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Details, datasheet, quote on part number: SG1845Y/883B
 
 
Part numberSG1845Y/883B
CategoryPower Management => PWM Controllers => Current Mode PWMs
TitleCurrent Mode PWMs
DescriptionCurrent Mode Pwms, Package : Flatpack
CompanyMicrosemi Corporation
DatasheetDownload SG1845Y/883B datasheet
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Specifications, Features, Applications

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 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 to 125C. The SG2844/45 is specified for the industrial range to 85C, and the SG3844/45 is designed for the commercial range to 70C.

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 - 16 volts - 8.4 volts s LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE

O N Plastic SOIC Plastic SOIC Ceramic DIP Ceramic DIP J 14-pin
SG1845Y/DESC SG1845J/DESC Note: All surface-mount packages are available in Tape & Reel.

Supply Voltage (ICC < 30mA)............................................................... Self Limiting Supply Voltage (Low Impedance Source)........................................................ 30V Output Current (Peak)....................................................................................... 1A Output Current (Continuous)....................................................................... 350mA Output Energy (Capacitive Load)....................................................................... 5J Analog Inputs (VFB, ISENSE)................................................................ to +6.3V Error Amp Output Sink Current..................................................................... 10mA Operating Junction Temperature Hermetic (J, F, L Packages)................................................................... 150C Plastic (N, D, DM Packages)................................................................ 150C Storage Temperature Range.......................................................... to +150C Lead Temperature (Soldering, 10 Seconds).................................................. 300C

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.

M PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA N PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA D PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA Y PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA J PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA F PACKAGE: THERMAL RESISTANCE-JUNCTION TO CASE, JC THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA L PACKAGE: THERMAL RESISTANCE-JUNCTION TO CASE, JC THERMAL RESISTANCE-JUNCTION TO AMBIENT, 35C/W 120C/W

Junction Temperature Calculation: TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

1. N.C. 2. N.C. 3. COM. 4. N.C. 5. VFB 6. N.C. 7. ISENSE 8. RT/CT 9. N.C. 10. N.C.

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: SG2844/45 SG3844/45 Note 3. Range over which the device is functional.

Recommended Operating Conditions Min. Typ. Max.

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1844/SG1845 with SG2844/ SG2845 with 85C, SG3844/SG3845 with TA 70C, VCC = 15V (Note = 10k, and = 3.3nF. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

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

SG2844/45 SG3844/45 Units Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.

Initial Accuracy (Note 8) Voltage Stability Temperature Stability (Note 4) Amplitude Discharge Current 25C 12V VCC 25V TMIN TA TMAX VRT/CT (Peak to Peak) = 25C TMIN TA TMAX VCOMP = 2.5V AVOL PSRR 25C 12 VCC 25V VVFB = 2.7V, VCOMP = 1.1V VVFB = 2.3V, VCOMP = 5V VVFB 15K to gnd VVFB 15K to VREF




Related products with the same datasheet
SG1844J   SG1844J/883B   SG1844J/DESC   SG1844L   SG1844L/883B   SG1844L/DESC  
SG1844Y   SG1844Y/883B   SG1844Y/DESC   SG1845F/DESC   SG1845J   SG1845J/883B  


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