KA3843BD Fairchild Semiconductor, KA3843BD Datasheet - Page 4
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KA3843BD
Manufacturer Part Number
KA3843BD
Description
IC CONTROLLER PWM SMPS 14-SOP
Manufacturer
Fairchild Semiconductor
Datasheet
1.KA3843B.pdf
(10 pages)
Specifications of KA3843BD
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
8.2 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
14-SOIC (3.9mm Width), 14-SOL
Frequency-max
500kHz
Duty Cycle (max)
100 %
Output Current
1000 mA
Mounting Style
SMD/SMT
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
KA3842B/KA3843B/KA3844B/KA3845B
Electrical Characteristics
(V
Adjust V
Note:
1. Parameter measured at trip point of latch
2. Gain defined as:
3. These parameters, although guaranteed, are not 100 tested in production.
High peak currents associated with capacitive loads necessitate careful grounding techniques Timing and bypass capacitors
should be connected close to pin 5 in a single point ground. The transistor and 5K potentiometer are used to sample the
oscillator waveform and apply an adjustable ramp to pin 3.
4
A
Parameter
PWM SECTION
Max. Duty Cycle
Min. Duty Cycle
TOTAL STANDBY CURRENT
Start-Up Current
Operating Supply Current
Zener Voltage
CC
=
=15V, R
----------------- -
V
V
pin1
pin3
CC
above the start threshould before setting at 15V
T
,0
=10K , C
V
pin3
T
=3.3nF, T
0.8V
A
= 0 C to +70 C unless otherwise specified)
I
Symbol
CC(OPR)
D
D
D
(Continued)
(MAX)
(Max)
(MIN)
I
V
ST
Figure 1. Open Loop Test Circuit
Z
KA3842B/KA3843B
KA3844B/KA3845B
V
I
CC
pin3
= 25mA
=V
pin2
Conditions
=ON
-
-
Min.
95
47
30
-
-
-
Typ.
0.45
97
48
14
38
-
Max.
100
50
17
0
1
-
Unit
mA
mA
%
%
%
V