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Part Number: SG1843
Description: The SG1842/43 family of control IC's provides all the necessary features to implement off-line fixed f...
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SG1843
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DataSheet
General Description
SG1843 General 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 to 125. The SG2842/43 is specified for the industrial range of -25 to 85, and the SG3842/43 is designed for the commercial range of 0 to 70.
SG1843 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
Power Dissipation at TA = 25 (DIL-8) .......................................1W
Operating Junction Temperature
Hermetic (J, Y, F, L Packages) ................................................ 150
Plastic (N, M, D, DM Packages) .............................................. 150
Storage Temperature Range .................................. -65to +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
Power Dissipation at TA = 25 (DIL-8) .......................................1W
Operating Junction Temperature
Hermetic (J, Y, F, L Packages) ................................................ 150
Plastic (N, M, D, DM Packages) .............................................. 150
Storage Temperature Range .................................. -65to +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.
SG1843 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 (SG1842 only)
· DOUBLE-PULSE SUPPRESSION
· HIGH-CURRENT TOTEM-POLE OUTPUT\ (1AMP PEAK)
· INTERNALLY TRIMMED BANDGAP REFERENCE
· 500KHZ OPERATION
· UNDERVOLTAGE LOCKOUT
SG1842 - 16 volts
SG1843 - 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 (SG1842 only)
· DOUBLE-PULSE SUPPRESSION
· HIGH-CURRENT TOTEM-POLE OUTPUT\ (1AMP PEAK)
· INTERNALLY TRIMMED BANDGAP REFERENCE
· 500KHZ OPERATION
· UNDERVOLTAGE LOCKOUT
SG1842 - 16 volts
SG1843 - 8.4 volts
· LOW SHOOT-THROUGH CURRENT <75mA OVER TEMPERATURE
SG1843 Connection Diagram
SG1843 series
PDF/DataSheet Download
- Datasheet: SG1843 series
- File Size: 263332 KB
- Manufacturer: Microsemi
- Click here to Download
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