KA3843 ESTEK [Estek Electronics Co. Ltd], KA3843 Datasheet - Page 6

• Manufacturer Part Number: KA3843
• Description: fixed frequency current mode PWM controller
• Manufacturer: ESTEK [Estek Electronics Co. Ltd]

Dm ax
(%)
R
(K
T
) Ω
40
V
(V)
90
80
70
60
50
1.0
0.8
0.6
0.4
0.2
50
20
10
th
5
2
1
10
500
Figure 1.
0
Figure 5.
V CC = 15
T
Figure 3.
C
20
1
C
O
25
C
T
V CC = 15V
5nF
Timing Resistor vs. Oscillator
Timing Resistor (MIK3842/4
30
Current Sense Input Threshold vs.
Error Amp Output Voltage
10nF
O
125 C
Maximum Output Duty Cycle vs.
50
2
2
100
T
4
Typical Performance Characteristics
O
25 C
3
200
V
= CC
T
Frequency.
300
.
= 25
.
3 )
5
3.3nF
15 V
R (
V
f
T
(
O
KHz)
6
(dB)
%
100
-20
50
30
20
10
(mA)
80
60
40
20
I S C
3
90
80
5
2
70
60
50
1
10
500
0
Figure 2.
10
C
Figure 6.
Figure 4.
C
20
200pF
100
C
0
500pF
Output Dead-Time vs. Oscillator Frequenc
30
Reference Short Circuit Current vs.
1nF
Error Amp Open-Loop Gain vs.
50
1K
Temperature
BEIJING ESTEK ELECTRONICS CO.,LTD
Fr
25 50
100
10K
C
C
10nF
200
V CC = 15 V
V O = 2V to 4V
R
= L
V CC = 15 V
100K
e quency
.
5nF
75
.
C
O
25
100K
300
100pF
C
V
T
C
CC
=
100
1M
= 15 V
2nF
25
O
f
T
f (Hz)
O
)
.
y
KHz)