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SG3525

Voltage Mode PWM
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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.

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Errata Sheet
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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

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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

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Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
SG3525ANActivePDIP 16Tube_-.532Distributor reported inventory date: 2015-08-31
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA9411000
AVNETOrder NowAMERICA58520
Newark Element14Order NowAMERICA8670
ANGLIA LiveOrder NowEUROPE21681
ARROWOrder NowEUROPE20990
Farnell Element14Order NowEUROPE20421
RS COMPONENTSOrder NowEUROPE93010
RUTRONIKOrder NowEUROPE170025
DIGIKEYOrder NowWORLDWIDE13211
FUTUREOrder NowWORLDWIDE280331
MOUSEROrder NowWORLDWIDE14661
Ecopack2 (**)PDF
XML
SG3525APActiveSO-16Tube_-.532Distributor reported inventory date: 2015-08-31
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA42751000
AVNETOrder NowAMERICA22180
ANGLIA LiveOrder NowEUROPE49501
ARROWOrder NowEUROPE123160
RS COMPONENTSOrder NowEUROPE4082
RUTRONIKOrder NowEUROPE75050
DIGIKEYOrder NowWORLDWIDE11061
FUTUREOrder NowWORLDWIDE10141
MOUSEROrder NowWORLDWIDE12661
Ecopack2 (**)PDF
XML
SG3525AP013TRActiveSO-16Tape And Reel_-.532Distributor reported inventory date: 2015-08-31
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA84922500
AVNETOrder NowAMERICA25000
DIGIKEYOrder NowWORLDWIDE62851
FUTUREOrder NowWORLDWIDE125002500
MOUSEROrder NowWORLDWIDE21591
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.
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