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參數(shù)資料
| 型號： | SG3842DM |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | CURRENT MODE PWM CONTROLLER |
| 中文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SG3842DM |
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
Copyright 2000
Rev. 1.6 4/00
12
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 20.
— EXTERNAL DUTY CYCLE CLAMP AND
MULTI-UNIT SYNCHRONIZATION
FIGURE 19.
— ADJUSTABLE BUFFERED REDUCTION OF CLAMP LEVEL
WITH SOFTSTART
Precision duty cycle limiting as well as synchronizing several 1842/
1843's is possible with the above circuitry.
Softstart and adjustable peak current can be done with the external
circuitry shown above.
t
SOFTSTART
= -ln 1 -
C
where; V
≡
voltage at the Error Amp Output under
minimum line and maximum load conditions.
I
PK
=
Where: V
CS
= 1.67
and V
C.S.MAX
= 1V (Typ.)
7 (12)
6 (10)
7 (11)
5 (8)
3 (5)
SG1842/43
V
CC
V
IN
Q1
I
V
CS
R
S
5 (9)
8 (14)
4 (7)
2 (3)
1 (1)
MPSA63
R
2
R
1
1
C
2
6
R
B
R
A
1
8
4
3
555
TIMER
4 (7)
5 (9)
8 (14)
SG1842/43
To other
SGX842/43
FIGURE 22.
— ERROR AMPLIFIER CONNECTION
FIGURE 21.
— OSCILLATOR CONNECTION
8 (14)
4 (7)
5V
C
T
2.8V
1.1V
SG1842/43
Discharge
Current
I
d
= 8.2mA
R
T
1 (1)
R
F
R
i
2 (3)
R
F
10K
2.5V
SG1842/43
0.5mA
The oscillator is programmed by the values selected for the timing
components R
and C
. Refer to application information for
calculation of the component values.
Error amplifier is capable of sourcing and sinking current up to 0.5mA.
R
1
R
2
R
1
+R
2
V
EAO
- 1.3
5
R
1
+R
2
R
1
R
1
R
1
+R
2
f =(R
A
+ 2R
B
)C
R
1.44
f =R
A
+ 2R
B
V
CS
R
S
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