KA3843 ESTEK [Estek Electronics Co. Ltd], KA3843 Datasheet

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KA3843

Manufacturer Part Number
KA3843
Description
fixed frequency current mode PWM controller
Manufacturer
ESTEK [Estek Electronics Co. Ltd]
Datasheet
1.KA3843.pdf (7 pages)

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Description
The 3842A(AM)/43A(AM)/44A(AM)/45A(AM) are fixed frequency current mode PWM controller. They are specially designed for
OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed
oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator,
and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout
and current limiting. The 3842A(AM) and 3844A(AM) have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding
thresholds for the 3843A(AM)/45A(AM) are 8.4V (on) and 7.6V (off). The MIK3842A(AM) and MIK3843A(AM) can operate within 100% duty
cycle. The 3844A(AM) and UC3845A(AM) can operate within 50% duty cycle.
The 384XA(AM) has Start-Up Current 0.17mA (typ).
Features
• Low Start-Up and Operating Current
• High Current Totem Pole Output
• Undervoltage Lockout With Hysteresis
• Operating Frequency Up To 300KHz (384XA)
Absolute Maximum Ratings
Symbol
I
SINK (E.A)
Tstg
V
V
T
I
Po
CC
O
L
I
Supply Voltage (low impedance source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Power Dissipation (T
8
1
3
2
V
CURRENT
R
V
COMP
SENSE
500KHz (384XAM
FB
/C
T
1/2 V
INTERNAL
BIAS
A
=25
ERR
REF
+
(toggle flip flop used only in MIK3844, MIK3845)
0
C)
OSCILLATOR
)
Parameter
5V
V
Block diagram
REF
2R
V
RE
R
LOGIC
SET/
RESET
GOOD
1V
1
C.S.
COMP
F
UVLO
Pin Connection
R
S
T
LATCH
PWM
36V
Top view
BEIJING ESTEK ELECTRONICS CO.,LTD
POWER V
POWER GND
GND
Maximum
−0.3 to 5.5
-65 to150
CC
OUT
5
7
5
6
260
30
±1
10
7
1
Units
mA
o
o
V
A
V
C
C
W W

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KA3843 Summary of contents

Page 1

Description The 3842A(AM)/43A(AM)/44A(AM)/45A(AM) are fixed frequency current mode PWM controller. They are specially designed for OFF−Line and converter applications with a minimal external components. Internally implemented circuits include a trimmed oscillator for precise duty cycle control, a ...

Page 2

Electrical characteristics (*V =15V, R =10kΩ, C =3.3nF Characteristics Symbol Reference Section Reference Output Voltage V REF ∆V Line Regulation ∆V Load Regulation Short Circuit Output Current I SC Oscillator Section f Oscillation Frequency ...

Page 3

Pin functions N Function 1 COMP This pin is the Error Amplifier output and is made for loop compensation This is the inverting input of the Error Amplifier normall y connected to the switching power supply ...

Page 4

V REF SLOPE SENSE R S SCR must be selected for a holding current of less than 0.5mA. The simple two transistor circuit can be used in place of ...

Page 5

Figure 7. External Clock Synchronization Figure 8. Soft-Start Circuit 5 BEIJING ESTEK ELECTRONICS CO.,LTD ...

Page 6

Typical Performance Characteristics Ω 50 5nF 10nF 100 200 500 Figure 1. Timing Resistor vs. Oscillator Dm ...

Page 7

V sat (V) Sourse Saturation (Load to Ground µ Pulsed Load 120Hz R ate 3 2 Sink Sa tura tion 1 ( 200 400 Figure . 7 Output ...

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