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參數(shù)資料
| 型號： | HA16138PS |
| 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)： | 16/20頁 |
| 文件大?。?/td> | 96K |
| 代理商： | HA16138PS |
HA16138PS
16
Application Circuit Examples 2
The application circuit example shown here detects the primary-side back-up output voltage of a flyback
power supply. As the back-up output voltage, VDD is resistance-divided and feedback is performed to the
FB pin. The back-up output voltage and secondary-side output voltage are proportional to the ratio of
transformer windings. Using this characteristic enables the system to be configured with simple circuitry
as shown in the figure below.
The VDD-to-FB feedback resistance can also be used as the back-up output voltage OVP detection
resistance.
+
AC
INPUT
Line Filter
0.1
μ
100
μ
400V
560
μ
25V
15
μ
VR
260V
SBD
HRW26F
2200p
51k
P
S
HA16138PS
+
180
μ
25V
B
+
R4
15k
R2
120k
R1
240k
DC
OUTPUT
5V/1A
+
C3
2200p
C2 0.1
μ
C4
220p
C1
47
μ
20V
VR
15V
DRAIN
DRAIN
VDD
FB
SOURCE
SGND
CT
COMP
1
2
3
4
8
7
6
5
R3 1M
+
: Primary GND
VDD(reg) = V
(+)EA
×
R1 + R2
R2
: Secondary GND
Transformer
P: 90T / 1.43mH
S: 6T / 8.1
μ
H
B: 14T / 30.8
μ
H
= 3.8V
×
= 11.4V
240k
+ 120k
120k
240k
+ 120k
120k
VDD(ovp) = Vovp
×
R1 + R2
R2
= 5.0V
×
= 15V
Units R:
C: F
* If feedback resistance R1 = 240 k
and R2 = 120 k
,
feedback is performed so that the FB pin voltage is
non-inverting input voltage V
(+)EA
, and the VDD voltage
is stabilized.
When the FB pin voltage reaches OVP latch set
voltage Vovp, the OVP latch circuit operates, shutting
down the IC. The VDD voltage in this case is given
by the following formula.
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