Wednesday, June 19, 2019

Lattice Semiconductor - FPGA CPLD

A leading manufacturer of high-performance programmable logic devices PLDs, field-programmable gate arrays FPGAs, programmable mixed-signal and interconnect products, related software and intellectual property IP.

Products include FPGAs, CPLDs, Power Management and Clock Management Devices.

Lattice Semiconductor - FPGA CPLD
The ispMACH 4000ZE CPLD family is ideal for ultra low-power, high-volume portable applications.
Standby current as low as 10µA (typical) 1.8V core; Operational down to 1.6V VCC. Easy System Integration, Flexible multi-volt I/O.

5V tolerant I/O for LVCMOS 3.3, LVTTL, and PCI interfaces. JTAG In-System Programmable (ISPTM), On-chip user oscillator and timer,

ispMACH 4000ZE Evaluation Board

ispMACH 4000ZE Evaluation Board

ispMACH_4000ZE ispMACH 4000ZE Family

Lattice Semiconductor
5555 NE Moore Ct, Hillsboro, OR 97124, USA

Tuesday, June 11, 2019

BC557 PNP Transistor General Purpose

BC556, BC557 and BC558 PNP Amplifier Transistors are not only popular today but very ancient, it is used as a General Purpose device and a popular LED control in small products.

BC557 PNP Transistor - Amplifier

This Silicon device along with some others replaced Germanium Devices in Preamplifiers and Portable Transistor Radios  and Portable Tape Recorders. A Complement is the BC547 NPN General Purpose Transistor. Now for Specs 45V, 100mA, 200 beta approx.

BC557 PNP Transistor General Purpose

I will explain in a way most can comprehend. Do not use this for circuits working around 30-40 Volts. Use it for circuits upto 24 volts on the safer side. (45 V max rating)

Do not subject the base emmiter (diode path ) to any kind of reverse bias. That includes kickback from coils of relays or solenoids. This will damage the device, protect with a diode if needed.

Do not work it hot, it is not a metal device, use it for small signal. Reed Relay driving is possible, Single LED drive is also ok. Microphone Amplifiers, Bass, Treble and Presence controls. LED Flashers, Graphic Equalizers are things you could make with this, using Filter Circuits.

Continuous current rating is 100mA, this is fine if transistor is saturated or fully on, when voltage across device is very less and current is 100mA. Power Dissipation is tolerable. If Transistor is just partially ON or Switching fast, The Power Dissipation can peak and eventually damage the device. The device can manage to survive say 500 mW or a little more, but remember that the battery is draining fast.

A 200 Beta is pretty good, it depends on temperature, voltage and other factors. 100uA base drive can can turn on a LED at 20mA in the collector path. You can drive a LED from Opamp or Logic IC using this device, just add a 22k in series to the base.

Design products that are safe, last long and use very little power. That is pretty Green.

- delabs Notes from 1988 offline notes to 1999 online notes. enhanced 2019

Monday, June 10, 2019

High-Voltage High-Power IGBT - Hitachi

IGBT module from  Hitachi. The new IGBT module makes high energy efficiency and silent operation of inverters possible. It has High thermal fatigue durability. It is a High speed and low loss IGBT module.

High-Voltage High-Power IGBT

Low noise due to soft and fast recovery diode. The driving power is less as the MOS gate input capacitance is very low. The modules are very reliable and durable. The heatsink has a Isolation between terminals and base.

High-Voltage High-Power IGBT

From 1700V to 6500V,  High Power Density, Low Inductance, Scalable, Easy Paralleling, Standard and High Isolation Package.

The Hitachi Power Semiconductor Devices mark a new era of Power electronics by High-Power IGBT modules, High-Voltage ICs and Power diodes.

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