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Part Number: SG1844
Description: The SG1844/45 family of control ICs provides all the necessary features to implement off-line fixed fr...
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SG1844
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DataSheet
General Description
SG1844 General 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 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 to 125.
The SG2844/45 is specified for the industrial range of -25 to 85, and the SG3844/45 is designed for the commercial range of 0 to 70.
SG1844 Maximum Ratings
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
Plastic (N, M, D, DM Packages) ......................................... 150
Storage Temperature Range ................................-65 to +150
Lead Temperature (Soldering, 10 Seconds) ........................ 300
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.
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
Plastic (N, M, D, DM Packages) ......................................... 150
Storage Temperature Range ................................-65 to +150
Lead Temperature (Soldering, 10 Seconds) ........................ 300
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.
SG1844 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
· UNDER-VOLTAGE LOCKOUT WITH 6V 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
· LOW START-UP CURRENT (<1mA)
· AUTOMATIC FEED FORWARD COMPENSATION
· TRIMMED OSCILLATOR DISCHARGE CURRENT
· PULSE-BY-PULSE CURRENT LIMITING
· ENHANCED LOAD RESPONSE CHARACTERISTICS
· UNDER-VOLTAGE LOCKOUT WITH 6V 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
SG1844 Connection Diagram
SG1844
PDF/DataSheet Download
- Datasheet: SG1844
- File Size: 221278 KB
- Manufacturer: MICROSEMI [Microsemi Corporation]
- Click here to Download
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