SG2842J 반도체 회로 부품 판매점
CURRENT MODE PWM CONTROLLER
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 Microsemi Corporation |
THE IN F I N I T E P O W E R OF IN N O VAT I O N
L I N D O C # : 1842
SG1842/SG1843 Series
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
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
TYPICAL APPLICATION OF SG3842 IN A FLYBACK CONVERTER
AC
INPUT
RST
IST
VCC
SG3842
KEY FEATURES
s OPTIMIZED FOR OFF-LINE CONTROL
s LOW START-UP CURRENT (<1mA)
s AUTOMATIC FEED FORWARD
COMPENSATION
s TRIMMED OSCILLATOR DISCHARGE
CURRENT
s PULSE-BY-PULSE CURRENT LIMITING
s ENHANCED LOAD RESPONSE
CHARACTERISTICS
s UNDER-VOLTAGE LOCKOUT WITH 6V
HYSTERESIS (SG1842 only)
s DOUBLE-PULSE SUPPRESSION
s HIGH-CURRENT TOTEM-POLE OUTPUT
(1AMP PEAK)
s INTERNALLY TRIMMED BANDGAP
REFERENCE
s 500KHZ OPERATION
s UNDERVOLTAGE LOCKOUT
SG1842 - 16 volts
SG1843 - 8.4 volts
s LOW SHOOT-THROUGH CURRENT <75mA
OVER TEMPERATURE
HIGH RELIABILITY FEATURES
s AVAILABLE TO MIL-STD-883B AND DESC
SMD
s SCHEDULED FOR MIL-M38510 QPL LISTING
s RADIATION DATA AVAILABLE
s LINFINITY LEVEL "S" PROCESSING AVAILABLE
TA (°C)
M
Plastic DIP
8-pin
0 to 70
SG3842M
SG3843M
-25 to 85
SG2842M
SG2843M
-55 to 125
—
—
MIL-STD/883
—
—
DESC
—
PACKAGE ORDER INFORMATION
N
Plastic DIP
14-pin
DM
Plastic
8-pin
SOIC
D
Plastic SOIC
14-pin
Y
Ceramic DIP
8-pin
J
Ceramic DIP
14-pin
F
Cer. Flatpack
10-pin
L
Ceramic LCC
20-pin
SG3842N
SG3842DM
SG3842D
SG3842Y
SG3842J
—
—
SG3843N
SG3843DM
SG3843D
SG3843Y
SG3843J
—
—
SG2842N
SG2842DM
SG2842D
SG2842Y
SG2842J
—
—
SG2843N
SG2843DM
SG2843D
SG2843Y
SG2843J
—
—
——
—
SG1842Y
SG1842J
— SG1842L
——
—
SG1843Y
SG1843J
— SG1843L
——
— SG1842Y/883B SG1842J/883B
— SG1842L/883B
——
— SG1843Y/883B SG1843J/883B
— SG1843L/883B
——
— SG1842Y/DESC SG1842J/DESC SG1842F/DESC SG1842L/DESC
— — SG1843Y/DESC SG1843J/DESC SG1843F/DESC SG1843L/DESC
Note: All surface-mount packages are available in Tape & Reel.
Copyright © 2000
Rev. 1.6 4/00
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
PRODUCT DATABOOK 1996/1997
SG1842/SG1843 Series
CURRENT-MODE PWM CONTROLLER
PRODUCTION DATA SHEET
A B S O L U T E M A X I M U M R AT I N G S (Notes 1 & 2)
Supply Voltage (ICC < 30mA) ............................................................... Self Limiting
Supply Voltage (Low Impedance Source) ........................................................ 30V
Output Current (Peak) ....................................................................................... ±1A
Output Current (Continuous) ....................................................................... 350mA
Output Energy (Capacitive Load) ....................................................................... 5µJ
Analog Inputs (Pins 2, 3) ................................................................. -0.3V to +6.3V
Error Amp Output Sink Current ..................................................................... 10mA
Power Dissipation at TA = 25°C (DIL-8) ............................................................ 1W
Operating Junction Temperature
Hermetic (J, Y, F, L Packages) ................................................................... 150°C
Plastic (N, M, D, DM Packages) ................................................................ 150°C
Storage Temperature Range .......................................................... -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) .................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device.
Note 2. All voltages are with respect to Pin 5. All currents are positive into the specified
terminal.
THERMAL DATA
M PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
N PACKAGE:
95°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DM PACKAGE:
65°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
D PACKAGE:
165°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
Y PACKAGE:
120°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
J PACKAGE:
130°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
F PACKAGE:
80°C/W
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
L PACKAGE:
80°C/W
145°C/W
THERMAL RESISTANCE-JUNCTION TO CASE, θJC
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
35°C/W
120°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
PACKAGE PIN OUTS
COMP
VFB
ISENSE
RT/CT
1
2
3
4
8 VREF
7 VCC
6 OUTPUT
5 GND
M & Y PACKAGE
(Top View)
COMP
VFB
ISENSE
RT/CT
1 8 VREF
2 7 VCC
3 6 OUTPUT
4 5 GND
DM PACKAGE
(Top View)
COMP
N.C.
VFB
N.C.
ISENSE
N.C.
RT/CT
1 14 VREF
2 13 N.C.
3 12 VCC
4 11 VC
5 10 OUTPUT
6 9 GND
7 8 PWR GND
D PACKAGE
(Top View)
COMP 1 14 VREF
N.C. 2 13 N.C.
VFB 3 12 VCC
N.C. 4 11 VC
ISENSE
5
10
OUTPUT
N.C. 6
9 GROUND
RT/CT
7
8 POWER GND
J & N PACKAGE
(Top View)
1. COMP
2. VFB
3. ISENSE
4. RT/CT
5. POWER GND
1 10
29
38
47
56
10. VREF
9. VCC
8. VC
7. OUTPUT
6. GND
F PACKAGE
(Top View)
3 2 1 20 19
1. N.C. 11. N.C.
2. COMP 12. GROUND
4 18 3. N.C. 13. N.C.
5 17 4. N.C. 14. N.C.
6
16
5. VFB
6. N.C.
15. OUTPUT
16. N.C.
7 15 7. ISENSE 17. VCC
8 14 8. N.C. 18. N.C.
9. N.C. 19. N.C.
9 10 11 12 13
10. RT/CT 20. VREF
L PACKAGE
(Top View)
2 Copyright © 2000
Rev. 1.6 4/00
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SG2842J controller
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