Wednesday, December 13, 2017

TL494 - SMPS PWM Classic Controller

The TL494 incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.

TL494 - SMPS PWM Classic Controller
  • Complete PWM Power-Control Circuitry
  • Uncommitted Outputs for 200-mA Sink or Source Current
  • Output Control Selects Single-Ended or Push-Pull Operation
  • Internal Circuitry Prohibits Double Pulse at Either Output
  • Variable Dead Time Provides Control Over Total Range
  • Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance
  • Circuit Architecture Allows Easy Synchronization
PWM Control Circuit - TL494

The TL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.

Tuesday, December 05, 2017

Peregrine Semiconductor - RF CMOS

A fabless provider of high-performance radio frequency integrated circuits, or RFICs. Thier innovation called UltraCMOS makes the integration of multiple RF, mixed-signal, and digital functions on a single chip.

Peregrine Semiconductor - RF CMOS

They provide solutions for WCDMA and GSM digital cellular, broadband, DTV, DVR, and radiation hard space and defense programs.

The products are used in applications like ...

"From GSM cellular handsets, CDMA digital cellular and RIM devices, to CATV/DTV/DVR and other high-growth wireless broadband applications .."

Peregrine PE97022 high-performance integer-N PLL

Peregrine's PE97022 is a high-performance integer-N PLL capable of frequency synthesis up to 3.5 GHz. Features a 10/11 dual modulus prescaler, counters and a phase comparator.

"The TX/RX portion of the RF signal chain lies between the tuning/switching portion and any sort of power conversion components. This portion of the signal chain has potential for size reduction and increased efficiency...."

Peregrine Semiconductor Corporation
9380 Carroll Park Drive San Diego, CA, 92121 USA

Monday, December 04, 2017

CD4093BC Quad NAND Schmitt Trigger

The CD4093B consists of four Schmitt-trigger circuits. Each circuit functions as a 2-input NAND gate with Schmitt-trigger action on both inputs. The gate switches at different points for positive and negative-going signals.

CD4093 - Quad 2-Input NAND Schmitt Trigger

The difference be-tween the positive (VTa) and the negative voltage (VTb)isdefined as hysteresis voltage (VH). All outputs have equal source and sink currents and con-form to standard B-series output drive.

CD4093BC Quad NAND Schmitt Trigger

CD4093 is a very useful chip, as it has a Schmitt-trigger and it is a nand, cmos, low power. It can be even made to function like an amp in some configurations. It was used in debouncing circuits, oscillator circuits and input signal conditioning of digital circuits.

DMM range and AC-DC mode Logic

If you had a train of square pulses from a magnetic sensor or proximity sensor. You could use this as a monostable or singleshot to reject noise and get a clean square wave from a messy input.