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参数资料
| 型号： | FA5500P |
| 厂商： | FUJI ELECTRIC CO LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, PDIP8 |
| 封装： | DIP-8 |
| 文件页数： | 13/26页 |
| 文件大小： | 305K |
| 代理商： | FA5500P |
FA5500P/N, FA5501P/N
20
Quality is our message
(1-3)
Designing auxiliary winding of L1
The auxiliary winding typically has two functions:
-Detecting that inductor current reaches zero
-Supplying Vcc voltage of IC
To achieve these functions, you have to determine a
proper ratio of it to the main winding.
The voltage of auxiliary winding always changes
according to each instantaneous voltage of AC line. The
outline of the auxiliary winding voltage is shown in Fig.
14.
auxilliary winding
voltage
Np
Ns
)
Vac
2
Vo
(
×
Np
Ns
Vo
×
Np
Ns
Vac
2
×
1/2 of line frequency
0
envelope
Fig.14
Auxiliary winding voltage
The following conditions should be satisfied based on
this various voltage.
ZCD Threshold Voltage
The threshold voltage of ZCD comparator is
1.87V(max.) when ZCD pin voltage rises. It is
necessary for the minimum voltage of auxiliary winding
to exceed this threshold voltage. Therefore, the
following condition must be satisfied.
()
.
max
Vac
2
Vo
1.87
Np
/
Ns
×
>
Vcc voltage
The following condition must be satisfied, so that Vcc
voltage will be set between 12V and 28V according to
the recommended condition.
Vo
28
Ns/Np
Vo
12
<
The turns ratio Ns/Np must satisfy both two condition.
If the boost voltage ratio of PFC (the ratio of Vo to
Vac) is too small, the turns ratio can not satisfy both
condition. This problem can be solved with following
methods.
-Attach two auxiliary windings for both ZCD and Vcc
respectively.
-Set ZCD condition preceding Vcc condition. In this
case, there is possibility for Vcc to exceed the
recommended conditions. Therefore, clamp the Vcc
with internal ZD or additional ZD (Fig. 15). In this
case, a resistance for current limit (R11) is needed
between the auxiliary winding and Vcc pin. In
addition, especially when using internal ZD, mind
that “Total power supply and zener current” and
“Power dissipation” must not exceed the absolute
maximum rating value.
D2
R11
C5
sub
VCC
8
internal
ZD
using internal ZD
D2
R11
C5
sub
VCC
8
external
ZD
using external ZD
Fig.15
Vcc clamp circuit
(1-4)
ZCD pin circuit
The auxiliary winding voltage is monitored by ZCD
pin in order to detect that the inductor current reaches
zero. A resistor for current limit (R5) is connected
between ZCD pin and the auxiliary winding because of
rating current of ZCD pin. The most appropriate value of
R5 is determined by evaluating in the actual circuit. In
calculation, the value of R5 is assumed by the following
equation so that the ZCD pin current (Idet) will be about
±3.0mA, which is test condition of characteristics.
For lower clamp
3
10
3
Np
Ns
.)
Vac(max
2
0.6
5
R
×
+
>
For upper clamp
3
10
3
5.7
Np
Ns
Vo
5
R
×
×
>
The minimum value, which satisfies both conditions, is
selected temporarily.
5
ZCD
R5
L1
D1
Q1
Rs
Fig.16
ZCD pin circuit
In actual circuit, the value of R5 also influences
MOSFET switching.
MOSFET(Q1) turns on when the current of inductor
L1 reaches zero. Just before turning on, the drain
voltage of MOSFET (Vds) begins sinusoidal oscillation
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