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PDF SC2612E Data sheet ( Hoja de datos )

Número de pieza SC2612E
Descripción 500kHz Step-Down DC/DC Converter
Fabricantes Semtech 
Logotipo Semtech Logotipo



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No Preview Available ! SC2612E Hoja de datos, Descripción, Manual

SC2612E
500kHz Step-Down DCw/wDw.DCataCShoeent4Uv.ceomrter
POWER MANAGEMENT
Description
Features
The SC2612E is a voltage mode switcher designed for
low cost, “point of use” voltage conversion. SC2612E is
available with fixed switching frequencies of 500kHz.
The SC2612E has soft start and enable functions and is
short circuit protected. The output of the switcher may
be set anywhere between 0.8V and 75% of Vin. Short
circuit protection is disabled during start-up to allow the
output capacitors time to fully charge.
u Operating frequency of 500kHz
u Input supply of 4.5V to 15V
u 0.5A Drive current for up to 10A output
u Output voltages down to 0.8V
u Overcurrent protection and soft start
u SO-8 package
Applications
u Graphics IC Power supplies
u Embedded, low cost, high efficiency converters
Typical Application Circuit
5V IN
R1
C5
C7
C9
R9
12V IN
C10 C1
C2
U2
2 VCC BST
7 COMP DH
8 SS/EN DL
4 GND
FB
SC2612E
6
5
3
1
R2
R3
Q2
L1
Q3
C3
1.5V OUT
R6
R10
Revision: October 12, 2004
1
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1 page




SC2612E pdf
SC2612E
POWER MANAGEMENT
Theory of Operation
Component Selection
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The SC2612E is a step down DC/DC controller designed
for minimum cost and size without sacrificing accuracy
and protection. Overcurrent protection is implemented
by a simple undervoltage detection scheme and is dis-
abled until soft start has been completed to eliminate
false trips due to output capacitor charging. The SS/EN
pin is held low, as are the DH and DL pins, until the
undervoltage lockout points are exceeded. Once the VCC
and BST pins both rise above their undervoltage lockout
points, the SS capacitor begins to charge, controlling the
duty cycle of the switcher, and therefore slowly ramping
up the switcher output voltage. Once the SS capacitor is
charged, the current limit circuitry is enabled. If a short
circuit is applied , the output will be pulled down below
it’s trip point and shut down. The device may be restarted
by either cycling power, or momentarily pulling SS/EN low.
OUTPUT INDUCTOR - A good starting point for output
filter component selection is to choose an inductor value
that will give an inductor ripple current of approximately
20% of max. output current.
Inductor ripple current is given by:-
ILRIPPLE
=
VO
× ççèæ1 -
VO
VIN
L × fOSC
÷÷øö
So choose inductor value from:-
L
=
5×
VO
×
ççèæ1
-
VO
VIN
IO × fOSC
÷÷øö
OUTPUT CAPACITOR(S) - The output capacitors should
be selected to meet output ripple and transient response
criteria. Output ripple voltage is caused by the inductor
ripple current flowing in the output capacitor’s ESR (There
is also a component due to the inductor ripple current
charging and discharging the output capacitor itself, but
this component is usually small and can often be ignored).
Given a maximum output voltage ripple requirement, ESR
is given by:-
RESR
<
VO
× VRIPPLE × ççèæ1 -
L × fOSC
VO
VIN
÷÷øö
Output voltage transient excursions are a function of load
current transient levels, input and output voltages and
inductor and capacitor values.
Capacitance and RESR values to meet a required tran-
sient condition can be calculated from:-
RESR
<
VT
IT
C
>
L × IT2
2 × VT × VA
where
VA = VIN - VO for negative transients (load application)
and
VA = VO for positive transients (load release)
values for positive and negative transients must be cal-
culated seperately and the worst case value chosen. For
Capacitor values, the calculated value should be doubled
to allow for duty cycle limitation and voltage drop issues.
2004 Semtech Corp.
5
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SC2612E arduino
SC2612E
POWER MANAGEMENT
Outline Drawing - SOIC-8
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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.
Land Pattern - SOIC-8
X
DIMENSIONS
DIM INCHES MILLIMETERS
C (.205)
(5.20)
(C)
GZ
G .118
3.00
P .050
1.27
X .024
0.60
Y
Y .087
2.20
Z .291
7.40
P
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.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
Semtech Corporation
Power Management Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
2004 Semtech Corp.
11
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