SG1842 Series

Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C

Catalog

Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C

Part	Package / Case	Package / Case	Package / Case	Frequency - Switching [Min]	Frequency - Switching [Max]	Fault Protection	Voltage - Start Up	Duty Cycle	Supplier Device Package	Mounting Type	Voltage - Supply (Vcc/Vdd) [Max]	Voltage - Supply (Vcc/Vdd) [Min]	Output Isolation	Operating Temperature [Max]	Operating Temperature [Min]	Topology	Control Features	Grade	Qualification
Microchip Technology SG1842Y	7.62 mm	0.3 in	8-CDIP	100 Hz	500 kHz	Current Limiting	16 V	95 %	8-CDIP	Through Hole	30 V	10 V	Isolated	125 °C	-55 °C	Flyback	Frequency Control
Microchip Technology SG1842Y-DESC	7.62 mm	0.3 in	8-CDIP	100 Hz	500 kHz	Current Limiting	16 V	95 %	8-CDIP	Through Hole	30 V	10 V	Isolated	125 °C	-55 °C	Flyback	Frequency Control
Microchip Technology SG1842Y-883B	7.62 mm	0.3 in	8-CDIP	100 Hz	500 kHz	Current Limiting	16 V	95 %	8-CDIP	Through Hole	30 V	10 V	Isolated	125 °C	-55 °C	Flyback	Frequency Control	Military	MIL-STD-883B

Catalog

Current Mode PWMs Isolated Switching Regulators Off-line, 16V UVLO-55°C to125°C

Key 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 (SG1842only)

• * Double-Pulse Suppression

• * High-Current Totem-Pole Output (1A Peak)

• * Internally Trimmed Band-gap Reference

• * 500kHz Operation Under-voltage Lockout: SG1842 - 16 volts, SG1843 - 8.4 volts

• * Low Shoot-Through Current <75mA Over Temperature

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 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. **Microchip Ordering Part** [**Standard Microcircuit Drawing (SMD)**](https://ww1.microchip.com/downloads/en/DeviceDoc/00003952.pdf) SG1842Y-DESC Cross Reference 5962-8670401PA SG1842Y-DESC Cross Reference 5962-8670401PX