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UC2843AAY 데이터시트(PDF) 7 Page - Microsemi Corporation

부품명 UC2843AAY
상세설명  CURRENT MODE PWM CONTROLLER
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제조업체  MICROSEMI [Microsemi Corporation]
홈페이지  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

UC2843AAY 데이터시트(HTML) 7 Page - Microsemi Corporation

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C URRENT M ODE PWM C ONTROLLER
UC184xA/284xA/384xA
PRODUCT DA T ABOOK 1996/1997
7
Copyright © 1995
Rev. 1.2
12/95
P RODUCTION D AT A S HEET
TYPICAL APPLICA TION CIRCUITS
(continued)
FIGURE 6. — SLOPE COMPENSATION
FIGURE 7. — OPEN LOOP LABORATORY FIXTURE
2
3
4
8
7
6
5
COMP
V
FB
I
SENSE
R
TCT
V
REF
V
CC
OUTPUT
GROUND
0.1µF
0.1µF
A
UCx84xA
R
T
2N2222
100K
4.7K
1K
4.7K
5K
I
SENSE
ADJUST
ERROR AMP
ADJUST
C
T
1K
GROUND
OUTPUT
V
CC
V
REF
1
OSCILLATOR
V
REF
GOOD LOGIC
S
R
5V
REF
INTERNAL
BIAS
8(14)
4(7)
2(3)
1(1)
R
F
C
F
R
d
R
i
From V
O
R
SLOPE
2N222A
R
T
5V
UVLO
2.5V
ERROR
AMP
C
T
1V
2R
R
C.S.
COMP
PWM
LATCH
5(9)
3(5)
5(8)
CR
S
R
6(10)
7(11)
7(12)
V
CC
DC BUS
V
O
Q1
UCx84xA
Due to inherent instability of current mode converters running above 50% duty cycle, slope compensation should be added to either
the current sense pin or the error amplifier. Figure 6 shows a typical slope compensation technique.
High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be
connected 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.


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