MC33260
http://onsemi.com
8
PIN FUNCTION DESCRIPTION
Pin #
PDIP- -8
Pin #
SO- -8
Function
Description
1
7
Feedback Input
This pin is designed to receive a current that is proportional to the preconverter output
voltage. This information is used for both the regulation and the overvoltage and
undervoltage protections. The current drawn by this pin is internally squared to be used
as oscillator capacitor charge current.
2
8
V
control
This pin makes available the regulation block output. The capacitor connected between
this pin and ground, adjusts the control bandwidth. It is typically set below 20 Hz to
obtain a nondistorted input current.
3
1
Oscillator Capacitor
(C
T
)
The circuit uses an on- -time control mode. This on- -time is controlled by comparing the
C
T
voltage to the V
control
voltage. C
T
is charged by the squared feedback current.
4
2
Zero Current
Detection Input
This pin is designed to receive a negative voltage signal proportional to the current
flowing through the inductor. This information is generally built using a sense resistor.
The Zero Current Detection prevents any restart as long as the Pin 4 voltage is below
(- -60 mV). This pin is also used to perform the peak current limitation. The overcurrent
threshold is programmed by the resistor connected between the pin and the external
current sense resistor.
5
3
Synchronization
Input
This pin is designed to receive a synchronization signal. For instance, it enables to
synchronize the PFC preconverter to the associated SMPS. If not used, this pin must
be grounded.
6
4
Ground
This pin must be connected to the preregulator ground.
7
5
Gate Drive
The gate drive current capability is suited to drive an IGBT or a power MOSFET.
8
6
V
CC
This pin is the positive supply of the IC. The circuit turns on when V
CC
becomes higher
than 11 V, the operating range after startup being 8.5 V up to 16 V.
Figure 21. Application Schematic
1
8
7
6
5
2
3
4
L1
Filtering
Capacitor
Sync
M1
C1
D1
+
V
control
V
CC
Load
(SMPS, Lamp
Ballast,...)
R
o
CT
R
OCP
R
cs
D1...D4
DIP- -8 CONFIGURATION SHOWN
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