LT1508CSW

Series: -
Mounting Type: Surface Mount
Mode: Average Current
Package / Case: 20-SOIC (0.295", 7.50mm Width)
Supplier Device Package: 20-SOIC
Packaging: Tube
Frequency - Switching: 100kHz
Manufacturer: Linear Technology
Operating Temperature: 0°C ~ 100°C
Current - Startup: -
Voltage - Supply: 27V


Features:

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 250mA Start-Up Supply Current
Line Switching Noise Filter
Low Quiescent Current: 13mA
Fast 1.5A Peak Current Gate Drivers
Separate Soft Start Control


Application

Universal Power Factor Corrected Power Supplies and Preregulators


Pinout




Specifications

Supply Voltage ........................................................ 27V
GTDR Current Continuous ...................................... 0.5A
GTDR Output Energy ................................................ 5mJ
IAC, RSET, PKLIM Input Current .............................. 20mA
VSENSE, OVP Input Voltage .................................... VMAX
ILIM, VC Input Voltage ................................................ 8V
ISENSE, MOUT Input Current ................................... ±5mA
Operating Junction Temperature Range
LT1508C ................................................ 0°C to 100°C
LT1508I ............................................ 40°C to 125°C
Thermal Resistance (Junction-to-Ambient)
N Package ................................................... 100°C/W
SW Package ................................................ 120°C/W


Description

The LT®1508 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.



Parameters: 

Technical/Catalog Information
LT1508CSW
Vendor
Linear Technology
Category
Integrated Circuits (ICs) 
  
Packaging
Tube
Package / Case
20-SOIC (7.5mm Width) 
Voltage - Supply
27V
Mode
Average Current
Frequency - Switching
100kHz
Current - Startup
-
Operating Temperature
0°C ~ 100°C
Drawing Number
161; 05-08-1620; SW; 16
  
Lead Free Status
Contains Lead
  
RoHS Status
RoHS Non-Compliant
 
  
Other Names
  
            LT1508CSW
      LT1508CSW