an8022l Panasonic Corporation of North America, an8022l Datasheet - Page 13

• Manufacturer Part Number: an8022l
• Description: Ac-dc Switching Power Supply Control Ic
• Manufacturer: Panasonic Corporation of North America

Voltage Regulators
[2] Operation descriptions (continued)
6. Timer latch (continued)
7. Output Block
Application Notes (continued)
Power supply
output voltage
Power MOSFET
current
TIM/OVP
terminal
voltage
output circuit using the totem pole (push-pull)
method, by which sink/source of current is per-
formed with the NPN transistor as shown in figure
9, in order to drive the power MOSFET at high
speed.
(DC) and 1.0 A (peak). Even when the supply
voltage V
function works to ensure that the power MOSFET
be turned off.
normally: The power MOSFET which works as load on the output is capacitive load. Therefore, in order to drive
it at high speed, the large peak current is required. However, after charge/discharge particularly large current is not
required to keep that condition.
the capability of peak value 1 A is ensured.
potential. When the 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
phenomenon may cause the malfunction of the device. In such a case, the Schottky barrier diode should be
connected between the output and GND.
The AN8022L and AN8022SB employ the
The maximum sink/source current is 0.1 A
For the current capability, the peak current is major concern, and the particularly large current is not required
For the AN8022L or AN8022SB, capacitance value of the power MOSFET used is taking into account, and
The parasitic LC of the power MOSFET may produce ringing which makes the output pin go under the GND
CC
V
OVP
V
I
is under the stop voltage, the sink
DS
O
0
0
0
Figure 8. Timer latch basic operation
Figure 9
Power supply stop
Power supply stop
Power supply stop
AN8022L, AN8022SB
Schottky barrier
diode
Time
Time
Time
OVP
V
TH
6 V (typ.)
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