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SG1843L-DESC
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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-DESC is a high-reliability current-mode PWM controller designed for isolated switching regulators. Manufactured by Microchip Technology, it utilizes a flyback topology with one output and supports a switching frequency range of 100 Hz to 500 kHz. The device features a maximum duty cycle of 100 percent and an output current capability of 200 mA or 1 A. It operates within a temperature range of -55°C to +125°C and is housed in a CLCC-20 surface-mount package. Key electrical characteristics include a rise time of 50 ns, a fall time of 50 ns, and a quiescent supply current of 11 mA.
Feature Summary
- Optimized for off-line control applications with automatic feed forward compensation
- Low startup current consumption below 1 mA
- High-reliability design suitable for isolated switching regulator implementations
Applications
- High-reliability isolated switching regulators
- Off-line fixed frequency current-mode control schemes
- Space and satellite power systems requiring radiation tolerance
Procurement Notes
Verify the specific suffix designation with the manufacturer to confirm exact performance grades and qualification levels. Ensure that the ordering information aligns with the required reliability standards for the intended application environment. Confirm availability through authorized channels as this component may be subject to special order requirements.
Selection Notes
Select this controller for designs requiring high duty cycle operation up to 100 percent in flyback topologies. Consider the CLCC-20 package for applications needing robust thermal performance and high-reliability construction. Evaluate the 100 Hz to 500 kHz frequency range against transformer and switch requirements.
Part Context
The SG1843L-DESC belongs to the SG1842/SG1843 family of current-mode PWM controllers. This family provides essential features for implementing off-line fixed-frequency control solutions with minimal external components. The device is part of Microchip's portfolio of high-reliability power management integrated circuits.
Replacement Considerations
The SG1842/SG1843 datasheet indicates functional compatibility within the family. Verify pinout and parameter alignment before substituting with other variants in the SG184x series.
