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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 |
| 文件頁數(shù)： | 17/28頁 |
| 文件大小： | 301K |
| 代理商： | AN8027 |
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17
Voltage Regulators
AN8027, AN8037
I
Application Notes (continued)
[1] Operation descriptions (continued)
7. Local resonance operation (power MOSFET turn-on delay circuit) (continued)
Input voltage; Low
Figure 12
t
pd
V
P
V
IN
V
DS
V
DS
0 V
0 V
0 V
0.25 V
V
TR
I
D
V
TR
0.7 V typ.
Input voltage; High
t
pd
V
P
V
IN
0 V
0 V
0 V
0.25 V
V
TR
I
D
V
TR
0.7 V typ.
Transformer resetting
detected on falling edge.
Bottom-on function (AN8037 only)
A one-shot pulse is generated at the moment the signal level on the TR pin switched
to low level from high level reaches 0.25 V (typical) after the turn-on signal is received.
Refer to the next section for details.
Figure 11
AN8027, AN8037
Not acceptable during
T
ON
and T
OFF(min)
periods.
Lower limit clamp
0.15 V typ.
Transformer resetting
comparator
Upper limit clamp
0.7 V typ.
Adjust so that the
current will be
±
3 mA.
Lower limit
clamp current
One shot
(AN8037 only)
0.25 V typ.
NB
D
B
R
TR
V
CC
GND
TR
Upper limit clamp current
8. Bottom-on function (AN8037 only)
Unlike the AN8027 or our conventional AN8026, AN8028, or AN8029 IC, which detects transformer resetting
with the high or low level in comparison to the threshold voltage on the TR pin, the AN8037 detects transformer
resetting on the falling edge across the threshold voltage.
This ensures the reliable local resonance operation of the IC regardless of input voltage fluctuations in a wide
input range for worldwide use, thus eliminating difficulty in turning on the power MOSFET when V
DS
is close to
the minimum value. Refer to figure 12.
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| AN8028 | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC |
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| AN8031 | 制造商:PANASONIC 制造商全稱:Panasonic Semiconductor 功能描述:Active filter control IC |
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