參數(shù)資料
型號： SC1103CS
廠商： Semtech Corporation
英文描述： VOLTAGE MODE PWM CONTROLLER
中文描述： 電壓模式PWM控制器
文件頁數(shù)： 3/8頁
文件大小： 97K
代理商： SC1103CS
SC1103
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA
VOLTAGE MODE PWM CONTROLLER
PRELIMINARY - February 29, 2000
3
TEST CIRCUIT
ELECTRICAL CHARACTERISTICS
V
= 11.50V to 12.50V; GND = P
= 0V; V
O
= 3.3V; T
A
= 25°C; BST = 24+1V; Output current = 2A.
Per test circuit, unless otherwise specified.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Reference
V
REF
1.238
1.250
1.263
V
Over Temp
1.225
1.250
1.275
V
Feedback Bias Current
I
FB
2.0
8.0
uA
Quiescent Current
I
Q
Current into V
CC
pin
5.0
8.0
mA
Regulation Load
REG
LOAD
I
O
= 1A to 10A
0.5
1.0
%
Regulation Line
REG
LINE
I
O
= 10A
0.5
%
Current Limit Threshold
CLT
CS(+) to CS(-)
60
70
80
mV
Oscillator Frequency
OSC
180
200
220
kHz
Oscillator Frequency Shift
OFS
V
FB
< V
REF
/2
50
kHz
Max Duty Cycle
d.c.
90
95
%
DH Sink/Source Current
I
O
V
BST
- V
DH
= 4.5V
(V
DH
- V
PGND
= 2V)
500
mA
UVLO Threshold
V
UVLO
3.8
V
Q1
IRL3103S
R4
2.7
R2
1k
MBRBD1
R1
10
L1
5.6uH
C9
C10
C11
C3
C2
C4
C6
0.1
R7
124
R6
C1
0.1
C7
Vout(+)
+12V
GND
C8
0.1
C12
0.1
R5
0.01
R3
1k
Vout(-)
VCC
1
Cs(-)
2
Cs(+)
3
PGND
4
DH
5
BST
6
FB
7
GND
8
U1
* NOTE: R6 = 124 x (Vout/1.25 - 1) rounded to nearest 1%value
C5
0.1
+ 20 to 24V
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