SG3525:Voltage Mode PWM

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.

Key Features

  • DUAL SOURCE/SINK OUTPUT DRIVERS
  • LATCHING PWM TO PREVENT MULTIPLE PULSES
  • PULSE-BY-PULSE SHUTDOWN
  • INTERNAL SOFT-START
  • 8 TO 35 V OPERATION
  • 100 Hz TO 500 KHz OSCILLATOR RANGE
  • 5.1 V REFERENCE TRIMMED TO ± 1 %
  • ADJUSTABLE DEADTIME CONTROL
  • INPUT UNDERVOLTAGE LOCKOUT WITH HYSTERESIS
  • SEPARATE OSCILLATOR SYNC TERMINAL
Product Specifications
DescriptionVersionSize
DS0901: REGULATING PULSE WIDTH MODULATORS4.0934 KB
Application Notes
DescriptionVersionSize
AN250: A second-generation IC switch mode controller optimized for high frequency power MOS drive1.2835 KB
Presentations
DescriptionVersionSize
Primary side regulation controllers portfolio1 MB
Brochures
DescriptionVersionSize
Brochure Power management guide05.20164 MB
Sample & Buy
Part NumberPackagePacking TypeUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
SG3525ANPDIP 16Tube--NECEAR99MALAYSIA
SG3525AP013TRSO-16Tape And Reel--NECEAR99CHINA
SG3525APSO-16Tube--NECEAR99CHINA
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
SG3525ANPDIP 16IndustrialEcopack2 (**)md_17-wspc-pdip-wspc-16-wspc-.3-wspc-cu-wspc-.25-wspc-std_9m17-wspc-l752ua6_vers2_signed.pdf
md_17-wspc-pdip-wspc-16-wspc-.3-wspc-cu-wspc-.25-wspc-std_9m17-wspc-l752ua6_vers2.xml
SG3525AP013TRSO-16IndustrialEcopack2 (**)md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_kkq7-wspc-l752uaw_vers2_sdm_signed.pdf
md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_kkq7-wspc-l752uaw_vers2.xml
SG3525APSO-16IndustrialEcopack2 (**)md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_kkq7-wspc-l752uaw_vers2_sdm_signed.pdf
md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_kkq7-wspc-l752uaw_vers2.xml
REGULATING PULSE WIDTH MODULATORS SG2525
circuit_diagram_4286_thumbnail.png SG2525
A second-generation IC switch mode controller optimized for high frequency power MOS drive SG3525
48 V - 130 W high efficiency converter with PFC for LED street lighting applications - European version L6599AT
Very low drop voltage regulators with inhibit KFXX
md_17-wspc-pdip-wspc-16-wspc-.3-wspc-cu-wspc-.25-wspc-std_9m17-wspc-l752ua6_vers2_signed.pdf SG3525
md_17-wspc-pdip-wspc-16-wspc-.3-wspc-cu-wspc-.25-wspc-std_9m17-wspc-l752ua6_vers2.xml SG3525
md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_kkq7-wspc-l752uaw_vers2_sdm_signed.pdf SG3525
md_q7-wspc-so-wspc-16-wspc-.15-wspc-to-wspc-jedec-wspc-ms-012_kkq7-wspc-l752uaw_vers2.xml SG3525