KKA4605-2 [KODENSHI]
Control IC for Switched Mode Power Supplies using MOS Transistors; 控制IC使用MOS晶体管开关电源
| 型号： | KKA4605-2 |
| 厂家： | 
KODENSHI KOREA CORP. |
| 描述： | Control IC for Switched Mode Power Supplies using MOS Transistors |
| 文件： | 总4页 (文件大小：168K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
Function
Information Input Concerning Secondary Voltage
Information Input Regarding the Primary Current
Input for Primary Voltage Monitoring
Ground
5.
Output
6.
Supply Voltage Input
7.
8.
Input for Soft Start and Integrator Circuit
Input for the Feedback of the Oscillator
1
KKA4605-2
Block Diagram
6
2
5
V2B
Reference
Voltage typ.
3V
Primary
Current
Voltage
Output Stage
and Current
Control
Supply Voltage Monitor
Converter
Circuit
VST
V6A V6E V6max
V6min
VREF
Start Pulse
Generator
4
1
Logic
VR
Current
Source
Control &
Overload
Amplifier
Stop
Comparator
Zero
Crossing
Detector
VV
Fold-back
Point
Primary
Voltage
Correction
Supervision
3
7
8
ABSOLUTE MAXIMUM RATINGS
Ta=-20 to 85oC; all voltages relatives to Vpp
Parameter
Symbol
Limit Values
min max
Unit
Notes
Voltages
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 1
pin 2
pin 3
pin 4
pin 5
pin 6
pin 7
pin 8
V1
V2
V3
V4
V5
V6
V7
I1
I2
I3
I4
I5
I6
I7
I8
Tj
Tstg
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
3
V
V
V
V
V
V
V
mA
mA
mA
A
A
A
mA
mA
oC
oC
V6
20
Supply voltage
Current
3
3
3
-1.5
-0.5
tp≤50µs; v≤0.1 *
tp≤50µs; v≤0.1
tp≤50µs; v≤0.1
1.5
0.5
3
3
125
125
-5
Junction temperature
Storage temperature
Operating Range
Supply voltage
-40
V6
Ta
7.5
-20
15.5
85
V
IC is on
Ambient temperature
oC
* tp= pulse width
v = duty circle
2
KKA4605-2
CHARACTERISTICS
Ta=25oC; VS=10V
Parameter
Symbol
Limit Values
Units
Test Condition
min.
max.
Start - Up Hysteresis
Start-up current drain
Switch-on voltage
I6EO
V6E
I6E1
1.6
13
16
mA
V
mA
V6=V6E
V6=V6E
I2,3=1mA
11
Switch-on current
Voltage Clamp (V6=10V; IC is off)
At pins 2,3 (V6≤V6E)
Control Range
Vmax
5.6
9.0
V
Control input voltage
Voltage gain of the control
circuit in the control value
Push-Pull Output Stage
Saturation voltages
Pin 5 sourcing
V1R
-VR
370
150
430
mV
Vsat0
VsatV
2.2
1.4
V
V
I5=-0.1A
I5=+0.1A
Pin5 sinking
Protection Circuit
Undervoltage protection for
V6: voltage at pin 5 = V5min if
V6< V6min
Undervoltage protection for
V6: voltage at pin 5 = V5min if
V6> V6max
V6min
6
8
V
V
V6max
16.7
APPLICATION DIAGRAM
R3
4.7
D6
FU1.25
+124
ٛ
180...260 V
R2
27K
4W
BYW76
C11
R4
330k
R11
820k
C4
33nF/630V
R12
47k
D2
BA159
C1
47µF
CR1
150
385V
F
n5
4x1N4007
D5
n2
R16
0.1
C5
4.7
nF
+17.5ٛ
R10
5.1k
R1
75k
C3
220pF
BYW72
C10
470µF
n4
R17
27
T1 BUZ90
D4
R15
0.1
+8.5
ٛ
BYW72
R13
47
C9
1000
C2
47
n3
µ
F
D1
µ
F
100V
1N4148
R8
47
3
6
2
5
8
1
C8
220nF-
R9
10k
47µF
7
ЭКР1087EY1
(TDA4605-2)
R7
2.5k
R6
1K
D3
n1
4
1N4148
C7
4.7nF
C6
R5
1µF
220
3
KKA4605-2
N SUFFIX PLASTIC DIP
(MS – 001BA)
A
Dimension, mm
5
4
8
1
Symbol
MIN
8.51
6.1
MAX
10.16
7.11
B
A
B
C
D
F
5.33
F
L
0.36
1.14
0.56
C
1.78
SEATING
PLANE
-T-
K
2.54
7.62
G
H
J
N
M
J
G
H
D
0°
10°
3.81
8.26
0.36
0.25 (0.010) M
T
2.92
7.62
0.2
K
L
M
N
NOTES:
1. Dimensions “A”, “B” do not include mold flash or protrusions.
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
0.38
4
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