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SC1101CS 데이터시트 PDF




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부품번호 SC1101CS 기능
기능 Asynchronous Voltage Mode PWM Controller
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SC1101CS 데이터시트, 핀배열, 회로
POWER MANAGEMENT
Description
The SC1101 is a versatile, low-cost, voltage-mode PWM
controller designed for low output voltage DC/DC power
supply applications. A simple, fixed-voltage buck
regulator can be implemented using the SC1101 with a
minimum of external components. Internal level shift and
drive circuitry eliminates the need for an expensive
p-channel, high-side switch. The small device footprint
allows for compact circuit design.
SC1101
Asynchronous Voltage
Mode PWM Controller
Features
‹ Low cost / small size
‹ Switch mode efficiency up to 95%
‹ 1% reference voltage accuracy
‹ Over current protection
‹ 500mA output drive
‹ SO-8 package
SC1101 features include a temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator, frequency shift over-current protection, and
an internally compensated error amplifier. Pulse by pulse
current limiting is implemented by sensing the
differential voltage across an external resistor, or an
appropriately sized PC board trace.
Applications
‹ Pentium® P55 Core Supply
‹ Low Cost Microprocessor Supplies
‹ Peripheral Card Supplies
‹ Industrial Power Supplies
‹ High Density DC/DC Conversion
The SC1101 operates at a fixed frequency of 200kHz,
providing an optimum compromise between efficiency,
external component size, and cost.
Typical Application Circuit
+5V
Q1
IRLR3103
L1 R5
4uH 0.05
GND
C1
1.0
C2
C3
150/6.3V 150/6.3V
D2
MBRD1035L
+12V
R1
10
C4
0.1
R2 R3
1k 1k
U1
SC1101
C6
1 VCC
GND 8
0.01
C5
0.001
2 CS(-)
3 CS(+)
4 PGND
FB 7
BST 6
DH 5
C7
0.1
R4
2.2
* NOTE:
R6 = R7 x (Vout/1.25 - 1) rounded to nearest 1%value
Vout = 2V @ 10A
+
C8 C9 C10 C11
330/2.5V 330/2.5V 330/2.5V 1.0
R6
76.8 *see note
R7
127
GND
Revision: May 25, 2005
1
www.semtech.com




SC1101CS pdf, 반도체, 판매, 대치품
SC1101
POWER MANAGEMENT
Applications Information
Layout Guidelines
Careful attention to layout requirements are necessary
for successful implementation of the SC1101 PWM
controller. High currents switching at 200kHz are present
in the application and their effect on ground plane volt-
age differentials must be understood and minimized.
1). The high power parts of the circuit should be laid out
first. A ground plane should be used, the number and
position of ground plane interruptions should be such as
to not unnecessarily compromise ground plane integrity.
Isolated or semi-isolated areas of the ground plane may
be deliberately introduced to constrain ground currents
to particular areas, for example the input capacitor and
bottom Schottky ground.
rents are supplied by Cout only, and connections between
Cout and the load must be short, wide copper areas to
minimize inductance and resistance.
5) The SC1101 is best placed over an isolated ground
plane area. GND and PGND should be returned to this
isolated ground. This isolated ground area should be con-
nected to the main ground by a trace that runs from the
GND pin to the ground side of (one of) the output
capacitor(s). If this is not possible, the GND pin may be
connected to the ground path between the Output
Capacitor(s) and the Cin, Q1, D1 loop. Under no circum-
stances should GND be returned to a ground inside the
Cin, Q1, D1 loop.
2). The loop formed by the Input Capacitor(s) (Cin), the
Top FET (Q1) and the Schottky (D1) must be kept as small
as possible. This loop contains all the high current, fast
transition switching. Connections should be as wide and
as short as possible to minimize loop inductance. Mini-
mizing this loop area will reduce EMI, lower ground injec-
tion currents, resulting in electrically “cleaner” grounds
for the rest of the system and minimize source ringing,
resulting in more reliable gate switching signals.
6) Vcc for the SC1101 should be supplied from the 5V
supply through a 10resistor, the Vcc pin should be
decoupled directly to GND by a 0.1µF ceramic capacitor,
trace lengths should be as short as possible.
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.
3). The connection between the junction of Q1, D1 and
the output inductor should be a wide trace or copper
region. It should be as short as practical. Since this con-
nection has fast voltage transitions, keeping this con-
nection short will minimize EMI. The connection between
the output inductor and the sense resistor should be a
wide trace or copper area, there are no fast voltage or
current transitions in this connection and length is not
so important, however adding unnecessary impedance
will reduce efficiency.
4) The Output Capacitor(s) (Cout) should be located as
close to the load as possible, fast transient load cur-
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.
2005 Semtech Corp.
4
www.semtech.com

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SC1101CS 전자부품, 판매, 대치품
POWER MANAGEMENT
Outline Drawing - SO-8
2X E/2
A
N
eD
E1 E
12
ccc C
2X N/2 TIPS
e/2
B
aaa C
SEATING
PLANE
C
D
A2 A
A1
bxN
bbb C A-B D
DIMENSIONS
DIM
INCHES
MIN NOM MAX
MILLIMETERS
MIN NOM MAX
A .053 - .069 1.35 - 1.75
A1 .004 - .010 0.10 - 0.25
A2 .049 - .065 1.25 - 1.65
b .012 - .020 0.31 - 0.51
c .007 - .010 0.17 - 0.25
D .189 .193 .197 4.80 4.90 5.00
E1 .150 .154 .157 3.80 3.90 4.00
E .236 BSC
6.00 BSC
e .050 BSC
1.27 BSC
h .010 - .020 0.25 - 0.50
L .016 .028 .041 0.40 0.72 1.04
L1 (.041)
(1.04)
N8
8
01 0° - 8° 0° - 8°
aaa .004
0.10
bbb .010
0.25
ccc .008
0.20
h
h
H
GAGE
PLANE
c
SIDE VIEW
0.25
SEE DETAIL A
L
(L1)
DETAIL A
01
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MS-012, VARIATION AA.
Minimum Land Pattern - SO-8
X
(C)
P
GZ
Y
DIM
C
G
P
X
Y
Z
DIMENSIONS
INCHES MILLIMETERS
(.205)
(5.20)
.118 3.00
.050 1.27
.024 0.60
.087 2.20
.291 7.40
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
2005 Semtech Corp.
7
SC1101
www.semtech.com

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부품번호상세설명 및 기능제조사
SC1101CS

Asynchronous Voltage Mode PWM Controller

Semtech Corporation
Semtech Corporation

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