SG1845Y

CURRENT MODE PWM CONTROLLER

DESCRIPTION TheSG1844/45familyofcontrolICsprovidesallthenecessaryfeaturestoimplementoff-linefixedfrequency,current-modeswitchingpowersupplieswithaminimumnumberofexternalcomponents.Current-modearchitecturedemonstratesimprovedlineregulation,improvedloadregulation,

SG1845Y

Space-grade Power Management;

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 ? HYSTERESIS (SG1844 only) ? DOUBLE PULSE SUPPRESSION ? HIGH-CURRENT TOTEM-POLE OUTPUT ? INTERNALLY TRIMMED BANDGAP REFERENCE ? 500kHz OPERATION ? UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts ? LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE 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-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 SG1844/45 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. 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.

SG1845Y

CURRENT MODE PWM CONTROLLER

SG1845Y

Package：8-CDIP（0.300"，7.62mm）；包裝：管件 功能：升壓/降壓 類別：集成電路（IC） PMIC - 穩(wěn)壓器 - DC DC 開關(guān)式控制器 描述：IC REG CTRLR FLYBACK 8DIP

SG1845Y

Package：8-CDIP（0.300"，7.62mm）；包裝：管件 功能：升壓/降壓 類別：集成電路（IC） DC-DC 開關(guān)控制器 描述：IC REG CTRLR FLYBACK 8DIP

SG1845Y/883B

CURRENT MODE PWM CONTROLLER

DESCRIPTION TheSG1844/45familyofcontrolICsprovidesallthenecessaryfeaturestoimplementoff-linefixedfrequency,current-modeswitchingpowersupplieswithaminimumnumberofexternalcomponents.Current-modearchitecturedemonstratesimprovedlineregulation,improvedloadregulation,

SG1845Y/DESC

CURRENT MODE PWM CONTROLLER

DESCRIPTION TheSG1844/45familyofcontrolICsprovidesallthenecessaryfeaturestoimplementoff-linefixedfrequency,current-modeswitchingpowersupplieswithaminimumnumberofexternalcomponents.Current-modearchitecturedemonstratesimprovedlineregulation,improvedloadregulation,

SG1845Y-883B

Space-grade Power Management;

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 ? HYSTERESIS (SG1844 only) ? DOUBLE PULSE SUPPRESSION ? HIGH-CURRENT TOTEM-POLE OUTPUT ? INTERNALLY TRIMMED BANDGAP REFERENCE ? 500kHz OPERATION ? UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts ? LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE 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-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 SG1844/45 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. 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.

SG1845Y-DESC

Space-grade Power Management;

Cross reference to 5962-8670404PA, 5962-8670404, 8670404Features: ? 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 ? HYSTERESIS (SG1844 only) ? DOUBLE PULSE SUPPRESSION ? HIGH-CURRENT TOTEM-POLE OUTPUT ? INTERNALLY TRIMMED BANDGAP REFERENCE ? 500kHz OPERATION ? UNDERVOLTAGE LOCKOUT SG1844 - 16 volts SG1845 - 8.4 volts ? LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE 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-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 SG1844/45 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. 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.

SG1845YSLASH883B

CURRENT MODE PWM CONTROLLER

DESCRIPTION TheSG1844/45familyofcontrolICsprovidesallthenecessaryfeaturestoimplementoff-linefixedfrequency,current-modeswitchingpowersupplieswithaminimumnumberofexternalcomponents.Current-modearchitecturedemonstratesimprovedlineregulation,improvedloadregulation,