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PDF SC1104B Data sheet ( Hoja de datos )
| Número de pieza | SC1104B | |
| Descripción | (SC1104A/B) Synchronous Voltage Mode PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1104B (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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POWER MANAGEMENT
Description
SC1104A/B
Simple, Synchronous
Voltage Mode PWM Controller
Features
The SC1104A/B is a versatile voltage-mode PWM con-
troller designed for use in single ended DC/DC power
supply applications. A simple, fixed frequency high effi-
ciency buck regulator can be implemented using the
SC1104A/B 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.
SC1104A/B features include temperature compensated
voltage reference, triangle wave oscillator, current limit
comparator and an externally compensated error ampli-
fier. Current limit is implemented by sensing the voltage
drop across the top FET’s RDS(ON).
The SC1104 operates at fixed frequencies of
300kHz(A) or 600kHz(B) providing an optimum com-
promise between efficiency, external component size,
and cost. 600kHz switching frequency is reserved for
the SC1104B, +5VCC operation only.
Up to +14V input, 300kHz operation (SC1104A)
Up to +7V input, 600kHz operation (SC1104B)
High efficiency (>90%)
1% Reference voltage accuracy
Hiccup mode over current protection
Robust output drive
RDS(ON) Current sensing
Industrial temperature range
8-Lead SOIC package. Pb-free package available,
fully WEEE and RoHS compliant
Applications
Termination supplies
Low cost microprocessor supplies
Peripheral card supplies
Industrial power supplies
High density DC/DC conversion
SC1104A/B has a thermal protection circuit, which is
activated if the junction temperature exceeds 150°C.
Typical Application Circuit
Typical Distributed Power Supply
C1
510-1500pF
R1 C2
200-2k 0.01
1
U1
SC1104A/B
COMP/SS
SENSE
C3
1
8
2 GND
VCC 7
D1
MBRA130L
R3
1.00k
3 DL
PHASE
6
4 DH
BST 5
Q1
R6
1-5.1
Si4884DY
R7 Q2
1-5.1 Si4874DY
C9
0.1
D2
(opt)
R4
2.32k
+
C4 C5 C6 C7 Vin 5 to 12V
10.0
47/16V
47/16V
47/16V
_
R5
200-1k
C8
0.1-0.33
R8
opt
L1
1.5-6.8uH
C10
220/4V
C11
220/4V
C12
220/4V
C13
220/4V
+
C14-17
1.0
3.3V
_
Revision: November 22, 2006
Figure 1
1
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1 page  
SC1104A/B
POWER MANAGEMENT
Pin Configuration
Ordering Information
Top View
(8-Pin SOIC)
Pin Descriptions
Device (2)
SC1104XISTR (1)
SC1104XISTRT (1)(3)
Package
SOIC-8
Temp Range (TJ)
-40° to 125°C
SC1104XEVB Evaluation Board
Notes:
(1) In place of “X”: A = 300kHz, VCC = 5V to 12V.
B = 600kHz, VCC = 5V.
(2) Only available in tape and reel packaging. A reel
contains 2500 devices.
(3) Lead free product. This product is fully WEEE and
RoHS compliant.
Pin
#
Pin Name
Pin Function
1
COMP/SS
Error amplifier output. Compensation, soft start/enable.
2
GND
Ground.
3 DL Low side driver output
4 DH High side driver output
5
BST
Bootstrap, high side driver.
6
PHASE
Input from the phase node between the MOSFETs.
7
VCC
Chip bias supply voltage.
8
SENSE
Output voltage sense input.
Marking Information
© 2006 Semtech Corp.
yyww = Date Code (Example: 0012)
xxxxxxxx = Semtech Lot No. (Example: E90101-1)
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Evaluation PC Board
SC1104A/B
Top View
Top Layer
© 2006 Semtech Corp.
Bottom Layer
11
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC1104B.PDF ] | |
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