ST Life.augmented

SG3525

Voltage Mode PWM
  • active Active

The SG3525A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip + 5.1 V reference is trimmed to ±1 % and the input common-mode range of the error amplifier includes the reference voltage eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between the CT and the discharge terminals provide a wide range of dead time ad- justment.These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuity and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown,as well as soft-start recycle with longer shutdown commands. These functions are also controlled by an undervoltage lockout which keeps the outputs off and the soft-start capacitor discharged for sub-normal input voltages. This lockout circuitry includes approximately 500 mV of hysteresis for jitter-free operation. Another feature of these PWM circuits is a latch following the comparator. Once a PWM pulses has been terminated for any reason,the outputs will remain off for the duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200 mA. The SG3525A output stage features NOR logic, giving a LOW output for an OFF state.

pdf Please read
Errata Sheet
pdf Download
Datasheet

Key Features

  • 8 TO 35 V OPERATION
  • 5.1 V REFERENCE TRIMMED TO ± 1 %
  • 100 Hz TO 500 KHz OSCILLATOR RANGE
  • SEPARATE OSCILLATOR SYNC TERMINAL
  • ADJUSTABLE DEADTIME CONTROL
  • INTERNAL SOFT-START
  • PULSE-BY-PULSE SHUTDOWN
  • INPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
  • LATCHING PWM TO PREVENT MULTIPLE PULSES
  • DUAL SOURCE/SINK OUTPUT DRIVERS

Circuit Diagram

Design Resources

Top

Technical Documentation

Product Specifications

Description Version Size
pdf
DS0901: REGULATING PULSE WIDTH MODULATORS
4.0 936 KB

Application Notes

Description Version Size
pdf
AN250: A second-generation IC switch mode controller optimized for high frequency power MOS drive
1.2 836 KB

Sample & Buy

Top
Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SG3525ANActivePDIP 16Tube_-.532Distributor reported inventory date: 2015-01-30
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA20501000
AVNETOrder NowAMERICA37940
Newark Element14Order NowAMERICA7060
ANGLIA LiveOrder NowEUROPE10091
ARROWOrder NowEUROPE30490
Farnell Element14Order NowEUROPE5321
RUTRONIKOrder NowEUROPE747525
DIGIKEYOrder NowWORLDWIDE24541
MOUSEROrder NowWORLDWIDE21981
Ecopack2 (**)PDF
XML
SG3525APActiveSO-16Tube_-.532Distributor reported inventory date: 2015-01-30
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA6711000
AVNETOrder NowAMERICA15480
ANGLIA LiveOrder NowEUROPE50501
ARROWOrder NowEUROPE29660
Farnell Element14Order NowEUROPE461
RS COMPONENTSOrder NowEUROPE9082
DIGIKEYOrder NowWORLDWIDE3071
MOUSEROrder NowWORLDWIDE13961
Ecopack2 (**)PDF
XML
SG3525AP013TRActiveSO-16Tape And Reel_-.532Distributor reported inventory date: 2015-01-30
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA112500
AVNETOrder NowAMERICA25000
RUTRONIKOrder NowEUROPE25002500
DIGIKEYOrder NowWORLDWIDE54571
MOUSEROrder NowWORLDWIDE34171
Ecopack2 (**)PDF
XML

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Feedback Form
Customer Feedback