Monday, February 26, 2018

BD139 and BD140 Complementary Transistors

This pair is my favorite when driving small solenoids or motors. SOT-32 and 12 Watts on Heatsink. This means any small solenoid, relay or DC motor can be controlled with this. I would use it upto 24V DC and max of 1A for applications of full on and full off.

BD139 and  BD140 Complementary transistor

BD139  NPN Silicon Transistor

"The NPN types are the BD135 and BD139, and the complementary PNP types are the BD136 and BD140." -  - - BD139 - NPN, 80V and 1.5A, 40 beta min.

BD140 PNP Silicon Transistor

"They are designed for audio amplifiers and drivers utilizing complementary or quasi-complementary circuits." - - - BD140 - PNP, 80V and 1.5A, 40 beta min.

Linear Technology - Analog and Interface Solutions

They have unique Interface products that make blending the real world analog and the digital electronics that makes embedded computing possible.

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Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products  include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions.

SmartMesh WirelessHART RF Certified Starter Kit

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Linear Technology
1630 McCarthy Blvd. Milpitas, CA  95035-7417, USA.

Friday, February 23, 2018

SG3525 - PWM SMPS Regulator Chip

SG2525 - SG3525 - PWM SMPS Regulator Chip. A second generation ic switch mode controller optimized for high frequency.

SG3525 - Voltage Mode PWM

The SG3525A pulse width modulator control circuit offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. Half Bridge, Push-Pull.

SG2525 - SG3525 - PWM SMPS Regulator Chip

Specs
  • 8.0 V to 35 V Operation
  • 5.1 V +/- 1.0% Trimmed Reference
  • 100 Hz to 400 kHz Oscillator Range
  • Separate Oscillator Sync Pin
  • Adjustable Deadtime Control
  • Input Undervoltage Lockout
  • Latching PWM to Prevent Multiple Pulses
  • Pulse-by-Pulse Shutdown
  • Dual Source/Sink Outputs: +/- 400 mA Peak

100kHz Half Bridge Convertor - SG3525

This is a SMPS Circuit improved over the Application Note in the book SGS Motion Control Application Manual. This worked well. It helps you learn more about High Frequency Power Supply Design.

SG3525 usage in SMPS 500W - It was used in Parallel for Electroplating with a central Load sharing control between modules.

Circuits -

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