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參數(shù)資料
| 型號(hào)： | UC284XA |
| 廠(chǎng)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(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 242K |
| 代理商： | UC284XA |
C
U R R E N T
M
O D E
PWM C
O N T R O L L E R
UC184xA/284xA/384xA
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
7
Copyright 1995
Rev. 1.2 12/95
P
R O D U C T I O N
D
A T A
S
H E E T
TYPICAL APPLICATION 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
T
C
T
V
REF
V
CC
OUTPUT
GROUND
0.1μF
0.1μF
A
UCx84xA
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
OSCILLATOR
V
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
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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相關(guān)代理商/技術(shù)參數(shù) |
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| UC284XAD | 制造商:MICROSEMI 制造商全稱(chēng):Microsemi Corporation 功能描述:CURRENT MODEPWM CONTROLER |
| UC284XADM | 制造商:MICROSEMI 制造商全稱(chēng):Microsemi Corporation 功能描述:CURRENT MODEPWM CONTROLER |
| UC284XAM | 制造商:MICROSEMI 制造商全稱(chēng):Microsemi Corporation 功能描述:CURRENT MODEPWM CONTROLER |
| UC284XAY | 制造商:MICROSEMI 制造商全稱(chēng):Microsemi Corporation 功能描述:CURRENT MODEPWM CONTROLER |
| UC284XBD | 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS |
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