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參數(shù)資料
| 型號(hào)： | AN8029 |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, PSIP9 |
| 封裝： | PLASTIC, SIP-9 |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 132K |
| 代理商： | AN8029 |
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11
Voltage Regulators
AN8029
I
Application Notes (continued)
[1] Operation descriptions (continued)
8. Timer latch (continued)
9. Output block
In order to drive the power MOSFET which is a capacitive load at high speed, this IC is adopting the totem pole
(push-pull) type output circuit which performs the sink and source of the current with the NPN transistor as shown
in figure 10.
The maximum sink/source current is
±
0.1 A (DC) and the current at peak is
±
1.0 A (Peak). The circuit is
provided with the sink capability even if the supply voltage V
CC
is under the stop voltage so that it turns off the
power MOSFET without fail.
The peak current capability is mainly required and a particularly too large current is not required constantly.
Because the power MOSFET becomes a capacitive load for the output, a large peak current is required for driving
it at a high speed. However, after the charge and discharge, a particularly large current is not required to keep such
condition. In the case of this IC, the peak current capability of
±
1 A is ensured by taking a capacitance value of
the power MOSFET used into account.
The parasitic LC of the power MOSFET may
produce ringing to decrease the output pin under
the GND potential. When the voltage decrease of
the output pin becomes larger than the voltage drop
of diode and its voltage becomes negative, the
parasitic diode consisting of the substrate and
collector of the output NPN turns on. This phe-
nomenon can cause the malfunction of device. In
such a case, the Schottky barrier diode should be
connected between the output and GND.
0
I
DS
Power MOSFET
current
0
V
OVP
OVP
V
TH
=
7.3 V (typ.)
Figure 10. Timer latch basic operation
TIM/OVP
terminal voltage
0
V
O
Power supply
output voltage
Time
Time
Time
Power supply stop
Power supply stop
Power supply stop
Schottky barrier
diode
Figure 11
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