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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 18/28頁(yè) |
| 文件大?。?/td> | 301K |
| 代理商： | AN8027 |
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AN8027, AN8037
Voltage Regulators
18
I
Application Notes (continued)
[1] Operation descriptions (continued)
8. Bottom-on function (AN8037 only) (continued)
Select the constants of R9 and C9 to determine the turn-on delay time so that the power MOSFET will be turned
on at a frequency of half the resonant frequency. Practically, refer to figure 12 and determine the turn-on delay
time so that the power MOSFET will be turned on at V
DS
=
0 V. The approximate resonant frequency can be obtained
from the following formula.
1
[Hz]
2
π
√
L · C
L: inductance of primary winding of transformer
The turn-on delay time t
pd(ON)
to turn on the power MOSFET at a frequency of half the resonant frequency is,
therefore, as follows.
t
pd(ON)
=
π
√
L · C [s]
Note that since insertion of the resonance capacitor results in increased losses, using the parasitic capacitance
of the power MOSFET itself should also be considered. However, in this case the sample-to-sample variations
and temperature variations should be considered.
f
SYNC
=
C: resonant capacitance
9. Notes on R9 and C9 value selection
If an excessively low value is used for R9, the current flowing into the TR pin after power supply startup will
exceed the maximum rating for the IC, and incorrect operation (in the worst case, destruction of the device) may
occur. We recommend using a value of R9 in the range that satisfies the following conditions.
V
B(
)
The TR lower limit clamp voltage (
0.15 V typical)
≥
3 mA
R9
V
B(
)
: negative peak voltage
V
B(
+
)
The TR upper limit clamp voltage (1.5 V typical)
≤
3 mA
R9
V
B(
+
)
: positive peak voltage
Adjust t
PD(ON)
with C9 by taking the inductance and resonant capacitance of the transformer into consideration.
t
pd
V
P
V
IN
V
DS
0 V
0 V
0 V
0.25 V
V
TR
I
D
V
TR
0.7 V typ.
Figure 14
Figure 13
C8
C9
C7
R7
I
D
SBD
SBD
R9 V
B
V
P
V
CC
Out
6
1
7
TR
V
IN
Rectified AC
R1
To AC
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