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PDF AN8032 Data sheet ( Hoja de datos )
| Número de pieza | AN8032 | |
| Descripción | Active filter control IC | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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Voltage Regulators
AN8032
Active filter control IC
s Overview
In supplying electric power from commercial power
2.4±0.25
6.0±0.3
3.3±0.25
Unit: mm
supply to various electrical equipment, there is a possi-
bility that the harmonic distortion generated in the power
line may give obstruction to the power facilities or other
electrical equipment. The use of active filter is one of the
methods to solve the harmonic distortion problems.
The AN8032 is a monolithic IC which incorporates
the control and protection functions into one package so
that the active filter can be constructed easily. It is most
suitable for the measures against the harmonic distortion
problems such as lighting equipment.
9
8
7
6
5
4
3
2
1
0.3
+0.1
–0.05
s Features
• Self-excited peak current mode is adapted.
3.0±0.3
• Built-in protection circuit for preventing the overvolt-
SIP009-P-0000C
age generated under a small load
• Easy constant setting with enlarged dynamic range of multiplier and error amplifier.
• Overvoltage protection terminal separately set to pass the short test of the safety standards
• Using totem pole output circuit which allows the power MOSFET to be directly driven.
• Built-in low voltage protection circuit which ensures the on-resistance during the power MOSFET operation.
• Timer circuit is built in for realizing automatic start.
s Applications
• Lighting equipment and switching power supply equipment
s Block Diagram
Under voltage Over voltage
VBTH clamper
clamper
9 VCC
One
shot
U.V.L.O. comp.
6 VB
2.5 V
VREF
10 V/8 V
Timer
Current
comp.
MPI 2
Multiplier
2.5 V
Drive
8 VOUT
OVP comp.
2.6 V 5 OVP
Error amp.
1 CS
4 EI
2.5 V
1
1 page  
Voltage Regulators
AN8032
s Terminal Equivalent Circuits (continued)
Pin No.
Equivalent circuit
Description
6 VB:
PVCC Approx. 7.1 V Approx. 7.1 V The terminal is connected via the transformer's
Upper limit
voltage clamp
sub-coil and resistor. The reset of transformer is
detected and the trigger signal to turn on the power
MOSFET is sent.
6 Since the coil signal of transformer is input as
VB current, the IC incorporates the circuit which
Lower limit
voltage clamp
Comparator
input
clamps the upper/lower limit voltage to prevent
malfunction.
I/O
I
7
GND:
Power system ground
7
Signal system ground
Grounding terminal
This terminal is used in common for grounding the
control system and the power system.
8
VOUT:
O
9 The output terminal.
It is capable of driving the gate of power MOSFET
directly.
8
9
VCC:
The supply voltage terminal.
The supply voltage terminal for the power system
9 and that for the signal system are put together as
U.V.L.O.
Inside bias
one terminal with internal connection in order to
(Appox. 7.1 V) greatly decrease the common impedance.
This double-functioning terminal monitors the
VB
Upper limit
voltage clamp
Power
MOSFET
drive block
supply voltage, and has start/stop operation thresh-
old.
5
5 Page 
Voltage Regulators
AN8032
s Application Notes (continued)
[2] Operation descriptions (continued)
1. Normal control (continued)
3) Description of each function (continued)
(1) VB (continued)
<Setting the VB terminal constant> (continued)
• Zero-cross switching
Zero-cross switching can be realized by using
the local resonance when turning on the power
MOSFET in order to suppress the loss.
By connecting the resonance capacitor CP be-
tween the drain and source of the power MOSFET,
and using the inductance of the transformer's pri-
mary side LP, the resonance is produced after dis-
charging the accumulated energy of the transformer.
The capacitor for delay should be connected to the
VB terminal so that the next turn-on could occur at
the time when the resonance occurred and the drain
voltage of the power MOSFET has reached around
0 V.
However, it is necessary to take care that the
zero-cross conditions could deviate since the delay
amount varies depending on the conditions such as
the input voltage.
(2) CS
AN8032
VB
VOUT
Delay capacitor
A
B
CB
LP
RB
CP
A-point voltage
0V
Resonance capacitor
Resonance by LP − CP
Zero-cross
switching
B-point voltage VBTH
0V
Delay
Power MOSFET
On
Power MOSFET
Off
The terminal for detecting the current when the power MOSFET is turned on.
The current flow when the power MOSFET is turned on is equivalent to the current flow in the
inductor. Therefore, the necessary power value can be controlled by controlling the peak value of the
above current.
The input D-range of this terminal is from 0 V to 5 V. However, since dissipation becomes larger if
the power MOSFET current detecting resistance is set at larger value. A value from 0.22 Ω to 0.47 Ω is
the standard considering the relationship with the S/N.
The charge and discharge current to and from the parasitic capacitance of the power MOSFET,
transformer or printed circuit wiring flow in the power MOSFET detection resistor at turning-on and off.
Since such current generates noise and causes malfunction, it is necessary to incorporate a filter to re-
move such irregular element.
Parasitic
capacitance
Spike
VB
Filter
ICS 0 A
Spike
(3) MPI
Figure 6. CS terminal explanation
The MPI is the terminal for monitoring the AC input voltage. The voltage which is resistance-divided
from the input voltage after full-wave rectification is input. The input D-range of the multiplier is from
0 V to 4.5 V typical and output D-range is from 0 V to 5.4 V typical.
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet AN8032.PDF ] | |
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