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KA3842 Datasheet(PDF) 1 Page - Estek Electronics Co. Ltd

Part No. KA3842
Description  fixed frequency current mode PWM controller
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Maker  ESTEK [Estek Electronics Co. Ltd]
Homepage  http://www.estek.com.cn/en/index.asp
Logo ESTEK - Estek Electronics Co. Ltd

KA3842 Datasheet(HTML) 1 Page - Estek Electronics Co. Ltd

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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)
500KHz
(384XAM
)
Pin Connection
Block diagram
(toggle flip flop used only in MIK3844, MIK3845)
Top view
7
8
V
5V
VREF
SET/
RESET
UVLO
36V
GND
5
2
1
VFB
COMP
INTERNAL
BIAS
1/2 VREF
+
ERR
VRE
GOOD
F
LOGIC
2R
C.S.
COMP
1V
R
R
PWM
LATCH
POWER VCC
7
OUT
6
3
CURRENT
SENSE
R
/C
T
OSCILLATOR
S
T
5
POWER GND
Absolute Maximum Ratings
Symbol
Parameter
Maximum
Units
VCC
Supply Voltage (low impedance source)
30
V
IO
Output Current
±1
A
VI
Input Voltage (Analog Inputs pins 2,3)
−0.3 to 5.5
V
ISINK (E.A)
Error Amp Output Sink Current
10
mA
Po
Power Dissipation (TA=25
0C)
1
W
W
Tstg
Storage Temperature Range
-65 to150
oC
oC
TL
Lead Temperature (soldering 5 sec.)
260
1
BEIJING ESTEK ELECTRONICS CO.,LTD


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