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Product Detailed Parameters
- Description：IC REG CTRLR MULT TOPOLOGY 8SOIC
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Transistor Driver
- Function：Step-Up, Step-Up/Step-Down
- Output Configuration：Positive
- Topology：Boost, Flyback, Forward
- Number of Outputs：1
- Output Phases：1
- Voltage - Supply (Vcc/Vdd)：7.6V ~ 30V
- Frequency - Switching：Up to 500kHz
- Duty Cycle (Max)：48%
- Synchronous Rectifier：No
- Clock Sync：No
- Serial Interfaces：-
- Control Features：Frequency Control
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The TL2845BDRG4-8 is a current-mode PWM controller from the Texas Instruments TL284xB series, housed in an 8-SOIC package. It operates with a switching frequency up to 500 kHz and supports boost, flyback, and forward topologies. The device features a supply voltage range of 7.6 V to 30 V and a maximum duty cycle of 48%. It functions within a temperature range of -40°C to 85°C.
Feature Summary
- Current-mode control architecture for stable operation
- Integrated UVLO with specific threshold levels for offline applications
- Latching PWM comparator for per-cycle current limiting
- Internal precision reference voltage
Applications
- Offline power supplies
- DC-to-DC converters
- Boost converter designs
- Flyback converter implementations
- Forward converter circuits
Procurement Notes
Verify that the ordering suffix 'G4' confirms lead-free status and RoHS compliance as specified by the manufacturer. Confirm the package type matches the required PCB footprint. Ensure the operating temperature range meets the application's environmental requirements before finalizing procurement.
Selection Notes
Select this component when a fixed-frequency current-mode controller is required for isolated or non-isolated DC-DC conversion. The 48% maximum duty cycle limits suitability for high step-up ratios compared to other family members. Verify that the 500 kHz switching frequency aligns with the desired passive component size and efficiency targets.
Part Context
This part belongs to the TL284xB series, which offers improved startup characteristics over standard TL284x devices. The series includes variants with different UVLO thresholds and duty cycle ranges to suit various power supply architectures. The TL2845 variant specifically restricts the duty cycle to prevent double-pulsing in certain topologies.
Replacement Considerations
The TL2845BD-8 serves as a direct functional equivalent without the lead-free designation. Other family members like the TL2842BDR-8 offer different duty cycle limits. Verify pin compatibility and electrical specifications when substituting with similar controllers.
