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STR-S5703 Datasheet (PDF) - Allegro MicroSystems

STR-S5703 Datasheet PDF - Allegro MicroSystems
Part No. STR-S5703
Download  STR-S5703 Click to view

File Size   162.29 Kbytes
Page   8 Pages
Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems
Description OFF-LINE SWITCHING REGULATOR WITH BIPOLAR SWITCHING TRANSISTOR

STR-S5703 Datasheet (PDF)

Go To PDF Page Download Datasheet
STR-S5703 Datasheet PDF - Allegro MicroSystems

Part No. STR-S5703
Download  STR-S5703 Click to view

File Size   162.29 Kbytes
Page   8 Pages
Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems
Description OFF-LINE SWITCHING REGULATOR WITH BIPOLAR SWITCHING TRANSISTOR

STR-S5703 Datasheet (HTML) - Allegro MicroSystems

STR-S5703 Datasheet HTML 1Page - Allegro MicroSystems STR-S5703 Datasheet HTML 2Page - Allegro MicroSystems STR-S5703 Datasheet HTML 3Page - Allegro MicroSystems STR-S5703 Datasheet HTML 4Page - Allegro MicroSystems STR-S5703 Datasheet HTML 5Page - Allegro MicroSystems STR-S5703 Datasheet HTML 6Page - Allegro MicroSystems STR-S5703 Datasheet HTML 7Page - Allegro MicroSystems STR-S5703 Datasheet HTML 8Page - Allegro MicroSystems

STR-S5703 Product details

The STR-S5703 is specifically designed to meet the requirement for increased integration and reliability in off-line quasi-resonant flyback converters with indirect feedback. The device incorporates the primary control and proportional drive circuit with a third-generation high-voltage bipolar switching transistor.

Crucial system parameters such as maximum ON time and OFF time are fixed during manufacture. Local control circuit decoupling and layout are optimized within each device.

Cycle-by-cycle current limiting, under-voltage lock-out with hyster esis, over-voltage protection, and thermal shutdown protect these devices during all normal and overload conditions. Over-voltage protection and thermal shutdown are latched after a short delay. A primary-side error amplifier with reference is included to facilitate regulation from an auxiliary or bias winding of the power transformer. A versatile triple-level inhibit circuit includes the OFF time synchronization required to establish quasi-resonant operation. The inhibit function has also been expanded to initiate operation in stand-by mode in which the power supply delivers a small fraction of the steady-state output power. The dual requirements of dielectric isolation and low transient thermal impedance and steady-state thermal resistance are satisfied in an over molded single-in-line power package.

Proven in substantial volumes, this device and its fixed-frequency counterparts represents a significant advance in off-line SMPS reliability growth and integration. Similar devices with increased ratings are the STR-S5707 and STR-S5708.



FEATURES

■ Quasi-Resonant Operation for Low EMI and High Efficiency

■ Output Power to 140 W

■ Low-Power Output Standby Mode

■ Indirect Feedback from Auxiliary Winding Reduces External Component Count

■ Pulse-by-Pulse Over-Current Protection

■ Latched Over-Voltage and Thermal Protection

■ Third-Generation Switching Transistor with Proportional Drive

■ Maximum ON Time and Off Time Set During Manufacture

■ Internal Under-Voltage Lockout with Hysteresis

■ Over-Molded SIP with Integral Isolated Heat Spreader



 



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