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
7) The Current Sense resistor and the divider across it
should form as small a loop as possible, the traces run-
ning back to CS(+) and CS(-) on the SC1101 should run
parallel and close to each other. The 0.1µF capacitor
should be mounted as close to the CS(+) and CS(-) pins
as possible.
8) To minimize noise pickup at the sensitive FB pin, the
feedback resistors should both be close to the SC1101
with the bottom resistor (Rb) returned to ground at the
GND pin.
Under Voltage Lockout
The under voltage lockout circuit of the SC1101 assures
that the high-side MOSFET driver outputs remain in the
off state whenever the supply voltage drops below set
parameters. Lockout occurs if VCC falls below 3.8V. Nor-
mal operation resumes once VCC rises above 3.8V.
TYPICAL APPLICATIONS
J1
1 +3.3V
C1
0.1uF
J3
1 GND
+
C3
220uF
+
C2
220uF
Q1
IRL2203S
J4
1 +12V
J6
1 +5V
R3
10
R5
R6
1k
1k
C2-C7 - AVX: TPSE227M010S0100
Q1, D1 - International Rectifier
L1- Coilcraft: DO5022P-392HC
C10
0.1uF
C9
0.1uF
L1
R1
6mOhm
D1
32CTQ030S
C4
220uF
+
C5
220uF
C6
0.1uF
+
U1
SC1101CS
1 VCC
2 CS(-)
3 CS(+)
4 PGND
GND 8
FB 7
BST 6
DH 5
Cx
0.01
C8
0.1uF
J2
VOUT 1
R2
24
C7
R4
0.01uF
124
J5
1
Fig. 6: GTL+ 3.3V to 1.5V 8A Application
© 2000 SEMTECH CORP.
6
652 MITCHELL ROAD NEWBURY PARK CA 91320
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