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2-5 pins Function and Description
1) Vin terminal (9 PIN), start circuit
The start circuit perform the operation start and stop of
control IC by voltage of VIN terminal (9 PIN).
In power is start, if the Vin terminal voltage reaches to
8V(TYP) by charged in C6(A) through the start resistor, the
control circuit operates and voltage generates to each of
the trans wire wound. The control circuit gain the power of
Vin terminal by rectify d1, d2 TRANS WIRE VOUND after
operation.
In time of ST-BY, supply the voltage of TRANS WIRE wound
d2 to Vin terminal(B) through the Regulator which composed
of TR3 and D3. And in NORMAL (POWER ON), supply power
to Vin terminal (line C) through the Diode(D2) at TRANS wire
wound d1.
The VIN (9 PIN) start voltage is 8V, and operating stop
voltage is 5.1V(TYP). And, Vovp (Over voltage protect)
voltage is 10V(TYP).
2) F/B Terminal (PIN7) and Oscillator
• The oscillator generates the pulse signal so that let
Power Transistor ON/OFF by use of the include STR-
S6709 condenser C1, C2 charge or discharge time.
• Input voltage regulator control signal which control the
2nd output voltage through Photo Coupler (7 PIN). And,
control charge time of internal condenser C1, adjust the
ON time of power Transistor.
3) INH Terminal (Pin 8) Function (OFF time control)
• Energy out time of 2nd trans control the POWER
TRANSISTOR OFF time.
• INH Terminal (Pin 8) input voltage input to comparator1
(VTH: 0.75V) comparator 2 (VTH: 1.5V) comparator
3(VTH: 5.1V) which have each of VTH in IC. And
comparator 1,2 control off time and comparator 3
perform the Latch protect function operation.
INH Terminal
Oscillator output
C
1
C
2
PTR
OFF ON
In case that F/B and INH signal
by don't exist (Operate by IC
self oscillate time constant).
<Figure 2-d> Oscillator and OSC output waveform
Vin
Start
S
<Figure 2-c> Oscillator and F/B INH composition
Ton
In case that
In case that F/B INH signal
only F/B signal
exist. (in SET normal operation)
exist. Changed
Ton, Toff.
only Ton.
- 26 -
A
Rs
Tr3
D1
B
D2
1
9
VIN
C6
D3
2
GND
<Figure 2-a> starting circuit
Vd2
ST-by
<Figure 2-b> starting circuit
3
LACH
2
OSC
R
1
1
7
C
1
C
2
R
2
V
TH
2
V
TH
1
p
d2
d1
d1 wire wound
normal
d
2
R
INH
d
1
8
C
INH
2
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