TDA9108 Ver la hoja de datos (PDF) - STMicroelectronics
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TDA9108 Datasheet PDF : 9 Pages
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TDA9108
ELECTRICAL CHARACTERISTICS (continued)
(refer to the test circuit, VS = 12V, TA = 25oC, unless otherwise specified)
Symbol
Parameter
HORIZONTAL SYNC. INPUT
V9SW Sync Input Threshold
I9SW Sync Input Current
SYNC POLARITY SELECTION
V10th Polarity Selection Threshold
Test conditions
q Sync high
q Sync Low
q Sync high
q Sync Low
Min.
2
-20
2.3
Positive sync on Pin 9 for V10 < V10th
Negative sync on Pin 9 for V10 > V10th
Typ.
-7
2.5
Max. Unit
VS
V
0.8
V
1
µA
µA
2.7
V
I10 Input Current
V10ZL Low Impedance (2kΩ) Threshold
V10 = 2V
V10 = 3V
(see note 1)
1
µA
12
µA
6.3
V
X-RAY PROTECTION CIRCUIT
V8th X-ray Prot Input Threshold Voltage
(when V8 > V8th Pin 2 and 3 are inhibited
until VS is switched off/on)
I8 Input Current
V8 ≤ 2.5
V8 ≥ 3.3
2.6
2.9
3.2
V
-0.5
µA
0.5
µA
FLYBACK INPUT
V6 Phase Comparator Input Threshold
I6 Input Switching Current
10
V
0.1
mA
OUTPUT PULSE
V2 Saturation Voltage (Pin 3 grounded)
I2 = 150mA
I2 Output Current (Pin 3 grounded)
V2 = 5V
V3 Output Voltage (Pin 2 connected to supply) q High level (I3 = 150mA) 8.8
q Low level (I3 = 100mA)
I3 Output Current Capability
q Source
q Sink
R3 Output Resistance
q At leading edge of
output pulse
q At falling edge of
output pulse
2.2
3.2
V
150 mA
9.8
10.8
V
1.5
2.7
V
150 mA
100 mA
3
Ω
20
Ω
DUTY CYCLE ADJUSTMENT
tp Horizontal Output Pulse Duty Cycle on
Pin 3 (high level, line transistor off time)
V4 Voltage on Pin 4 (see note 2)
R4 Serial Equivalent Resistor on Pin 4
(see note 2)
f = 31.5kHz
Pin 4 not connected
Pin 4 not connected
Pin 4 not connected
26
30
34
%
0.178 VS 0.19 VS 0.202 VS V
1.7
2.3
2.9
kΩ
Note 1 : The voltage on the polarity detection comparator is clamped by an internal Zener diode (VZ).
When
voltage
on
Pin
10
reaches
VZ,
then
IPIn
10
=
VPin 10 −
2kΩ
VZ .
VS
Note 2 : Pin 4 internal schematic
To Duty Cyc le
2kΩ
10
2.5V
Adj u stme nt
DZ
2.3kΩ
4
0.19 VS
3/9
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