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參數(shù)資料
| 型號(hào)： | SG1842 |
| 廠商： | Microsemi Corporation |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 電流模式PWM控制器 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SG1842 |
C
U R R E N T
-M
O D E
PWM C
O N T R O L L E R
SG1842/SG1843 Series
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
13
Copyright 2000
Rev. 1.6 4/00
P
R O D U C T I O N
D
A T A
S
H E E T
T Y P I C A L A P P L I C AT I O N C I R C U I T S
(continued)
FIGURE 23.
— SLOPE COMPENSATION
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.
Due to inherent instability of current mode converters running above 50% duty cycle, a slope compensation should be added to
either current sense pin or the error amplifier. Figure 23 shows a typical slope compensation technique.
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)
C
R
S
R
6(10)
7(11)
7(12)
V
CC
V
O
Q1
SG1842/43
V
IN
5V
FIGURE 24.
— OPEN LOOP LABORATORY FIXTURE
2
3
4
8
7
6
5
COMP
V
FB
I
SENSE
R
T
C
T
V
REF
V
CC
OUTPUT
GROUND
0.1μF
0.1μF
A
SG1842/43
R
T
2N2222
100K
4.7K
1K
4.7K
5K
I
ADJUST
ERROR AMP
ADJUST
C
T
1K
GROUND
OUTPUT
V
CC
V
REF
1
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| SG1842_1 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:CURRENT MODE PWM CONTROLLER |
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| SG1842F/883B | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:CURRENT MODE PWM CONTROLLER |
| SG1842F/DESC | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:CURRENT MODE PWM CONTROLLER |
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