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SG1843
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Product Detailed Parameters
- Description：CURRENT MODE PWMS, HIGH-RELIABIL
- Series：-
- Mfr：Microchip Technology
- Package：Tube
- Output Type：Transistor Driver
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：30V
- Frequency - Switching：100Hz ~ 500kHz
- Duty Cycle (Max)：95%
- Synchronous Rectifier：No
- Clock Sync：No
- Serial Interfaces：-
- Control Features：-
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：-
- Package / Case：-
- Supplier Device Package：-
- Grade：Military
- Qualification：MIL-STD-883
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Overview
The SG1843 is a high-reliability current-mode PWM controller designed for isolated switching regulators. It supports flyback topologies with a single output and operates within a frequency range of 100 Hz to 500 kHz. The device features a maximum duty cycle of 100% and provides output currents of 200 mA or 1 A. It functions in temperatures from -55°C to +125°C, utilizing through-hole CDIP-8 or SMD CLCC-20 packages. Key electrical parameters include a 50 ns rise/fall time, 11 mA operating supply current, and isolated insulation.
Feature Summary
- Optimized for off-line control applications
- Low startup current consumption under 1mA
- Automatic feed forward compensation
Applications
- High-reliability isolated switching regulators
- Off-line fixed frequency power supplies
- Current-mode PWM control circuits
Procurement Notes
Verify the specific suffix (e.g., Y, L-883B) to confirm package type and reliability grade before ordering. Confirm availability as these are often factory special order items. Request official datasheets to validate pinout and thermal specifications against your design requirements. Ensure compliance with RoHS details provided by the manufacturer.
Selection Notes
Select based on required isolation and temperature range. Choose through-hole variants for standard industrial mounting or ceramic packages for high-reliability aerospace applications. Verify that the current mode control aligns with your transformer design. Ensure the 100% duty cycle capability meets your voltage regulation needs.
Part Context
Part of the SG1842/SG1843 family of current-mode PWM controllers. Manufactured by Microchip Technology, formerly Microsemi. Designed for robust performance in demanding environments requiring high reliability and precise current-mode regulation for isolated power conversion systems.
Replacement Considerations
Check for direct equivalents like SG1842 for dual-output configurations. Verify compatibility with SG2843 series if different packaging is required. Ensure substitute parts maintain the same current-mode control architecture and isolation ratings.
FAQ
What topology does the SG1843 support?
It supports flyback topologies.
Is the SG1843 an isolated controller?
Yes, it is designed for isolated switching regulators.
