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SG1845Y
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Product Detailed Parameters
- Description：IC REG CTRLR FLYBACK 8DIP
- Series：-
- Mfr：Microchip Technology
- Package：Bulk
- Output Type：Transistor Driver
- Function：Step-Up/Step-Down
- Output Configuration：Positive, Isolation Capable
- Topology：Flyback
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：7.6V ~ 30V
- Frequency - Switching：1Hz ~ 500kHz
- Duty Cycle (Max)：48%
- Synchronous Rectifier：Yes
- Clock Sync：No
- Serial Interfaces：-
- Control Features：-
- Operating Temperature：-55°C ~ 125°C (TA)
- Mounting Type：Through Hole
- Package / Case：8-CDIP (0.300", 7.62mm)
- Supplier Device Package：8-CERDIP
- Grade：-
- Qualification：-
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Overview
The SG1845Y is a high-reliability, current-mode PWM controller designed for isolated switching regulators. It utilizes a flyback topology with a single output channel and supports switching frequencies from 100 Hz to 500 kHz. The device features a maximum duty cycle of 50% and an output drive capability of 1 A. It operates within a temperature range of -55°C to +125°C and is housed in a CDIP-8 package.
Feature Summary
- Current-mode architecture provides improved line and load regulation with inherent pulse-by-pulse current limiting.
- High-reliability construction suitable for demanding industrial and military applications.
- Integrated bandgap reference trimmed for precision over the operating temperature range.
Applications
- Off-line fixed frequency switching power supplies
- High-reliability isolated DC-DC converters
- Military and aerospace electronic systems
Procurement Notes
Verify specific ordering suffixes such as -883B or -DESC to confirm exact qualification levels and packaging configurations. Contact the manufacturer directly for factory special order requirements, lead times, and current availability status, as standard stock levels may vary significantly for this component series.
Selection Notes
Select this component when designing flyback converters requiring robust current-mode control and wide thermal operation. Ensure the external oscillator components support the desired frequency within the 100 Hz to 500 kHz range. Verify that the required output current does not exceed the 1 A drive limit and that the system voltage aligns with the controller's input specifications.
Part Context
This part belongs to the SG1844/SG1845 family of current-mode PWM controllers. These devices are engineered to implement off-line switching power supplies with minimal external components. The family shares core architectural features, including current-limiting protection and precise reference voltages, tailored for high-performance isolated regulator designs.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation. Evaluate cross-reference options based on pin compatibility and electrical parameters only after verifying official manufacturer substitution lists.
