LT1508

Obsolete

LT1508

Power Factor and PWM Controller (Voltage Mode)

Obsolete

Alternative Part

LT1509

Power Factor and PWM Controller

LT1509

PRODUCTION

Power Factor and PWM Controller

Obsolete

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Features

OBSOLETE: For Information Purposes Only. Contact Analog Devices for Potential Replacement.
PFC and PWM Single Chip Solution
Synchronized Operation up to 300kHz
99% Power Factor over 20:1 Load Current Range
Voltage Mode PWM
Instantaneous Overvoltage Protection
Dedicated Overvoltage Protection (OVP Pin)
Minimal Line Current Dead Zone
Typical 250µA Start-Up Supply Current
Line Switching Noise Filter
Low Quiescent Current: 13mA
Fast 1.5A Peak Current Gate Drivers
Separate Soft-Start Control

Additional Details

OBSOLETE: For Information Purposes Only. Contact Analog Devices for Potential Replacement.

The LT1508 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 voltage mode PWM section (LT1509 is the current 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 the PFC output reaches the preset voltage. In the event of brief line loss, PWM will be shut off when the PFC output voltage drops below 73% of the preset value.

Applications

Universal Power Factor Corrected Power Supplies and Preregulators

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Technical Documents 4

LT1508: Power Factor and PWM Controller (Voltage Mode) Data Sheet 08/22/2007

R389 Reliability Data 03/21/2018

AN66 - Linear Technology Magazine Circuit Collection, Volume II 08/20/2007

DN143 - Single IC, Power Factor Corrected, Off-Line Supply 08/21/2007

Alternative Parts 1

Parts	Product Life Cycle	Description
LT1509	PRODUCTION	Power Factor and PWM Controller

LTspice 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.