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PDF UC3845A Data sheet ( Hoja de datos )

Número de pieza UC3845A
Descripción High Performance Current Mode PWM Controller
Fabricantes ETC 
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No Preview Available ! UC3845A Hoja de datos, Descripción, Manual

Replacement of
UC3842A/43A/44A/45A
High Performance Current
Mode PWM Controller
MIK3842A/43A/44A/45A
July 1995 –revised July 2002
Description
The MIK3842A(AM)/43A(AM)/44A(AM)/45A(AM) are fixed frequency current mode PWM controller. They are specially designed for
OFFLine 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 MIK3842A(AM) and MIK3844A(AM) have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding
thresholds for the MIK3843A(AM)/45A(AM) are 8.4V (on) and 7.6V (off). The MIK3842A(AM) and MIK3843A(AM) can operate within 100%
duty cycle. The MIK3844A(AM) and UC3845A(AM) can operate within 50% duty cycle.
The MIK384XA(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 (MIK384XA)
500KHz (MIK384XAM)
Pin Connection
VREF
8
Block diagram
(toggle flip flop used only in MIK3844, MIK3845)
5V
VREF
SET/
RESET
UVLO
Top view
VCC 7
36V GND
5
INTERNAL
BIAS
VREF GOOD
LOGIC
2 VFB
1/2 VREF
+ ERR
- AMP
COMP
1
CURRENT
SENSE
3
2R
R
C.S.
COMP
1V
4 RT/CT
OSCILLATOR
R
PWM
LATCH
S
T
POWER VCC
7
OUT
6
5
POWER GND
Absolute Maximum Ratings
Symbol
Parameter
VCC
IO
VI
ISINK (E.A)
PO
Tstg
TL
Supply Voltage (low impedance source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Power Dissipation (TA=250C)
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Maximum
30
±1
0.3 to 5.5
10
1
-65 to150
260
Units
V
A
V
mA
W
oC
oC
Page 1 of 8

1 page




UC3845A pdf
Replacement of
UC3842A/43A/44A/45A
MIK3842A/43A/44A/45A
High Performance Current
Mode PWM Controller
July 1995 –revised July 2002
Figure 7. External Clock Synchronization
Figure 8. Soft-Start Circuit
Page 5 of 8

5 Page










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