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  Microsemi Electronic Components Datasheet  

SG1843 Datasheet

CURRENT MODE PWM CONTROLLER

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SG1842/SG1843
Current Mode PWM Controller
Description
The SG1842/43 family of control IC's provides all the
necessary features to implement off-line fixed
frequency, current-mode switching power supplies
with a minimum number of external components.
Current-mode architecture demonstrates improved
line regulation, improved load regulation, pulse-by-
pulse current limiting and inherent protection of the
power supply output switch. The bandgap reference
is trimmed to ±1% over temperature.
Oscillator discharge current is trimmed to less than
±10%. The SG1842/43 has under-voltage lockout,
current limiting circuitry and start-up current of less
than 1mA. The totem-pole output is optimized to drive
the gate of a power MOSFET. The output is low in
the off state to provide direct interface to an
N-channel device. The SG1842/43 is specified for
operation over the full military ambient temperature
range of -55°C to 125°C. The SG2842/43 is specified
for the industrial range of -25°C to 85°C, and the
SG3842/43 is designed for the commercial range of
0°C to 70°C.
Product Highlight
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 (1A Peak)
Internally Trimmed Bandgap Reference
500kHz Operation
Undervoltage Lockout
SG1842 - 16 volts
SG1843 - 8.4 volts
Low Shoot-Through Current <75mA Over
Temperature
Application
Available To MIL-STD – 883, ¶ 1.2.1
Available to DSCC
- Standard Microcircuit Drawing (SMD)
AC
INPUT
RST
IST
Vcc
SG3842/43
October 2014 Rev. 1.7
Figure 1 · Product Highlight
www.microsemi.com
© 2014 Microsemi Corporation
1


  Microsemi Electronic Components Datasheet  

SG1843 Datasheet

CURRENT MODE PWM CONTROLLER

No Preview Available !

Current Mode PWM Controller
Connection Diagrams and Ordering Information
Ambient
Type
Temperature
Package
Part Number
Packaging
Type
Connection Diagram
0°C to 70°C
8-PIN PLASTIC
M DUAL INLINE
PACKAGE
-25°C to 85°C
SG3842M
SG3843M
SG2842M
SG2843M
Plastic DIP
COM
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
M PACKAGE
(Top View)
M Package: RoHS / Pb-free 100% Matte Tin Lead Finish
0°C to 70°C
-25°C to 85°C
-55°C to
125°C
MIL-STD/883
Y
8-PIN
CERAMIC
DUAL INLINE
PACKAGE
DESC
SG3842Y
SG3843Y
SG2842Y
SG2843Y
SG1842Y
SG1843Y
SG1842Y-883B
SG1843Y-883B
SG1842Y-DESC
SG1843Y-DESC
CERDIP
COM
VFB
ISENSE
RT/CT
VREF
VCC
OUTPUT
GND
Y PACKAGE
(Top View)
PbSn Tin Lead Finish
0°C to 70°C
DM
-25°C to 85°C
8-PIN SMALL
OUTLINE
INTEGRATED
CIRCUIT
SG3842DM
SG3843DM
SG2842DM
SG2843DM
SOIC
COM
VFB
ISENSE
VREF
VCC
OUTPUT
RT/CT
GND
DM PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
0°C to 70°C
D
-25°C to 85°C
14-PIN SMALL
OUTLINE
INTEGRATED
CIRCUIT
SG3842D
SG3843D
SG2842D
SG2843D
SOIC
COM
N.C.
VFB
N.C.
ISENSE
N.C.
RT/CT
VREF
N.C.
VCC
VC
OUTPUT
GND
PWR GND
D PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
0°C to 70°C
N
-25°C to 85°C
14-PIN DUAL
INLINE
PLASTIC
PACKAGE
SG3842N
SG3843N
SG2842N
SG2843N
PLASTIC
DIP
COM
N.C.
VFB
N.C.
ISENSE
N.C.
RT/CT
VREF
N.C.
VCC
VC
OUTPUT
GND
POWER GND
N PACKAGE
(Top View)
N Package: RoHS / Pb-free 100% Matte Tin Lead Finish
2


Part Number SG1843
Description CURRENT MODE PWM CONTROLLER
Maker Microsemi Corporation
Total Page 24 Pages
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