HA17524 Hitachi Semiconductor, HA17524 Datasheet - Page 10

• Manufacturer Part Number: HA17524
• Description: Switching Regulator Controller
• Manufacturer: Hitachi Semiconductor

HA17524P/FP
Push Pull Switching Regulator: Figure 12 shows the circuit configuration of push-pull switching regulator
that uses transformer. This system is suited for high power. Output transistors inside HA17524 can drive
external switching transistors.
Note
Compared with conventional series regulators, switching regulators generate high frequency noise by
switching current quickly. To reduce noise
1. As a general rule, insert line filter to reduce noise at the input.
2. To reduce noise at the output:
3. When choosing external parts (external switching transistor, diode, coil, etc) consider their capacitance
10
a. Twist output wiring together.
b. Do not bundle power source and output wiring.
c. Insert capacitor should be inserted at the load side.
d. Ground the power frame.
and characteristics.
0.01 F
0.1 F
5k
5k
2k
5k
5k
INV.
Input
NON-INV.
Input
V
R
C
SHUT
DOWN
OSC Out
REF
T
T
GND
V
V
CC
CC
Figure 12 Push-Pull Switching Regulator
= 28V
COMP
CL(+)
CL(–)
C
C
E
E
1
1
2
2
1k
1W
0.001 F
20k
1k
1k
1k
1W
0.1
+
20T
20T
100 F
5T
5T
1,500 F
1mH
+
5V, 5A