SRP Hitachi Semiconductor, SRP Datasheet - Page 13

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

Power OFF
At power OFF, the input voltage of the transformer gradually decreases and then V
according to the input voltage. When V
UVL1 (UVL2) operates again and the PWM pulse stops.
Note: 2. The value is for the HA17384S/H.
(Ex: from photocoupler)
The value is 7.6 V for the HA17385H.
OVP input
Commercial AC voltage
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Figure 2 Mounting Circut Diagram for Operation Expression
Power switch
3300p
10k
R
C
T
T
150k
Line filter
V
CS
IN
330p
becomes lower than 10 V*
100p
20k
3.6k
COMP
FB
CS
R
T
/C
HA17384H,
HA17385H
Rectifier
bridge diode
T
V
IN
+
1k
GND
OUT
Vref
+
V
100
200V
50V
10
IN
C
B
+
51
HRP32
R
220k
1/4W
B
2
0.1
or Vref becomes lower than 4.7 V,
B
P
R
1
2W
Power MOSFET
ex. 2SK1567
CS
ex. HRP24
S
IN
SBD
of IC also decreases
Floating
ground
1000
10V
+
DC
output
+
13