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NTE1888 Datasheet(PDF) 3 Page - NTE Electronics

Part No. NTE1888
Description  Integrated Circuit Horizontal and Vertical Deflection Monitor
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Maker  NTE [NTE Electronics]
Homepage  http://www.nteinc.com
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NTE1888 Datasheet(HTML) 3 Page - NTE Electronics

   
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Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Current
I7
@ Pin7
V7 = 30V
22
mA
Operating Voltage
V2
@ Pin2
10
30
V
Saturation Voltage to GND
LV8A
@ Pin8
V7 = 80V, I8 = 0.1A
0.06
0.6
V
LV8B
V7 = 80V, I8 = 1A
0.37
1.0
V
Saturation Voltage to V7
HV8A
V7 = 30V, I8 = –0.1A
1.3
1.6
V
HV8B
V7 = 30V, I8 = –1A
1.7
2.4
V
Saturation Voltage to V7 in
FV8A
V8 > V7, I8 = 0.1A
1.6
2.1
V
Flyback Mode
FV8B
V8 > V7, I8 = 1A
2.5
4.5
V
Flyback Transistor ON
F2DA
@ Pin2
V2/3 with I3 2 = 0.1A
1.5
2.1
V
(Output = High State)
F2DB
& Pin3,
V = 30V
V2/3 with I3 2 = 1A
3.0
4.5
V
FSVA
V2 = 30V
V3/2 with I2 3 = 0.1A
0.8
1.1
V
FSVB
V3/2 with I2 3 = 0.1A
2.2
4.5
V
Flyback Transistor OFF
(Output = V7 – V8)
FCI
@ Pin2
& Pin3
V7 = V2 = 30V,
Leakage Current Pin2
170
µA
Note 1. Frame Period Ratio =
Application Notes:
The NTE1888 performs all the video and power functions required to provide signals for the direct
drive of the line darlington and frame yoke. It contains:
D A shunt regulator
D A synchronization separator
D An integrated frame separator without external components
D A saw–tooth generator for the frame
D A power amplifier for direct drive of frame yoke (short circuit protected)
D An open collector output for the line darlington drive
D A line phase detector and a voltage control oscillator
Synchronization Separator
The slice level of sync separation is fixed by the value of external resistors controlled by an
internally fixed voltage.
Frame Separator
The sync–pulse allows the discharge of the external capacitor by a 2 x I current. Capacitor
discharge is held by VZ/2, and a frame sync pulse permits the complete discharge of the capci-
tor to provide current for the other parts of the circuit.
Line Oscillator
The oscillator thresholds are internally fixed by resistors. The discharge of the capacitor de-
pends on a internal resistor.
Phase Comparator
The sync–pulse drives the current in the comparator. The line flyback integrated by the exter-
nal network gives a sawtooth on Pin11. The comparator output provides a positive current for
the part of the signal on Pin11 greater than VCC and a negative current for the other part. When
the line flyback and the video signal are synchronized, the output of the comparator is an alter-
natively negative and positive current. The frame sync–pulse inhibits the comparator to pre-
vent frequency drift of the line oscillator on the frame beginning.


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