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KODENSHI KOREA

KKA4605-2 Datasheet Preview

KKA4605-2 Datasheet

Control IC

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TECHNICAL DATA
Control IC for Switched Mode Power Supplies using MOS
Transistors
The IC KKA4605-2 controls the MOS - power transistor and performs all necessary
regulation and monitoring function in free running flyback converters. Because of the fact
that a wide load range is achieved, this IC is applicable for consumer as well as industrial
power supplies.
The serial circuit and primary winding of the flyback transformer are connected in series to
the input voltage. During the switch - on period of the transistor, energy is stored in the
transformer. During the switch - off period the energy is fed to the load via the secondary
winding. By varying switch - on time of the Power transistor, the IC controls each portion of
energy transferred to the secondary side such that the output voltage remains nearly
independent of load variations. The required control information is taken from the input
voltage during the switch - on period and from a regulation winding during the switch - off
period. A new cycle will start if the transformer has transferred the stored energy
completely into the load.
FEATURES:
Fold - back characteristics provides overload protection for external components
Burst operation under secondary short - circuit condition implemented
Protection against open or short of the control loop
Switch - off if line voltage is too low (undervoltage switch - off)
Line voltage depending compensation of fold - back point
Soft start for quiet start - up without noise generated by the transformer
Chip - over temperature protection (thermal shutdown)
On - chip ringing suppression circuit against parasitic oscillations of the transformer
P-DIP-8-1
In the different voltage ranges the switched - mode Power supply (SMPS) behaves as
follow:
No load operation. The Power supply is operating in the burst mode at typical 20 to 40
kHz. The output voltage can be a little bit higher or lower than the nominal value
depending on the design of the transformer and the resistors of the control voltage divider.
Nominal operation. The switching frequency is reduced with increasing load and
decreasing AC voltage. The duty factor primarily depends on the AC voltage. The output
voltage is only depends on the load.
Overload point. Maximum output Power is available at this point of the output
characteristic.
Overload. The energy transferred per operation cycle is limited at the top. Therefore the
output voltages declines by secondary overloading.
PIN DEFINITION
Pin #
1.
2.
3.
4.
5.
6.
7.
8.
Function
Information Input Concerning Secondary Voltage
Information Input Regarding the Primary Current
Input for Primary Voltage Monitoring
Ground
Output
Supply Voltage Input
Input for Soft Start and Integrator Circuit
Input for the Feedback of the Oscillator
1




KODENSHI KOREA

KKA4605-2 Datasheet Preview

KKA4605-2 Datasheet

Control IC

No Preview Available !

www.DataSheet4U.com
KKA4605-2
Block Diagram
62
Reference
Voltage typ.
3V
Supply Voltage Monitor
VREF
4
Current
Source
1
V6min V6A V6E V6max
VR Control &
Overload
Amplifier
V2B Primary
Current
Voltage
Converter
VST
Start Pulse
Generator
Stop
Comparator
Fold-back
Point
Correction
VV Primary
Voltage
Supervision
37
5
Output Stage
and Current
Control
Circuit
Logic
Zero
Crossing
Detector
8
ABSOLUTE MAXIMUM RATINGS
Ta=-20 to 85oC; all voltages relatives to Vpp
Parameter
Voltages
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
Current
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
Junction temperature
Storage temperature
Operating Range
Supply voltage
Ambient temperature
* tp= pulse width
v = duty circle
Symbol
V1
V2
V3
V4
V5
V6
V7
I1
I2
I3
I4
I5
I6
I7
I8
Tj
Tstg
V6
Ta
Limit Values
min max
-0.3 3
-0.3
-0.3
-0.3
-0.3 V6
-0.3 20
-0.3
3
3
3
-1.5
-0.5 1.5
0.5
3
-5 3
125
-40 125
7.5 15.5
-20 85
Unit Notes
V
V
V
V
V
V Supply voltage
V
mA
mA
mA
A tp50µs; v0.1 *
A tp50µs; v0.1
A tp50µs; v0.1
mA
mA
oC
oC
V IC is on
oC
2


Part Number KKA4605-2
Description Control IC
Maker KODENSHI KOREA
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