Horizontal Drive And Power Supply Output - NEC MultiSync 75F-3 Service Manual

4.

Horizontal drive and power supply output

Circuit Diagram
Description of the circuit:
VCC
R1
T1
Q2
1) R1, T1 and Q2 compose the horizontal driving circuit, and the transistor Q1 generates a horizontal
output through the driving signal.
IB1 = I
I ¡Ü ¡Ü
¡Ü
¡Ü ¡Ü
B2
di/dt ¡Ü
2) The resistor R2 corrects the current IB1, the resistor R3 works as a damping resistor and leak
resistor, and the diode D2 works as a discharging device and polar body.
As long as the transistor Q1 is OFF, the discharge is accelerated and the storage time (Tstg) is
shortened.
3)H-OUT circuit waveform
R2
Q1
D2
R3
/ Q1h
CPMAX feMIN
3I
B1
3.3 A/
¡Ü
¡Ü
¡Ü ¡Ü
US
DR
CT
D1
CS
B+
69
+
C2