NTE 1788 Service Manual

NTE1788

Integrated Circuit

TV Vertical Deflection Output Circuit

Description:

The NTE1788 is a monolithic integrated circuit in 7−Lead Staggared SIP type package and is de­signed for use as a high efficiency power booster for direct driving of vertical windings of TV yokes.
It is intended for use in color and B & W television as well as in monitors and displays.

Features:

D Power Amplifier

D Flyback Generator

D Thermal Protection

Absolute Maximum Ratings:

Supply Voltage (Pin2), V
Flyback Peak Voltage, V5, V
Voltage at Pin3, V

3

Amplifier Input Voltage, V1, V
Output Peak Current, I

S

6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

O

(Non Repetitive, t = 2ms) −0.5A to +2.5A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(f = 50 or 60Hz, t ≤ 10µs) 3A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(f = 50 or 60Hz, t > 10µs) 2A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pin3 DC Current (V5 < V2), I

3

Pin3 Peak to Peak Flyback Current (f = 50 or 60Hz, t
Total Power Dissipation (TC = +90°C), P
Junction Temperature Range, T
Storage Temperature Range, T

J

stg

Thermal Resistance, Junction to Case, R

tot

Θ

JC

1.5ms), I

≤

fly

3

−40° to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

−40° to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

60V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+V
+V

100mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3A. . . . . . . . . . . . . . . . . . . . . . . .

20W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+3°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

S

S

Electrical Characteristics: (VS = 35V, TA = +25°C unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Quiescent Current I

Amplifier Input Bias Current I

Pin3 Saturation Voltage to GND V

Quiescent Output Voltage V

Output Saturation Voltage to GND V

Output Saturation Voltage to Supply V

Junction Temperature for Thermal

Shut Down

2

I

6

1

I3 = 0, I5 = 0 − 8 16 mA

I3 = 0, I5 = 0 − 16 36 mA

V1 = 1V, V7 = 2V − −0.1 −1.0 µA

V1 = 2V, V7 = 1V − −0.1 −1.0 µA

3L

5L

I3 = 20mA − 1.0 1.5 V

V5 = 35V, Ra = 39kΩ − 18 − V

5

I5 = 1.2A − 1.0 1.4 V

I5 = 0.7A − 0.7 1.0 V

5H

−I5 = 1.2A − 1.6 2.2 V

−I5 = 0.7A − 1.3 1.8 V

T

j

Pin Connection Diagram

(Front View)

Non−Inverting Input7

6

Output Stage Supply

5

Output

4

GND/Tab

3 Flyback Generator

2

V

CC

1 Inverting Input

− 140 − °C

.189 (4.8)

.410 (10.42)

.237
(6.0)

.622

.152 (3.93)
Dia

17

.300(7.62)

(15.8)

.666

(16.9)

.054 (1.38)

.890

(22.6)