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LT1509 - Power Factor and PWM Controller

Download the LT1509 datasheet PDF. This datasheet also covers the LT1 variant, as both devices belong to the same power factor and pwm controller family and are provided as variant models within a single manufacturer datasheet.

General Description

The LT ® 1509 is a complete solution for universal off-line switching power supplies utilizing active power factor correction.

The PFC section is identical to the LT1248 PFC controller except the EN/SYNC pin is removed because PFC and PWM are synchronized internally.

Key Features

  • s s s s s s s s s s s s.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (LT1-509.pdf) that lists specifications for multiple related part numbers.

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Other Datasheets by Linear Technology (now Analog Devices)

Part Number Description
LT1500 Adaptive-Frequency Current Mode Switching Regulators
LT1501 Adaptive-Frequency Current Mode Switching Regulators
LT1505 Constant-Current/Voltage High Efficiency Battery Charger
LT1506 4.5A/ 500kHz Step-Down Switching Regulator
LT1507 500kHz Monolithic Buck Mode Switching Regulator

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
LT1509 Power Factor and PWM Controller FEATURES s s s s s s s s s s s s DESCRIPTION The LT ® 1509 is a complete solution for universal off-line switching power supplies utilizing active power factor correction. The PFC section is identical to the LT1248 PFC controller except the EN/SYNC pin is removed because PFC and PWM are synchronized internally. The current mode PWM section (the LT1508 is the voltage-mode counterpart) contains all the primary side functions to convert the PFC preregulated high voltage output to an isolated low voltage output. The PWM duty cycle is internally limited to 47% (maximum 50%) to prevent transformer saturation. PWM soft start begins when PFC output reaches the preset voltage.