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SG1843L
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Product Detailed Parameters
- Description：CURRENT MODE PWMS, HIGH-RELIABIL
- Series：-
- Mfr：Microchip Technology
- Package：Tray
- 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：Surface Mount
- Package / Case：20-CLCC
- Supplier Device Package：20-CLCC (8.89x8.89)
- Grade：Military
- Qualification：MIL-STD-883
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Overview
The SG1843L is a current-mode PWM controller from Microchip Technology, designed for high-reliability isolated switching regulators. It supports flyback topology with one output and operates within a frequency range of 100 Hz to 500 kHz. The device features a maximum duty cycle of 100%, an output current capability of 200 mA or 1 A, and a switching rise/fall time of 50 ns. It functions in a CLCC-20 package with SMD/SMT mounting, operating between -55°C and +125°C. The part includes a totem pole output type and draws 11 mA of supply current.
Feature Summary
- Provides current-mode PWM control for off-line fixed-frequency switching power supplies
- Features robust isolation suitable for industrial and military applications
- Supports wide temperature operation for harsh environment reliability
Applications
- Military grade isolated switching regulators
- Industrial power supply designs
- Commercial flyback converter implementations
Procurement Notes
Verify the specific suffix (e.g., -883B) against official Microchip documentation to confirm radiation hardening or extended temperature specifications. Confirm RoHS compliance status directly with the manufacturer as requirements vary by production lot. Ensure the ordering suffix matches the required package and performance tier before finalizing procurement orders.
Selection Notes
Select the SG1843L when designing flyback converters requiring current-mode control and high reliability. Consider the 100% duty cycle capability for low input-to-output voltage ratio applications. Verify that the CLCC-20 package fits the PCB layout constraints and thermal management requirements of the target design.
Part Context
The SG1843L belongs to the SG1842/43 family of control ICs, which are engineered for implementing off-line fixed-frequency, current-mode switching power supplies. This family is characterized by its suitability for high-reliability applications, including those in military and industrial sectors, offering robust performance across wide temperature ranges.
Replacement Considerations
The SG1842 is a related component within the same family, sharing similar current-mode PWM control features and application scope. Verify pin compatibility and electrical parameter alignment before substituting.
