an8032 Panasonic Corporation of North America, an8032 Datasheet - Page 13

• Manufacturer Part Number: an8032
• Description: Active Filter Control Ic
• Manufacturer: Panasonic Corporation of North America

Voltage Regulators
[2] Operation descriptions (continued)
1. Normal control (continued)
Application Notes (continued)
3) Description of each function (continued)
(6) V
<Notes on the methods of providing V
<V
The method to give bias from sub-coil
start voltage 10 V typical and the stop voltage 8 V
typical. Be careful that the value for C1 shown in the
right figure must be set at a large value, otherwise,
the IC does not easily start.
Giving bias from power supply
circuit, separate power supply is provided so as to
give the bias from the separate power supply.
suppress the interference between the two power
supply lines : The supply voltage supply line of the
power system and that for the signal line are sepa-
rately provided in the IC chip and they are put to-
gether when wired to the pin of the package. Thus
the interference between 2 power supply lines is sup-
pressed.
However, the above method can not prevent all the
malfunctions due to noise. Therefore, in regard to
the current pass in which the drive current of the
power MOSFET flows, the pattern wiring should be
provided as short as possible, in the same way as
conventional practice to suppress the invasion of
noise of the drive system.
CC
output. The U.V.L.O. depends on this V
(The characteristics of U.V.L.O. are shown in the
right figure.)
interference>
CC
There is only 2 V typical difference between the
In the case such as of fluorescent lamp inverter
For the AN8032, the following method is used to
The same method is also used for the GND line.
The supply voltage terminal other than the
CC
>
CC
voltage.
I
CC
0
AN8032
AN8032
Totem pole type output circuit
GND
GND
characteristics
Start resistance
U.V.L.O.
V
V
V
OUT
(Stop voltage) (Start voltage)
CC
CC
R1
8
C1
C1
IC operation
V
PV
GND
OUT
10
Drive current
at turning on
Drive current
at turning off
CC
To fluorescent lamp
inverter circuit block
R1
R2
V
CC
AN8032
V
13