserted in its source. The
voltage on this resistor is sent to Pin16 (ISENSE).
- The feedback (coming either from the EHV or
from the flyback) is divided to a voltage close to
4.8V and compared to the internal 4.8V reference
(IVREF). 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+ voltage always higher than the DC source,
- Current limited on a pulse-by-pulse basis.
The DC/DC converter is disabled :
- when VCC or VDD are too low,
- when X-Ray protection is latched,
- directly through I
2C bus.
When disabled, BOUT is driven to GND by a 0.5mA
current source. This feature allows to implement
externally a soft start circuit.
16
14
15
V
B+
L
+
C3
C2
1/3
S
R
Q
400ns
Inhibit SMPS
28
12V
BOUT
I
SENSE
COMP
REGIN
95dB
A
± I
adjust
DAC
7bits
I2C
TDA9109/S
1M
W
22k
W
1.2V
4.8V ±20%
8V
Inhibit
SMPS
Soft
Start
91
09
S
-3
7.
E
P
S
Figure 17 : DC/DC Converter
TDA9109/S
24/30
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