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PDF SG2825C Data sheet ( Hoja de datos )
| Número de pieza | SG2825C | |
| Descripción | HIGH - SPEED CURRENT - MODE PWM | |
| Fabricantes | LINFINITY | |
| Logotipo |  |
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THE I NFINITE POWER OF INNOVATION
L I N D O C #: 1825
SG1825C/SG2825C/SG3825C
HIGH-SPEED CURRENT-MODE PWM
NOT RECOMMENDED FOR NEW DESIGNS
DESCRIPTION
The SG1825C is a high-performance
pulse width modulator optimized for
high frequency current-mode power
supplies. Included in the controller
are a precision voltage reference,
micropower start-up circuitry, soft-
start, high-frequency oscillator,
wideband error amplifier, fast current-
limit comparator, full double-pulse
suppression logic, and dual totem-
pole output drivers. Innovative
circuit design and an advanced linear
Schottky process result in very short
propagation delays through the
current limit comparator, logic, and
output drivers. This device can be
used to implement either current-
mode or voltage-mode switching
power supplies. It also is useful as
a series-resonant controller to
frequencies beyond 1MHz. The
SG1825C is specified for operation
over the full military ambient tem-
perature range of -55°C to 125°C.
The SG2825C is characterized for the
industrial range of -25°C to 85°C,
and the SG3825C is selected for the
commercial range of 0°C to 70°C.
PRODUCT HIGHLIGHT
I N I T I A L O S C I L L ATOR A C C U R A C Y
15
Sample Size = 42579
Mean 4101.868671
Std. Dev. = 43.38
10
KEY FEATURES
s IMPROVED REFERENCE INITIAL
TOLERANCE (±1% max.)
s IMPROVED OSCILLATOR INITIAL
ACCURACY (±3% typ.)
s IMPROVED STARTUP CURRENT
(500µA typ.)
s PROP DELAY TO OUTPUTS (50ns typ.)
p 10V TO 30V OPERATION
p 5.1V REFERENCE TRIMMED TO ±1%
p 2MHZ OSCILLATOR CAPABILITY
p 1.5A PEAK TOTEM-POLE DRIVERS
p U.V. LOCKOUT WITH HYSTERESIS
p NO OUTPUT DRIVER "FLOAT"
p PROGRAMMABLE SOFTSTART
p DOUBLE-PULSE SUPPRESSION LOGIC
p WIDEBAND LOW-IMPEDANCE ERROR
AMPLIFIER
p CURRENT-MODE OR VOLTAGE-MODE
CONTROL
p WIDE CHOICE OF HIGH-FREQUENCY
PACKAGES
HIGH RELIABILITY FEATURES
s AVAILABLE TO MIL-STD-883B
s LINFINITY LEVEL "S" PROCESSING AVAIL.
5
0
390 395 400 405 410 415
Initial Oscillator Accuracy - KHz
TJ (°C)
N
Plastic DIP
16-pin
PACKAGE ORDER INFORMATION
DW
Plastic
16-pin
Wide
SOIC
Q
Plastic LCC
20-pin
J
Ceramic DIP
16-pin
L
Ceramic LCC
20-pin
0 to 70
SG3825CN
SG3825CDW
SG3825CQ
SG3825CJ
-25 to 85
SG2825CN
SG2825CDW
SG2825CQ
SG2825CJ
-55 to 125
SG1825CJ
SG1825CL
MIL-STD-883
SG1825CJ/883B
SG1825CL/883B
DESC
SG1825CJ/DESC
SG1825CL/DESC
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. SG3825CDWT)
Copyright © 1994
Rev. 1.3 6/96
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
1 page  
PRODUCT DATABOOK 1996/1997
SG1825C/SG2825C/SG3825C
HIGH-SPEED CURRENT-MODE PWM
NOT RECOMMENDED FOR NEW DESIGNS
BLOCK DIAGRAM
+9V
VREF
16
+VIN 15
GND 10
CLOCK 4
RT 5
CT 6
RAMP 7
E/A OUTPUT 3
N.I. INPUT 2
INV. INPUT 1
SOFTSTART 8
REFERENCE
REGULATOR
+ 4.0V
OSCILLATOR
1.25V
ERROR
9µA
S
RQ
Q
T
Q
FIGURE INDEX
Application Circuits
FIGURE #
1. HIGH-SPEED LAYOUT AND BYPASSING
2. MICROPOWER STARTUP
3. SOFTSTART FAST RESET
4. OSCILLATOR SYCHRONIZATION
5. OSCILLATOR FUNCTIONAL DIAGRAM
6. VOLTAGE AMPLIFIER CONNECTIONS
7. DRIVING SHIELDED CABLE
13 VC
11 OUTPUT A
14 OUTPUT B
12 POWER GND
+ 1.0V
+ 1.4V
9 ILIM/S.D.
Copyright © 1994
Rev. 1.3 6/96
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SG2825C.PDF ] | |
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