SC1101(2000) 데이터 시트보기 (PDF) - Semtech Corporation
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SC1101 Datasheet PDF : 8 Pages
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VOLTAGE MODE PWM CONTROLLER
SC1101
February 29, 2000
ELECTRICAL CHARACTERISTICS
VCC = 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
Reference
VREF
1.238
1.250
1.263
Over Temp
1.225
1.250
1.275
Feedback Bias Current
IFB
2.0
8.0
Quiescent Current
IQ
Current into VCC pin
5.0
8.0
Regulation Load
REGLOAD
IO=1A to 12A
0.5
1.0
Regulation Line
REGLINE
0.5
Current Limit Threshold
CLT
CS(+) to CS(-)
60
70
80
Oscillator Frequency
OSC
180
200
220
Oscillator Frequency Shift
Max Duty Cycle
OFS
d.c.
VFB < VREF/2
50
90
95
DH Sink/Source Current
IO
VBST - VDH = 4.5V
500
(VDH - VPGND = 2V)
UVLO Threshold
VUVLO
3.8
UNITS
V
V
uA
mA
%
%
mV
kHz
kHz
%
mA
V
TEST CIRCUIT
J1
+5V
C1
0.1uF
J3
+
C3
1500uF
+
+
C2
1500uF
C4
1500uF
Q1
D1
PSR16C30CT
L1
BUK556
4uH
R2
10
J4
+12V
R1
5mOhm
C6
1500uF
C8
1500uF
+
+
C9
0.1uF
+
+
C5
1500uF
C7
1500uF
R3
See Table
R4
See Table
J2
VOUT
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
R5
1.00k
R6
2.32k
C11
0.1uF
C10
0.1uF
U1
1 VCC
2 CS(-)
3 CS(+)
4 PGND
GND 8
FB 7
BST 6
DH 5
SC1101CS
VOUT=1.25*(R3+R4)/R4
© 2000 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320
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