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PWM CONTROLLER. SG1843 Datasheet

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PWM CONTROLLER. SG1843 Datasheet






SG1843 CONTROLLER. Datasheet pdf. Equivalent




SG1843 CONTROLLER. Datasheet pdf. Equivalent





Part

SG1843

Description

CURRENT MODE PWM CONTROLLER



Feature


L I N D O C # : 1842 SG1842/SG1843 Seri es CURRENT MODE PWM CONTROLLER T H E I N F I N I T E P O W E R O F I N N O VA T I O N P R O D U C T I O N D A T A S H E E T DESCRIPTION The SG 1842/43 family of control IC's provides all the necessary features to implemen t off-line fixed frequency, current-mod e switching power supplies with a minim um number of exter.
Manufacture

Linfinity

Datasheet
Download SG1843 Datasheet


Linfinity SG1843

SG1843; nal components. Current-mode architectur e demonstrates improved line regulation , improved load regulation, pulse-by-pu lse current limiting and inherent prote ction of the power supply output switch . The bandgap reference is trimmed to 1% over temperature. Oscillator discha rge current is trimmed to less than ±1 0%. The SG1842/43 has undervoltage lock out, current limitin.


Linfinity SG1843

g circuitry and start-up current of less than 1mA. The totem-pole output is opt imized to drive the gate of a power MOS FET. The output is low in the off state to provide direct interface to an N ch annel device. The SG1842/43 is specifie d for operation over the full military ambient temperature range of -55°C to 125°C. The SG2842/43 is specified for the industrial range.


Linfinity SG1843

of -25°C to 85°C, and the SG3842/43 i s designed for the commercial range of 0°C to 70°C. K E Y F E AT U R E S s OPTIMIZED FOR OFF-LINE CONTROL s LOW ST ART-UP CURRENT (<1mA) s AUTOMATIC FEED FORWARD COMPENSATION s TRIMMED OSCILLAT OR DISCHARGE CURRENT s PULSE-BY-PULSE C URRENT LIMITING s ENHANCED LOAD RESPONS E CHARACTERISTICS s UNDER-VOLTAGE LOCKO UT WITH 6V HYSTERESIS .

Part

SG1843

Description

CURRENT MODE PWM CONTROLLER



Feature


L I N D O C # : 1842 SG1842/SG1843 Seri es CURRENT MODE PWM CONTROLLER T H E I N F I N I T E P O W E R O F I N N O VA T I O N P R O D U C T I O N D A T A S H E E T DESCRIPTION The SG 1842/43 family of control IC's provides all the necessary features to implemen t off-line fixed frequency, current-mod e switching power supplies with a minim um number of exter.
Manufacture

Linfinity

Datasheet
Download SG1843 Datasheet




 SG1843
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




 SG1843
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




 SG1843
PRODUCT DATABOOK 1996/1997
SG1842/SG1843 Series
CURRENT-MODE PWM CONTROLLER
PRODUCTION DATA SHEET
R E C O M M E N D E D O P E R A T I N G C O N D I T I O N S (Note 3)
Parameter
Symbol
Recommended Operating Conditions
Min. Typ. Max.
Supply Voltage Range
Output Current (Peak)
Output Current (Continuous)
Analog Inputs (Pin 2, Pin 3)
Error Amp Output Sink Current
Oscillator Frequency Range
Oscillator Timing Resistor
Oscillator Timing Capacitor
Operating Ambient Temperature Range:
SG1842/43
SG2842/43
SG3842/43
Note 3. Range over which the device is functional.
30
±1
200
0 2.6
5
0.1 500
RT 0.52
CT 0.001
150
1.0
-55 125
-25 85
0 70
Units
V
A
mA
V
mA
kHz
K
µF
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1842/SG1843 with -55°C TA 125°C, SG2842/
SG2843 with -25°C TA 85°C, SG3842/SG3843 with 0°C TA 70°C, VCC = 15V (Note 7), RT = 10k, and CT = 3.3nF. Low duty cycle pulse testing
techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Reference Section
Output Voltage
Line Regulation
Load Regulation
Temperature Stability (Note 4)
Total Output Variation (Note 4)
Output Noise Voltage (Note 4)
Long Term Stability (Note 4)
Output Short Circuit
Oscillator Section
Initial Accuracy
Voltage Stability
Temperature Stability (Note 4)
Amplitude
Discharge Current
Error Amp Section
Input Voltage
Input Bias Current
Open Loop Gain
Unity Gain Bandwidth (Note 4)
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
VOUT High
VOUT Low
Symbol Test Conditions
SG1842/43
SG2842/43
SG3842/43 Units
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
TJ = 25°C, IO = 1mA
12 VIN 25V
1 IO 20mA
4.95 5.00 5.05 4.95 5.00 5.05 4.90 5.00 5.10
6 20
6 20
6 20
6 25
6 25
6 25
0.2 0.4
0.2 0.4
0.2 0.4
V
mV
mV
mV/°C
Line, Load, Temp.
4.90 5.10 4.90 5.10 4.82 5.18 V
VN 10Hz f 10kHz, TJ = 25°C
50
50
50 µV
TA = 125°C, 1000hrs
5 25
5 25
5 25 mV
-30 -100 -180 -30 -100 -180 -30 -100 -180 mA
TJ = 25°C
12 VCC 25V
TMIN TA TMAX
VRT/CT (Peak to Peak)
TJ = 25°C
TMIN TA TMAX
47 52 57 47 52 57 47 52 57
0.2 1
0.2 1
0.2 1
555
1.7 1.7 1.7
7.8 8.3 8.8 7.5 8.4 9.3 7.5 8.4 9.3
7.0 9.0 7.2 9.5 7.2 9.5
kHz
%
%
V
mA
mA
VCOMP = 2.5V
2.45 2.50 2.55 2.45 2.50
-0.3 -1
-0.3
AVOL
PSRR
2 VO 4V
TJ = 25°C
12 VCC 25V
VVFB = 2.7V, VCOMP = 1.1V
VVFB = 2.3V, VCOMP = 5V
VVFB = 2.3V, RL = 15K to gnd
VVFB = 2.7V, RL = 15K to VREF
65 90
65 90
0.7 1
0.7 1
60 70
60 70
26
26
-0.5 -0.8
-0.5 -0.8
56
56
0.7 1.1
0.7
(Electrical Characteristics continue next page.)
2.55
1
1.1
2.42
65
0.7
60
2
-0.5
5
2.50
-0.3
90
1
70
6
-0.8
6
0.7
2.58
-2
1.1
V
µA
dB
MHz
dB
mA
mA
V
V
Copyright © 2000
Rev. 1.6 4/00
3



Recommended third-party SG1843 Datasheet






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