ETC AN5790N/AN5792

ICs for TV
AN5790N, AN5792
Horizontal Signal Processing ICs for CRT Display
■ Overview
AN5790N
Unit : mm
The AN5790N and AN5792 are the intergrated circuits
designed for CRT display horizontal signal processing circuits.
3.5±0.25
1.2±0.25
7.9±0.3
29.4±0.3
• Horizontal synchronous signal is available in both polarities.
• Wide range of horizontal osciallation frequency : 14kHz
2.54
■ Features
0.5±0.1
1.2±0.25
12
11
10
9
8
7
6
5
4
3
2
1
to 60kHz.
• Output pulse width : 2µs to 40µs
• Package
AN5790N...NF-12S(12-Pin SIL plastic package)
AN5792...F-12S (12-Pin SIL plastic package with fin)
0.1
0.45 –+ 0.05
1.7±0.25
1.7±0.25
12-Pin SIL Plastic Package (12-SIP)
AN5792
Unit : mm
29.4±0.3
0.5±0.1
1.2±0.25
2.54
28.0±0.3
5
4
3
2
1
1.7±0.25
12
11
10
9
8
7
6
3.5±0.25
1.2±0.25
0.1
0.45 –+ 0.05
7.9±0.3
ø3.3
5.8±0.25
1.7±0.25
12-Pin SIL Plastic Package with Fin (12-SIF (f))
■ Block Diagram
VCC
6
1
2
3
5
Polarity
Switch
X-ray
Protector
Pre-Amp.
8
AFC
Hor. Osc.
PulseWidth
Adjustment
7
4
12
11
9
10
GND
ICs for TV
AN5790N, AN5792
■ Absolute Maximum Ratings (Ta= 25˚C)
Symbol
Rating
Supply voltage
Parameter
VCC
13.2
Supply current
ICC
50
mA
mW
V
PD
1140
Operating ambient temperature
Topr
– 20 to +70
˚C
Storage temperature
Tstg
– 40 to +150
˚C
Power dissipation
Temperature
Unit
■ Electrical Characteristics (Ta= 25˚C)
Parameter
Symbol
Condition
min
Total circuit current
Itot
VCC=11V
Polarity switching voltage (1)
V2-7
Positive polarity signal input
Polarity switching voltage (2)
V2-7
Horizonal oscillation start voltage
VOSC-S (H)
30
mA
0.4
V
Negative polarity signal input
2.5
5.5
fHO=12kHz to 19kHz
7.5
fHO (1)
VCC=11V, C= 4400pF
15
fHO (2)
VCC=11V, C= 820pF, 5600pF
14
fHO supply voltage dependency
∆fHO/VCC
fHO=15.75kHz, fHO | 9.9V– fHC | 12.1V
fHO ambient temperature dependency
∆fHO/Ta
fHO=15.75kHz, fHO | –20˚C – fHC | 60˚C
Oscillation frequency control sensitivity
β
kHz
60
kHz
40
130
Hz
260
Hz
16
17.6
19.3
Hz/µA
17.8
19.4
µ×β
15.75
700
Output pulse width
τ HO (1)
VCC=11V, R= 20kΩ, C= 6800pF
Output pulse width
τ HO (2)
VCC=11V, R=20kΩ, C=330pF, 18000pF
V
V
16.5
∆IO= ±25µA
fDC
Unit
0
Horizonal oscillation frequency
45
max
60
Horizonal oscillation frequency
DC loop gain
typ
2
Hz/µs
21.2
µs
40
µs
Output pulse width variation to supply voltage change
∆τ HO/VCC
VCC= 9.9V to 12.1V
5
%
Output pulse width variation to temeprature change
∆τ HO/Ta
VCC=11V, Ta= – 20˚C to + 60˚C
5
%
Oscillation output saturation voltage
V8-7
VCC=11V, V10-7=1V
2
Oscillation output drive current
I8-7
VCC=11V, V10-7=1V
300
X-ray protecting circuit operation start voltage
V6-7
VCC=11V
0.5
0.64
■ Application Circuit
6
+
+
–
–
VCC (11V)
+
–
4.7µF
33kΩ
5
0.033µF
0.015µF
4
3.3kΩ
FBK Pulse Input
3
220µF/16V
2
39pF
0.018µF
1
33µF/50V
AN5790N/AN5792
Hor. Sync. Signal
7
8
9
10
11
12
Output
20kΩ
27kΩ
2700pF
2700pF
(Styrol Cap.) (Mylar Film Cap.)
2.7kΩ
2kΩ
V
mA
0.75
V
ICs for TV
AN5790N, AN5792
■ Pin Descriptions
Pin No.
1
Pin name
Horizontal
synchronous
signal input pin
Typ. waveform
5V
0V
2
Polarity
discrimination
switching pin
3
Flyback pulse
input pin
4
AFC output pin
DC
5
Supply voltage
DC
6
X-ray protecting
circuit input pin
DC
GND
DC
7
DC
Description
Pin for inputting a horizontal synchronous signal.
Equivalent circuit
4kΩ
5V
2
3
5.9V
4
Result of AFC detection.
When a voltage of 0.75V or more is
applied, no horizonal output will
not be generated.
5V
1
Both polarities of an input signal of
Pin1 are made available by connecting this pin to GND or setting it to
OPEN
Flyback feedback pin.
The standard value of amplitude is
1.5Vpp.
4kΩ
6
200Ω
8
8
Horizontal drive
output pin
680Ω
Current when turned ON should be
used at 300mA or less.
2Ω
ICs for TV
AN5790N, AN5792
■ Pin Descriptions (cont.)
Pin No.
Pin name
Typ. waveform
Description
Equivalent circuit
10
9
Trigger input pin
The output pulse width can be
changed by the capacitance
between Pins9 and 10 and resistance berween Pin10 and VCC.
10
9
Pulse width
adjusting pin
1kΩ
11
Sawtooth wave
generating pin
12
Horizontal
oscillation circuit
reference voltage
Oscillation frequency can be
changed by the capacitor to be
connected to this pin.
DC
Oscillation frequency is changed by
the resistor between this pin and
GND.
11
12
3.3V
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2001 MAR