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PDF SG1843 Data sheet ( Hoja de datos )
| Número de pieza | SG1843 | |
| Descripción | CURRENT MODE PWM CONTROLLER | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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SG1842/SG1843 Series
TM ® C U R R E N T M O D E P W M C O N T R O L L E R
PRODUCTION DATA SHEET
DESCRIPTION
The SG1842/43 family of control IC's provides all lockout, current limiting circuitry and start-up
the necessary features to implement off-line fixed current of less than 1mA. The totem-pole output
frequency, current-mode switching power supplies is optimized to drive the gate of a power
with a minimum number of external components. MOSFET. The output is low in the off state to
Current-mode architecture demonstrates improved provide direct interface to an N channel device.
line regulation, improved load regulation, pulse- The SG1842/43 is specified for operation over
by-pulse current limiting and inherent protection the full military ambient temperature range of -
of the power supply output switch. The bandgap 55°C to 125°C. The SG2842/43 is specified for
reference is trimmed to ±1% over temperature. the industrial range of -25°C to 85°C, and the
Oscillator discharge current is trimmed to less SG3842/43 is designed for the commercial range
than ±10%. The SG1842/43 has under-voltage of 0°C to 70°C.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
AC
INPUT
RST
IST
VCC
SG3842
KEY FEATURES
OPTIMIZED FOR OFF-LINE
CONTROL
LOW START-UP CURRENT (<1mA)
AUTOMATIC FEED FORWARD
COMPENSATION
TRIMMED OSCILLATOR
DISCHARGE CURRENT
PULSE-BY-PULSE CURRENT
LIMITING
ENHANCED LOAD RESPONSE
CHARACTERISTICS
UNDER-VOLTAGE LOCKOUT
WITH 6V HYSTERESIS (SG1842
only)
DOUBLE-PULSE SUPPRESSION
HIGH-CURRENT TOTEM-POLE
OUTPUT (1AMP PEAK)
INTERNALLY TRIMMED BANDGAP
REFERENCE
500KHZ OPERATION
UNDERVOLTAGE LOCKOUT
SG1842 - 16 volts
SG1843 - 8.4 volts
LOW SHOOT-THROUGH
CURRENT <75mA OVER
TEMPERATURE
HIGH RELIABILITY
FEATURES
AVAILABLE TO MIL-STD-883B AND
DSCC
SCHEDULED FOR MIL-M38510
QPL LISTING
RADIATION DATA AVAILABLE
Microsemi LEVEL "S" PROCESSING
AVAILABLE
Plastic DIP
Plastic DIP
TA (°C) M 8-Pin
N 14-Pin
RoHS / Pb-free Transition DC: 0503
0 to 70
SG3842M
SG3843M
SG3842N
SG3843N
-25 to 85
SG2842M
SG2843M
SG2842N
SG2843N
-55 to
125
MIL-
STD/883
DESC
PACKAGE ORDER INFO
Plastic SOIC
Plastic SOIC
Ceramic Dip
DM 8-Pin
D 14-Pin
Y 8-Pin
RoHS / Pb-free Transition DC:0440
SG3842DM
SG3842D
SG3843DM
SG3843D
SG3842Y
SG3843Y
SG2842DM
SG2843DM
SG2842D
SG2843D
SG2842Y
SG2843Y
SG1842Y
SG1843Y
SG1842Y/883B
SG1843Y/883B
SG1842Y/DESC
SG1843Y/DESC
Ceramic DIP
J 14-Pin
SG3842J
SG3842J
SG2842J
SG2843J
SG1842J
SG1843J
SG1842J/883B
SG1843J/883B
SG1842J/DESC
SG1843J/DESC
Cer Flatpack
Ceramic LCC
F 10-Pin
L 20-Pin
SG1842F
SG1843F
SG1842F/883B
SG1843F/883B
SG1842F/DESC
SG1843F/DESC
SG1842L
SG1842L
SG1842L/883B
SG1843L/883B
SG1842L/DESC
SG1843L/DESC
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. SG2843DM-TR)
Plastic packages are RoHS compliant
Copyright © 2000
Rev. 1.6b 2010-03-15
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
1
1 page  
PRODUCT DATABOOK 1996/1997
SG1842/SG1843 Series
CURRENT-MODE PWM CONTROLLER
PRODUCTION DATA SHEET
VCC*
GROUND**
RT/CT
BLOCK DIAGRAM
34V
16V (1842)
8.4V (1843)
2.5V
UVLO
6V (1842)
0.8V (1843)
S/R
5V
REF
OSCILLATOR
VREF
GOOD LOGIC
INTERNAL
BIAS
VFB
COMP
CURRENT SENSE
ERROR AMP
2R S
1V
R
R PWM
LATCH
CURRENT SENSE
COMPARATOR
*-
V and V are internally connected for 8 pin packages.
CC C
** - POWER GROUND and GROUND are internally connected for 8 pin packages.
VREF
5.0V
50mA
VC*
OUTPUT
POWER GROUND**
Copyright © 2000
Rev. 1.6a 10/04
5
5 Page 
PRODUCT DATABOOK 1996/1997
SG1842/SG1843 Series
CURRENT-MODE PWM CONTROLLER
PRODUCTION DATA SHEET
TYPICAL APPLICATION CIRCUITS
Pin numbers referenced are for 8-pin package and pin numbers in parenthesis are for 14-pin package.
VCC VIN
VIN VCC
7 (12)
7 (12)
7 (11)
Q1
6 (10)
SG1842/43
5 (8)
R
3 (5)
C
RS
IPK
IPK(MAX)
=
1.0V
RS
SG1842/43
7 (11)
6 (10)
R1
Q1
5 (8)
3 (5)
RS
FIGURE 15. — CURRENT-SENSE SPIKE SUPPRESSION
The RC low pass filter will eliminate the leading edge current spike
caused by parasitics of Power MOSFET.
IB
VC +
» R2
VC1
» R1||R2 _
VC
SG1842/43
7 (11)
R2
6 (10)
VC1
C1
R1
5 (8)
3 (5)
VIN
Q1
RS
FIGURE 17. — BIPOLAR TRANSISTOR DRIVE
The 1842/43 output stage can provide negative base current to
remove base charge of power transistor (Q1) for faster turn off. This
is accomplished by adding a capacitor (C1) in parallel with a resistor
(R1). The resistor (R1) is to limit the base current during turn on.
FIGURE 16. — MOSFET PARASITIC OSCILLATIONS
A resistor (R1) in series with the MOSFET gate reduce overshoot and
ringing caused by the MOSFET input capacitance and any induc-
tance in series with the gate drive. (Note: It is very important to
have a low inductance ground path to insure correct operation of
the I.C. This can be done by making the ground paths as short and
as wide as possible.)
VCC
7 (12)
Isolation
Boundary
7 (11)
6 (10)
SG1842/43
5 (8)
3 (5)
R
C
RS
VIN
Q1
Waveforms
+
0_
50% DC
+
0_
NS NP 25% DC
V (PIN 1) - 1.4
IPK =
3RS
NP
NS
FIGURE 18. — ISOLATED MOSFET DRIVE
Current transformers can be used where isolation is required
between PWM and Primary ground. A drive transformer is then
necessary to interface the PWM output with the MOSFET.
Copyright © 2000
Rev. 1.6a 10/04
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SG1843.PDF ] | |
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