STR3A100 Series: PWM Off-Line Switching Regulator ICs

STR3A100 series are power ICs for switching power supplies, incorporating a power MOSFET and a current mode PWM controller IC in one package.

Including a startup circuit and a standby function in the controller, the product achieves low power consumption, low standby power, and high cost-effectiveness in power supply systems, while reducing external components.

Applications

Switching power supplies for electronic devices such as:

  • Stand-by power supply for LCD/PDP television, desktop PC, multi-function printer, audio equipment, and so forth
  • Small switched-mode power supply (SMPS) for printer, BD/DVD player, set-top box, and so forth
  • Auxiliary power supply for air conditioner, refrigerator, washer, dishwasher, and so forth
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  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Current mode PWM control
  • Built-in Random Switching function: reduces EMI noise, simplifies EMI filters, and cuts cost by external part reduction
  • Built-in Slope Compensation function: avoids subharmonic oscillation
  • Built-in Leading Edge Blanking (LEB) function
  • Auto Standby function:
    • Input power, PIN <10 mW at no load with low power consumption shunt regulator
    • Normal load operation: PWM switching
    • Light load operation: Standby mode (Burst oscillation)
  • Soft Start function: reduces stress on internal power MOSFET and secondary output rectifier diode at startup
  • Protection Functions:
    • Overcurrent Protection function (OCP); pulse-by-pulse, built-in compensation circuit to minimize OCP point variation on AC input voltage
    • Overload Protection function (OLP); auto restart, built-in timer, reduces heat during overload condition, and no external components required
    • Overvoltage Protection function (OVP); latched shutdown, or auto restart for D and HD types
    • Thermal Shutdown function (TSD); latched shutdown, or auto restart for D and HD types
Package

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Product Image Functional Block Diagram Typical Application

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
STR3A151 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A151D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A152 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A152D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A153 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A153D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A154 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A154D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A155 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A155D 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A161HD 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A162HD 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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STR3A163HD 8-lead DIP -20°C to 85°C Yes View Data New Contact your
local sales rep
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Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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