NTE1888 데이터 시트보기 (PDF) - NTE Electronics

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NTE1888

Integrated Circuit Horizontal and Vertical Deflection Monitor

NTE Electronics 

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

Flyback Mode

FV8A

FV8B

V8 > V7, I8 = 0.1A

V8 > V7, I8 = 1A

– 1.6 2.1 V

– 2.5 4.5 V

Flyback Transistor ON

(Output = High State)

F2DA

@ Pin2 V2/3 with I3 →2 = 0.1A

– 1.5 2.1

V

F2DB

& Pin3,

V2 = 30V

V2/3 with I3 →2 = 1A

– 3.0 4.5 V

FSVA

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 V7 = V2 = 30V,

–

– 170 µA

& Pin3 Leakage Current Pin2

Note 1. Frame Period Ratio = FFP

Application Notes:

MFP

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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