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SC1101CS Scheda tecnica(PDF) 3 Page - Semtech Corporation

Il numero della parte SC1101CS
Spiegazioni elettronici  VOLTAGE MODE PWM CONTROLLER
PDF  8 Pages
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Produttore elettronici  SEMTECH [Semtech Corporation]
Homepage  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC1101CS Scheda tecnica(HTML) 3 Page - Semtech Corporation

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SC1101
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VOLTAGE MODE PWM CONTROLLER
February 29, 2000
3
TEST CIRCUIT
VOUT=1.25*(R3+R4)/R4
+5V
+12V
VOUT
C9
0.1uF
C1
0.1uF
Q1
BUK556
L1
4uH
R6
2.32k
R5
1.00k
R1
5mOhm
D1
PSR16C30CT
R2
10
C11
0.1uF
C10
0.1uF
U1
SC1101CS
GND
8
VCC
1
CS(-)
2
CS(+)
3
PGND
4
DH
5
BST
6
FB
7
R3
See Table
R4
See Table
+
C5
1500uF
+
C6
1500uF
+
C7
1500uF
+
C8
1500uF
+
C4
1500uF
+
C3
1500uF
+
C2
1500uF
J1
J2
J3
J4
VOUT R3
R4
3.45
174
100
3.30
165
100
3.10
147
100
2.90
133
100
2.80
124
100
2.50
100
100
1.50
20
100
ELECTRICAL CHARACTERISTICS
V
CC = 4.75V to 5.25V; GND = PGND = 0V; VO = 3.3V; TA = 25°C; BST = 12V; 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 12A
0.5
1.0
%
Regulation Line
REG
LINE
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 < VREF/2
50
kHz
Max Duty Cycle
d.c.
90
95
%
DH Sink/Source Current
I
O
V
BST - VDH = 4.5V
(V
DH - VPGND = 2V)
500
mA
UVLO Threshold
V
UVLO
3.8
V



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