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參數(shù)資料
| 型號： | HA16148PS |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | AC/DC Switching Converter Controller IC With High-Voltage Power MOS FET |
| 中文描述： | AC / DC開關(guān)變換器控制IC與高壓電源MOS FET |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 113K |
| 代理商： | HA16148PS |
HA16148PS
15
Application Circuit Examples 1
The application circuit example shown here detects the secondary-side output voltage of a flyback power
supply. Secondary-side output voltage detection and feedback are performed by a shunt regulator and
photocoupler.
When the OVP latch function is used for secondary-side output voltage overvoltage protection, the FB pin
should be pulled up to VDD by the shunt regulator and photocoupler.
+
AC
INPUT
Line Filter
0.1
μ
100
μ
400V
560
μ
25V
15
μ
VR
260V
SBD
HRW26F
2200p
51k
P
S
HA16148PS
+
180
μ
25V
K
A
B
+
R3
330
OVP detection circuit (7.4V)
OVP feedback circuit
R4
1.8k
C4
0.022
μ
REF
HA17431VP
R6
4.7k
R7
2.4k
R2
150k
R1
120k
R5
3.3k
K
A
R8
330
R9
1.8k
C5
3.3
μ
REF
HA17431VP
R11
2.4k
DC
OUTPUT
5V/2A
R12
2.4k
Photo
coupler
R10
3.3k
+
C2
0.47
μ
C3
220p
C1
1
μ
20V
VR
15V
DRAIN
VDD
FB
SOURCE
SGND
CT
COMP
1
3
4
8
7
6
5
C6
0.1
μ
+
: Primary GND
*
VOUT(reg) = Vref(shunt)
×
R11 + R12
R12
: Secondary GND
Transformer
P: 90T / 1.43mH
S: 6T / 8.1
μ
H
B: 14T / 30.8
μ
H
= 2.5V
×
= 5.0V
2.4k
+ 2.4k
2.4k
VOUT(ovp) = Vref(shunt)
×
R6 + R7
R7
= 2.5V
×
= 7.4V
4.7k
+ 2.4k
2.4k
Units R:
C: F
The secondary-side output voltage is stabilized at a
value determined by the bleeder resistance of the
secondary-side shunt regulator.
When the OVP latch function is used, the secondary-side
voltage is detected by the shunt regulator, and feedback
to the FB pin is performed by the photocoupler. The OVP
detection level is determined by the following formula.
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