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參數(shù)資料
| 型號： | LC5521D |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7 |
| 封裝： | DIP-8/7 |
| 文件頁數(shù)： | 28/40頁 |
| 文件大小： | 888K |
| 代理商： | LC5521D |
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34
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
28106.02
1. The overcurrent detecting drain peak current, IDP, without
the input compensation circuit, is expressed by the following,
based on equation 6, from figure 49, upper panel:
=
IDP
ROCP
VOCP + R3 × IOCP
(8)
2. On the other hand, the overcurrent detecting drain peak cur-
rent, I'DP, with the input compensation circuit, is expressed
by the following, based on equation 7, from figure. 49, lower
panel:
=
I 'DP
ROCP
VOCP + R3 × (IOCP – I )
(9)
Here, I'DP is the drain peak current where the output power
of the maximum AC input voltage becomes the same as that
limited by OCP at the minimum AC input voltage.
3. From equations 8 and 9, the compensation current, I, of the
input compensation circuit, is expressed as follows:
=
I DP – I 'DP
( I
DP – I 'DP )
I
–
ROCP
VOCP + R3 × (IOCP – I )
ROCP
VOCP + R3 × IOCP
=
× R
OCP / R
3
(10)
4. The forward voltage, Efw1 , at C2 peak voltage EIN(PK)(max) is
expressed as follows:
N
P
N
D × EIN(PK)(max)
=
E
fw1
(11)
5. Next, RX1 is expressed by the following, in order to let the
compensation current, I, flow at the maximum AC input volt-
age, EIN(PK)(max):
Efw1 – DZX1 – VFX1
RX1 + R3 + ROCP
=
I
(12)
assuming: R3, ROCP << RX1
I
Efw1 – DZX1 – VFX1
=
RX1
(13)
from equations 11 and 13:
–
I
(DZX1 + VFX1 )
=
NP
RX1
ND × EIN(PK)(max)
(14)
AC input compensation circuit design example with universal
input
Tentatively target the center point voltage between the minimum
AC input voltage and the middle of the universal input, where
the input compensation starts.
Decide IDP and I 'DP at both minimum and maximum AC input
voltage, when the output is set to the target value for both con-
ditions. For this, use the formula:
=
I'DP
D'ON× η1 × η2×VAC(min)
2√2× PO
(15)
In the case of using equation 15, enter minimum and maximum
AC input voltages as the parameter of VAC(min) and D'ON at
those voltages as the parameter of D'ON. Alternatively, measure
those drain currents using an actual power supply board.
Figure 49. Compensated drain current waveforms
R3
×
ROCP×IDP
R3 ×
IDP
Increase
Decrease
ROCP
IOCP
I
IOCP
× I
× IOCP
IDP
ID
IDP
×
R3 ×
ROCP×
R3
VOCP
R3
ROCP ×IDP
'
IDP
'
IDP
'
IDP
'
S/GND
OCP
ROCP
R3
RX1
ROCP
R3
S/GND
OCP
1(2)
With input
compensation
circuit
Without input
compensation
circuit
VOCP
3(5)
VOCP
IOCP
I
S/GND
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