LT1248CS#PBF

Overview

The LT1248CS#PBF is a power factor correction controller manufactured by Analog Devices Inc., designed for universal off-line power systems. It operates within an input voltage range of 90 to 270 VAC and supports output power up to 300 W. The device utilizes a fixed high-frequency PWM current averaging technique, eliminating the need for slope compensation. Key electrical parameters include a switching frequency of 100 kHz and a quiescent supply current of 250 µA. It is housed in a 16-pin SOIC-N package and functions reliably across a temperature range of 0°C to +100°C.

Feature Summary

• Provides active power factor correction for universal off-line power systems using fixed high-frequency PWM current averaging.
• Achieves significantly lower line current distortion compared to peak-current detection or zero-current switching methods.
• Operates without the need for slope compensation, enabling the use of smaller magnetic components.

Applications

• Universal off-line power supplies requiring active power factor correction
• Power factor correction controllers for AC-DC conversion systems
• Applications demanding low line current distortion with reduced magnetic component size

Procurement Notes

Verify the specific suffix #PBF to confirm lead-free compliance and RoHS status before procurement. Confirm the package type matches the design requirements, as variations exist between PDIP and SOIC packages within the LT1248 family. Check manufacturer documentation for any recent product change notices that may affect pinout or electrical characteristics. Ensure the operating temperature range aligns with the intended application environment.

Selection Notes

Select this component when designing power factor correction circuits for universal AC inputs where low harmonic distortion is critical. The fixed high-frequency PWM current averaging feature simplifies design by removing the need for slope compensation. Consider the 100 kHz switching frequency and 250 µA supply current when evaluating efficiency and thermal management requirements for the target power level.

Part Context

The LT1248 series from Analog Devices includes various power factor correction controllers tailored for different packaging and performance needs. The LT1248CS#PBF specifically denotes the commercial grade version in a 16-pin SOIC-N package. This part belongs to the broader PMIC category, focusing on improving power quality in AC-DC conversion applications through advanced control techniques.

Replacement Considerations

LT1248CN#PBF is a verified alternative offering identical functionality in a PDIP-16 package. LT1248CS#TRPBF provides the same SOIC-N package but in tape-and-reel format for automated assembly. Verify pin compatibility and thermal performance when substituting these variants.

FAQ

Does the LT1248CS#PBF require slope compensation?

No, the LT1248CS#PBF uses fixed high-frequency PWM current averaging, which eliminates the need for slope compensation.

What is the maximum output power supported by the LT1248CS#PBF?

The LT1248CS#PBF supports output power up to 300 W in typical power factor correction applications.