Panasonic AN8031 Datasheet

Voltage Regulators

AN8031

Active filter control IC

■ Overview

In supplying electric power from commercial power

6.0±0.3

2.4±0.25

3.3±0.25

Unit: mm

supply to various electrical equipment, there is a possi­bility 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 AN8031 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.

■ Features

23.3±0.3

9
8
7
6
5
4
3
2

1

0.3

+0.1
–0.05

0.5±0.1

2.54

1.5±0.25

1.5±0.25

3.0±0.3

1.4±0.3

• Self-excited peak current mode is adapted.

• 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.

• 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.

■ Applications

• Lighting equipment and switching power supply equipment

30°

■ Block Diagram

MPI

3

One
shot

Timer

Current
comp.

7

2.5 V

GND

Under voltage

clamper

V

Multiplier

2.5 V

U.V.L.O. comp.

REF

Error amp.

4

Over voltage

clamper

10 V/8 V

Drive

OVP comp.

2.5 V

EO

2.6 V

1

SV

CC

6

V

B

9

PV

CC

8

V

OUT

2

CS

5

EI

1

AN8031 Voltage Regulators

■ Pin Descriptions

Pin No. Symbol Description

1SVCCControl system supply-voltage pin
2 CS Comparator input pin
3 MPI Multiplier input pin
4 EO Error amplifier output pin / multiplier input pin
5 EI Error amplifier inverting input pin / overvoltage protection input pin
6VBTransformer-reset detection pin
7 GND Grounding pin
8V

OUT

9PVCCPower system supply-voltage pin

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
CS allowable application voltage V
MPI allowable application voltage V
EI allowable application voltage V
Output allowable current I
Peak output current I
VB allowable flow-in current I
VB allowable flow-out current I
Power dissipation P
Operating ambient temperature
Storage temperature

Note)*: Expect for the operating ambient temperature and storage temperature, all ratings are for Ta = 25°C.

*

Output pin

*

CC

CS

MPI

EI

O

OP

BI

BO

D

T

opr

T

stg

35 V

− 0.5 to +7V

− 0.5 to +7V

− 0.5 to +7V
±150 mA

±1A
+5mA

−5mA

874 mW

−30 to +85 °C

−55 to +150 °C

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

CC

■ Electrical Characteristics at Ta = 25°C

Parameter Symbol Conditions Min Typ Max Unit

Error detection feedback threshold V
voltage 1

Error detection low-level output voltage
Error detection high-level output voltage
Error detection input bias current I
Error detection output supply current I

2

EITH1

V

EOLIEO

V

EOHIEI

EI

EO

0 to 34 V

2.35 2.50 2.65 V

= 0 mA, VEI = 5 V  1.0 1.6 V

= 0 mA, VEI = 0 V 5.0 5 . 7  V

VEI = 0 V − 0.3 −1.0 µA
VEI = 0 V, VEO = 1 V 0.25 0.50 0.75 mA

Voltage Regulators AN8031

■ Electrical Characteristics (continued) at Ta = 25°C

Parameter Symbol Conditions Min Typ Max Unit

Multiplier input D-range (upper limit) V
Multiplier output D-range (upper limit)

V

MPOHVEO

Multiplier gain G
Multiplier input bias current I
Coil detection input threshold voltage V
Coil detection hysteresis width dV
Coil detection high-level clamp voltage
Coil detection low-level clamp voltage
Current detection input offset voltage V

V
V

CSOFF

Current detection input bias current I
Overvoltage detection input V

threshold voltage
V

− V

OVP

EITH1

Low-level output voltage V
High-level output voltage V
Standby output voltage V

OUTLIOUT

OUTHIOUT

OUTSTBIOUT

U.V.L.O. start voltage V
U.V.L.O. stop voltage V
U.V.L.O. start - stop voltage difference
Standby current I

dV

CCSTBVCC

Operation current without load I

MPIHVEO

MP

MPI

BTH

B

BHIB

BLIB

CS

OVP

 70 100 130 mV

CCST

CCSP

CC

CC

= 5 V 4.0 4.5  V
= 5 V 4.8 5.4  V

1.0 1.2 1.4 1/V

V

= 0 V −1.5 −3.0 µA

MPI

1.2 1.5 1.8 V
50 100 200 mV

= 5 mA 7.0 7.5 8.0 V
= −5 mA − 0.3 − 0.2 0 V

 3.5 15 mV

VCS = 0 V − 0.5 −2.0 µA

2.45 2.60 2.75 V

= 100 mA  0.9 1.5 V
= −100 mA 9.2 10.2  V
= 10 mA  0.8 1.5 V

9.2 10.0 10.8 V

7.0 8.0 9.0 V

dVCC = V

CCST

− V

CCSP

1.75 2.00 2.50 V

= 7 V 40 80 120 µA

VCC = 12 V  6.0 10.0 mA

• Design reference data

Note) The characteristics listed below are reference values based on the IC design and are not guaranteed.

Parameter Symbol Conditions Min Typ Max Unit

Error detection feedback V

EITH2Ta

= −25°C to +85°C 2.3 2.7 V

threshold voltage 2
Error detection open-loop gain G
Error detection gain band width f
Multiplier input D-range (lower limit) V
Multiplier output D-range (lower limit)
Current detection − output delay td
Overvoltage detection − output delay td
Output rise time t
Output fall time t
Timer delay time td

AV

BW

MPILVEO

V

MPOLVEO

CS

OVP

r

f

TIM

= 5 V 0 V
= 5 V 0 V

VCC = 12 V, V
VCC = 12 V, V

= 10% → 90% 50 ns

OUT

= 90% → 10% 50 ns

OUT

85 dB

1.0 MHz

200 ns
500 ns

400 µs

3

AN8031 Voltage Regulators

■ Terminal Equivalent Circuits

Pin No. Equivalent circuit Description I/O

1SV

1

:I

CC

The supply voltage terminal for control system.
It monitors the supply voltage and has operating
threshold value for start/stop.

U.V.L.O.

Internal bias
(Approx. 7.1 V)

2 CS: I

Approx. 7.1 V

The input terminal of comparator which detects

To high-speed
converter

the current value flowing in power MOSFET.
The output level of multiplier and the current
value of power MOSFET input from the CS

2

terminal are compared. If the later becomes larger
than the former, the V

is set to low level and

OUT

the power MOSFET output is cut.

3 MPI: I

Approx. 7.1 V

The input terminal of multiplier
The voltage after a full-wave rectified AC input
voltage are monitored.

3

4 EO: O

Approx. 7.1 V Approx. 7.1 V

The output terminal of error amplifier / the input
terminal of multiplier.

Error amplifier
output

Multiplier
input

4

The error amplifier monitors the output voltage
of active filter and amplifies its error portion and
outputs to the multiplier. Therefore, this terminal
serves as another input terminal of the multiplier.

5 EI: I

Approx.

7.1 V

Approx.

7.1 V

Approx.

7.1 V

Approx.

7.1 V

The inverted input terminal of error amplifier / the
overvoltage protection input terminal.
To the noninverted input terminal, the internal
reference voltage of IC (2.5 V typ.) is input.
Since this terminal monitors the output voltage of

Overvoltage
protection input

Error amplifier

5

output

the active filter, it also functions as the input ter­minal for the overvoltage protector which detects
the overvoltage of output voltage and cuts off the

power MOSFET.

4

Voltage Regulators AN8031

■ Terminal Equivalent Circuits (continued)

Pin No. Equivalent circuit Description I/O

6V

CC

Upper limit
voltage clamp

Approx. 7.1 VPV

Approx. 7.1 V

:I

B

The terminal is connected via the transformer's
sub-coil and resistor. The reset of transformer is
detected and the trigger signal to turn on the power
MOSFET is sent.

6

V

Lower limit
voltage clamp

B

Comparator
input

Since the coil signal of transformer is input as
current, the IC incorporates the circuit which
clamps the upper/lower limit voltage to prevent
malfunction.

7 GND: 

7

Grounding terminal
This terminal is used in common for grounding

the control system and the power system.

8V

9

:O

OUT

The output terminal.
It is capable of driving the gate of power MOSFET
directly.

8

9 PV

9

: 

CC

The supply voltage terminal for power.

V

B

upper limit
voltage clamp

Power
MOSFET
drive block

It determines the upper limit of output drive volt­age. Normally, it is used at the same potential of

SVCC .

5

AN8031 Voltage Regulators

■ Application Notes

[1] PD  Ta curve of SIP009-P-0000C

1 000

900
874

800

700

(mW)

D

600

500

400

Power dissipation P

300

200

100

0

0 25 150

[2] Operation descriptions

1. Normal control

1) Application outline
As shown in figure 1, the standard application of the AN8031 is a booster chopper circuit, which inputs

the voltage rectified from the commercial supply of 100 V/200 V (A in figure 1) and outputs the DC voltage
of 400 V (B in figure 1).

It controls so that the input current proportional to the input voltage (C, D in figure 1) could be flown.
The reason for selecting the output voltage of 400 V is that the withstanding voltage of components and

the operation limitation of booster chopper (input voltage < output voltage) under the worldwide input
voltage are taken into consideration.

PD  T

a

Independent IC without a heat sink
R

= 143°C/W

th( j−a)

PD = 874 mW (25°C)

50 75 10085 125

Ambient temperature Ta (°C)

Booster circuit so that set at: E

IN(max)

< E

OUT

D. Input current

0 A

(IIN)

A. Voltage after rectification

)

(E

IN

E

IN(max)

0 V

B. Output voltage (E

400 VDC

0 V

OUT

)

Active filter

Input current proportional

I

IN

E

IN

E

OUT

Output

to input voltage flows.

SBD

C. Input voltage (VIN)

Commercial
power supply (AC)

Input

Load

V

IN

Diode bridge

AN8031

0 V

Booster chopper circuit

Figure 1. Application outline description

6

Voltage Regulators AN8031

■ Application Notes (continued)

[2] Operation descriptions (continued)

1. Normal control (continued)

2) Control outline description (Refer to figure 2 and figure 3.)

(1) Input voltage (E

The voltage which is divided from the input voltage of chopper circuit (E

resistor is input to the multiplier input terminal of the AN8031 (MPI terminal).

(2) Output voltage (E

The voltage which is divided from the output voltage of chopper circuit (E
resistor is amplified by the error amplifier of the AN8031 (Input to inverted input terminal (EI terminal))
and input to another multiplier input (EO terminal, which also functions as output for error amplifier).

(3) Multiplication of input voltage and output voltage

The signals input to the multiplier are multiplied and outputted from the multiplier. This output is a
signal which monitors both the input voltage and output voltage of the chopper circuit.

MPI
input voltage

0 V

) detection

IN

) detection

OUT

) by using the external

IN

) by using the external

OUT

Time

EI
input voltage

Multiplier output
(MPO) voltage

Transformer reset
voltage detection (V

Approx. 2.5 V typ.

0 V

0 V

0 V

)

B

0 V

Enlarged

Power MOS turned off

Power MOS turned off

Time

Time

Multiplier output (MPO) voltage

Power MOSFET current detection
(CS) voltage

Time

V

lower limit voltage (regulated inside IC)

B

Power MOS turned on = bias coil voltage
generated

Reset operation of transformer = bias coil
voltage inversion

VB lower limit voltage (regulated inside IC)

Time

Figure 2. Explanation of normal control operation

7