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SG1843

Current Mode PWMs Isolated Switching Regulators Off-line, 8V UVLO - 55°C to125°C

Status: In Production

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 -
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output (1A Peak)
  • Internally Trimmed Band-gap Reference
  • 500kHz Operation Under-voltage Lockout: SG1843 - 8.4 volts
  • Low Shoot-Through Current <75mA Over Temperature
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Device Overview

Summary

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 band-gap 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°C to 125°C. The SG2842/43 is specified for the industrial range of -25°C to 85°C, and the SG3842/43 is designed for the commercial range of 0°C to 70°C.

Additional 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 -
    • Double-Pulse Suppression
    • High-Current Totem-Pole Output (1A Peak)
    • Internally Trimmed Band-gap Reference
    • 500kHz Operation Under-voltage Lockout: SG1843 - 8.4 volts
    • Low Shoot-Through Current <75mA Over Temperature
Parametrics
Name
Value
Regulator Type
HI Rel Switching Regulators
Configuration
Current Mode PWMs
Supported Topology
Power MOSFET Driver
Supported Output
1
Minimum Input Voltage (V)
30
Maximum Input Voltage (V)
30
Output Current (mA) Max
1000
Maximum Frequency (kHz)
500
Operating Temperature Range (°C)
-55 to 125
Vref (V)
5
Duty Cycle Max (%)
95
UVLO
Yes
Current Limit
Yes

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