an8032 Panasonic Corporation of North America, an8032 Datasheet - Page 7

• 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)
Multiplier output
(MPO) voltage
2) Control outline description (Refer to figure 2 and figure 3.)
MPI
input voltage
EI
input voltage
Transformer reset
voltage detection (V
(1) Input voltage (E
(2) Output voltage (E
(3) Multiplication of input voltage and output voltage
resistor is input to the multiplier input terminal of the AN8032 (MPI terminal).
resistor is amplified by the error amplifier of the AN8032 (Input to noninverting input terminal (EI
terminal)) and input to another multiplier input (EO terminal, which also functions as output for error
amplifier).
signal which monitors both the input voltage and output voltage of the chopper circuit.
The voltage which is divided from the input voltage of chopper circuit (E
The voltage which is divided from the output voltage of chopper circuit (E
The signals input to the multiplier are multiplied and outputted from the multiplier. This output is a
0 V
0 V
0 V
0 V
0 V
B
Approx. 2.5 V typ.
)
IN
OUT
) detection
) detection
Power MOS turned off
Figure 2. Explanation of normal control operation
Power MOS turned off
Enlarged
Reset operation of transformer bias coil
V
Power MOS turned on bias coil voltage
V
Time
B
B
Time
lower limit voltage (regulated inside IC)
lower limit voltage (regulated inside IC)
Multiplier output (MPO) voltage
Power MOSFET current detection
(CS) voltage
OUT
IN
) by using the external
generated
) by using the external
Time
Time
Time
voltage inversion
AN8032
7