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PDF SC2603 Data sheet ( Hoja de datos )
| Número de pieza | SC2603 | |
| Descripción | Simple PWM Boost Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SC2603
Simple PWM Boost Controller
POWER MANAGEMENT
Description
Features
The SC2603 is a versatile, low-cost, voltage-mode PWM
controller designed for 16V input DC/DC power supply
applications. A simple, fixed-voltage boost regulator can
be implemented using the SC2603 with a minimum of
external components. The small device footprint
allows for compact circuit design.
SC2603 features include a temperature compensated
www.DatavSohleteatg4Ue.croemference, 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.
The SC2603 operates at a fixed frequency of 200kHz,
providing an optimum compromise between efficiency,
external component size, and cost.
Low cost / small size
Switch mode efficiency up to 95%
1% reference voltage accuracy
Over-current protection
800mA output drive
5V to 16V input power source
No need for external compensation network
SOT23-6 is fully WEEE and RoHS compliant
Applications
Portable Devices
Flat Panel TV
TV Set Top Box
Auxiliary Supplies
Peripheral Card Supplies
Industrial Power Supplies
High Density DC/DC Conversion
Typical Application Circuit
D1
L1
VIN
R1
C1
C3 D2
optional
Enable
O(oppeennDcraoilnlewctitohr)< 100Ω
pull down impedance
C4
U2
5 VIN Gate 4
3 EN/SS CS 6
1 FB GND 2
SC2603
Q1
R4
C5
R5
VOUT
R2
C2
GND
R3
Revision: Nov 14, 2006
1
www.semtech.com
1 page  
POWER MANAGEMENT
Application Information
Over Current Protection
The over-current protection is implemented by a sensing
resistor and an internal current-limit comparator with a
threshold of 70mV. If the switching current through the
sensing resistor causing voltage to drop at the CS pin
reachs 70mV, the SC2603 will immediately turn the gate
pulse off to limit the current through the power switch.
The figure below shows over-current waveforms. At t1,
www.DatatShheeeitn4Up.ucotmcurrent
I
IN
begins
to
increase
as
the
load
I
OUT
builds up until it hits the OCP threshold at t2. At t2, VOUT
begins to drop as IOUT starts increasing toward t3 while VIN
and I remain the same. At t3, there two events are
IN
happening. 1) V is at half of its regulating voltage. At
OUT
this point, the internal oscillator runs into frequency shift
mode and shifts the frequency to one fourth of the oper-
ating frequency. 2) The diode starts conducting current
without limit causing V to fall due to supply current limit.
IN
Finally, VIN and VOUT both drops to zero and IIN becomes the
input supply current limit.
A RC filter at the CS pin is necessary to filter out noise to
ensure accurate sensing.
The value of the sensing resistor can be caculated by
the following equation:
R S = 70 mV / I PEAK
Where I is the input peak current through the power
PEAK
MOSFET.
IIN
IOUT
VOUT
VIN
t0 t1
t2 t3
t4
Over Current Waveforms
© 2005 Semtech Corp.
5
SC2603
www.semtech.com
5 Page 
POWER MANAGEMENT
Outline Drawing - SOT23-6
A
2X E/2
N
ccc C
2X N/2 TIPS
12
B
e1 D
EI E
e
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 .035 - .057 0.90 - 1.45
A1 .000 - .006 0.00 - 0.15
A2 .035 .045 .051 .90 1.15 1.30
b .010 - .020 0.25 - 0.50
c .003 - .009 0.08 - 0.22
D .110 .114 .118 2.80 2.90 3.00
E1 .060 .063 .069 1.50 1.60 1.75
E .110 BSC
e .037 BSC
2.80 BSC
0.95 BSC
e1 .075 BSC
1.90 BSC
L .012 .018 .024 0.30 0.45 0.60
L1 (.024)
(0.60)
N6
6
01 0° - 10° 0°
- 10°
aaa .004
0.10
bbb .008
0.20
ccc .008
0.20
HH
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.
Land Pattern - SOT23-6
X DIMENSIONS
DIM INCHES MILLIMETERS
C (.098)
(2.50)
(C)
GZ
G .055
P .037
1.40
0.95
Y X .024 0.60
Y .043
1.10
P
Z .141
3.60
Contact Information
NOTES:
1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
www.DataSheet4U.com
© 2005 Semtech Corp.
11
SC2603
www.semtech.com
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SC2603.PDF ] | |
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