SG3844J中文资料
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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.
元器件交易网
L I N D O C # : 1844
SG1844/SG1845 Series
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
PA C K A G E O R D E R I N F O R M AT I O N Plastic SOIC Plastic SOIC Ceramic DIP Ceramic DIP DM 8-pin D 14-pin Y 8-pin J 14-pin
SG3844DM SG3845DM SG2844DM SG2845DM — — — — — SG3844D SG3845D SG2844D SG2845D — — — — — SG3844Y SG3845Y SG2844Y SG2845Y SG1844Y SG1845Y SG3844J SG3845J SG2844J SG2845J SG1844J SG1845J
P
R O D U C T I O N
D
A T A
S
H E E T
A B S O L U T E M A X I M U M R AT I N G S
(Notes 1 & 2)
PACKAGE PIN OUTS
COM VFB ISENSE RT/CT
1 2 3 4 8 7 6 5
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 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
F 10-pin
— — — — — — — —
Cer. Flatpack
L பைடு நூலகம்0-pin
— — — —
Ceramic LCC
SG3844M SG3845M SG2844M SG2845M — — — — —
SG1844L SG1845L SG1844L/883B SG1845L/883B
SG1844Y/883B SG1844J/883B SG1845Y/883B SG1845J/883B SG1844Y/DESC SG1844J/DESC
SG1844F/DESC SG1844L/DESC SG1845F/DESC SG1845L/DESC
— — SG1845Y/DESC SG1845J/DESC Note: All surface-mount packages are available in Tape & Reel.
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
D
A T A
S
H E E T
DESCRIPTION The SG1844/45 family of control ICs 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-bypulse 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 SG1844/45 has undervoltage 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. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2844/45 is specified for the industrial range of -25°C to 85°C, and the SG3844/45 is designed for the commercial range of 0°C to 70°C.
VREF VCC OUT UT GND
M & Y PACKAGE (Top View)
COM VFB ISENSE RT/CT
1 2 3 4 8 7 6 5
VREF VCC OUT UT GND
DM PACKAGE (Top View)
COM N.C. VFB N.C. ISENSE N.C. RT/CT
AC INPUT
IST VCC
SG3844
TA (°C)
0 to 70 -25 to 85 -55 to 125 MIL-STD/883 DESC
M
Plastic DIP 8-pin
N
Plastic DIP 14-pin
SG3844N SG3845N SG2844N SG2845N — — — — —
K E Y F E AT U R E S
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 (SG1844 only) s DOUBLE PULSE SUPPRESSION s HIGH-CURRENT TOTEM-POLE OUTPUT s INTERNALLY TRIMMED BANDGAP REFERENCE s 500kHz OPERATION s UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts s LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE
元器件交易网
L I N D O C # : 1844
SG1844/SG1845 Series
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
PA C K A G E O R D E R I N F O R M AT I O N Plastic SOIC Plastic SOIC Ceramic DIP Ceramic DIP DM 8-pin D 14-pin Y 8-pin J 14-pin
SG3844DM SG3845DM SG2844DM SG2845DM — — — — — SG3844D SG3845D SG2844D SG2845D — — — — — SG3844Y SG3845Y SG2844Y SG2845Y SG1844Y SG1845Y SG3844J SG3845J SG2844J SG2845J SG1844J SG1845J
P
R O D U C T I O N
D
A T A
S
H E E T
A B S O L U T E M A X I M U M R AT I N G S
(Notes 1 & 2)
PACKAGE PIN OUTS
COM VFB ISENSE RT/CT
1 2 3 4 8 7 6 5
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 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
F 10-pin
— — — — — — — —
Cer. Flatpack
L பைடு நூலகம்0-pin
— — — —
Ceramic LCC
SG3844M SG3845M SG2844M SG2845M — — — — —
SG1844L SG1845L SG1844L/883B SG1845L/883B
SG1844Y/883B SG1844J/883B SG1845Y/883B SG1845J/883B SG1844Y/DESC SG1844J/DESC
SG1844F/DESC SG1844L/DESC SG1845F/DESC SG1845L/DESC
— — SG1845Y/DESC SG1845J/DESC Note: All surface-mount packages are available in Tape & Reel.
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
D
A T A
S
H E E T
DESCRIPTION The SG1844/45 family of control ICs 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-bypulse 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 SG1844/45 has undervoltage 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. Both operate up to a maximum duty cycle range of zero to <50% due to an internal toggle flip-flop which blanks the output off every other clock cycle. The SG1844/45 is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2844/45 is specified for the industrial range of -25°C to 85°C, and the SG3844/45 is designed for the commercial range of 0°C to 70°C.
VREF VCC OUT UT GND
M & Y PACKAGE (Top View)
COM VFB ISENSE RT/CT
1 2 3 4 8 7 6 5
VREF VCC OUT UT GND
DM PACKAGE (Top View)
COM N.C. VFB N.C. ISENSE N.C. RT/CT
AC INPUT
IST VCC
SG3844
TA (°C)
0 to 70 -25 to 85 -55 to 125 MIL-STD/883 DESC
M
Plastic DIP 8-pin
N
Plastic DIP 14-pin
SG3844N SG3845N SG2844N SG2845N — — — — —
K E Y F E AT U R E S
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 (SG1844 only) s DOUBLE PULSE SUPPRESSION s HIGH-CURRENT TOTEM-POLE OUTPUT s INTERNALLY TRIMMED BANDGAP REFERENCE s 500kHz OPERATION s UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts s LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE
