KA3844B Fairchild Semiconductor, KA3844B Datasheet - Page 3

• Manufacturer Part Number: KA3844B
• Description: IC CONTROLLER PWM SMPS 8-DIP
• Manufacturer: Fairchild Semiconductor

Specifications of KA3844B

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 50%
• Voltage - Supply: 11.5 V ~ 30 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Frequency-max: 500kHz
• Duty Cycle (max): 50 %
• Output Current: 1000 mA
• Mounting Style: Through Hole
• Switching Frequency: 500 KHz
• Supply Current: 17 mA
• Maximum Operating Temperature: + 70 C
• Fall Time: 35 ns
• Minimum Operating Temperature: 0 C
• Rise Time: 45 ns
• Synchronous Pin: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Electrical Characteristics
(V
Parameter
Frequency Change with Voltage
REFERENCE SECTION
Reference Output Voltage
Line Regulation
Load Regulation
Short Circuit Output Current
OSCILLATOR SECTION
Oscillation Frequency
Oscillator Amplitude
ERROR AMPLIFIER SECTION
Input Bias Current
Input Voltage
Open Loop Voltage Gain
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
CURRENT SENSE SECTION
Gain
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
OUTPUT SECTION
Low Output Voltage
High Output Voltage
Rise Time
Fall Time
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
Min. Operating Voltage
(After Turn On)
CC
=15V, R
T
=10K , C
T
=3.3nF, T
A
V
= 0 C to +70 C, unless otherwise specified)
I
Symbol
SOURCE
V
OPR(MIN)
V
V
PSRR
PSRR
V
V
f/ V
I
I
I
TH(ST)
G
I(MAX)
V
V
V
V
I(E>A)
V
V
BIAS
SINK
BIAS
I
G
OSC
REF
SC
t
t
OH
OH
REF
REF
VO
OL
OL
R
f
F
V
CC
12V V
12V V
T
12V V
1mA I
T
T
12V V
V
2V V
V
V
V
V
(Note 1 & 2)
V
I
I
I
I
T
T
KA3842B/KA3844B
KA3843B/KA3845B
KA3842B/KA3844B
KA3843B/KA3845B
SINK
SINK
SOURCE
SOURCE
J
A
J
J
J
pin1
pin2
pin2
pin2
pin2
pin1
= 25 C, I
= 25 C
= 25 C, C
= 25 C, C
= 25 C
= 2.3V, V
= 2.5V
= 2.7V, V
= 2.3V, R
= 2.7V, R
= 5V(Note 1)
= 20mA
= 200mA
O
REF
CC
CC
CC
CC
4V (Note3)
= 20mA
= 200mA
Conditions
25V
25V
20mA
REF
25V (Note3)
25V (Note1,3)
L
L
= 1nF (Note 3)
= 1nF (Note 3)
pin1
pin1
L
L
-
-
-
= 1mA
= 15K
= 15K
= 5V
= 1.1V
to GND
to Pin 8
KA3842B/KA3843B/KA3844B/KA3845B
Min.
4.90
2.42
2.85
14.5
-0.6
0.9
7.8
8.5
7.0
47
65
60
13
12
2
5
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ.
5.00
-100
0.05
2.50
0.08
13.5
13.0
16.0
10.0
-0.1
-1.0
1.6
0.8
1.4
8.4
7.6
52
90
70
70
45
35
-3
6
6
7
6
3
1
Max. Unit
-180
5.10
2.58
3.15
17.5
11.5
150
150
-10
1.1
1.1
0.4
2.2
9.0
8.2
20
25
57
-2
1
-
-
-
-
-
-
-
-
-
V
KHz
V/V
mV
mV
mA
mA
mA
dB
dB
dB
ns
ns
%
P-P
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
3