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參數(shù)資料
| 型號： | AN8027 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | AC-DC switching power supply control IC with standby mode |
| 中文描述： | 1 A SWITCHING CONTROLLER, 80 kHz SWITCHING FREQ-MAX, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁數(shù)： | 9/28頁 |
| 文件大小： | 301K |
| 代理商： | AN8027 |
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9
Voltage Regulators
AN8027, AN8037
I
Application Notes (continued)
[1] Operation descriptions (continued)
2.
Oscillation circuit (continued)
Setting the off-period
The minimum off-period is the charge period from V
L-CF
=
0.2 V (typical) to V
TH(OFF)
or V
FB
.
An approximate minimum off-period of the power MOSFET is obtained from the following formula.
Refer to figure 3.
T
OFF(min)
=
C
CF
×
V
TH(OFF)
/I
OFF1
(I
FB
≤
0.6 mA)
=
{C
CF
×
V
TH(OFF)
/ I
OFF1
}
+
{C
CF
×
(V
FB
V
TH(OFF)
) / I
OFF2
}
V
TH(OFF)
=
2.4 V typ.
I
OFF1
=
660
μ
A typ.
I
OFF2
=
160
μ
A typ.
T
OFF(min)
: Minimum off-period
C
CF
: Value of a capacitor connected to the CF pin
V
FB
: Voltage internally converted from feedback signal I
FB
V
TH(OFF)
: Threshold voltage of V
FB
to extend off-period
I
OFF1
: Charge current until CF pin voltage increases from 0.2 V to 2.4 V
I
OFF2
: Charge current until CF pin voltage increases from 2.4 V to V
FB
(I
FB
>
0.6 mA)
When the IC is in local resonance operation, the off-period is determined by the longer one of either the
time required for the input voltage on the TR pin to drop below the threshold voltage or the minimum off-
period (T
OFF(min)
) specified by the C
CF
.
Thus the power MOSFET is in continuous on/off operation.
AN8027, AN8037
I
OFF
=
660
μ
A typ.
(I
FB
<
0.6 mA)
I
OFF
=
160
μ
A typ.
(I
FB
>
0.6 mA)
V
CC
I
OFF
V
FB
FB
PC
C
CF
C
E
IN
+
NP
NB
Out
GND
Current mirror
1 : 5
20 k
CF pin voltage
Out pin voltage
V
H
CF
=
4 V
V
TH(OFF)
=
2.4 V
V
L2
CF
=
0.2 V
V
CC
1.5 V
0 V
V
FB
0 V
Figure 3. Off-period block diagram and control waveform
CF pin voltage
Out pin voltage
On
T
OFF(min)
T
OFF
I
FB
<
0.6 mA
V
H
CF
=
4V
V
TH(OFF)
=
2.4 V
V
L2
CF
=
0.2 V
V
CC
1.5 V
0 V
V
FB
0 V
On
T
OFF(min)
T
OFF
I
FB
>
0.6 mA
I
FB
; large
T
OFF(min)
; large
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相關代理商/技術參數(shù) |
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|---|---|
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