HA17384 Hitachi Semiconductor, HA17384 Datasheet - Page 25

• Manufacturer Part Number: HA17384
• Description: High Speed Current Mode PWM Control IC for Switching Power Supply
• Manufacturer: Hitachi Semiconductor

Application Circuit Example (2)
Bleeder resistor
(adjuster according
to the rating of the
Photocoupler)
Commercial
AC 100V
3300p
When the error
amplifier is not used
When the error amplifier is used
10k
R
C
2SA1029
T
T
OVP input
10k
150k
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Line filter
47k
Figure 13 Secondary Voltage Sensing Flyback Converter
470p
100p
HA17431
COMP
10k
COMP
FB
CS
R
1k
T
/C
HA17384H,
HA17385H
FB
CS
R
T
T
/C
T
Rectifier bridge diode
0.8mA
16.4V
1k
+
V
GND
OUT
Vref
IN
V
+
GND
OUT
IN
Vref
V
50V
10
IN
100
200V
141V
51
HRP32
2SK1567
(Operation Theory)
On the secondary side (S) of the flyback converter,
error amplification is carried out by a shunt
regulator and photocoupler.
The voltage of the backup coil (B) is not monitored,
which differs from the application example (1).
In addition, OVP operates on the secondary side
(S) using a photocoupler.
Refer to the application example (1) for the other
notes.
+
0.1
B
220k
1/4W
P
1
2W
SBD
HRP24
S
4.7k
+
1000
10V
1.8k
4.7k
Transformer specification
example
EI-22 type core
(H7C18
Gap length
lg = 0.3mm
Transformer coil example
P: 0.5¿80T/570 H
S: 0.5¿16T Bifiler/22 H
B: 0.2¿44T/170 H
B
Photocoupler
(for output control)
HA17431
3.3
+
330
06Z)
3.3k
DC
5V, 3A
OUTPUT
+
25