This document is a preliminary specification for the TDA4858, an economy autosync deflection controller. It has full horizontal (H) and vertical (V) autosync capability and can be completely DC controlled. The chip has excellent geometry control functions, such as automatic correction of the East-West (EW) parabola during adjustment of vertical size and vertical shift. It also has a flexible switched mode power supply (SMPS) function block for feedback and feed forward converters and has X-ray protection. The chip is packaged in a SDIP32 package.
The TDA4858 is a high‑performance autosync deflection controller designed for video monitors. It provides full horizontal and vertical autosync, extensive geometry‑control functions, and a flexible switched‑mode power‑supply block. The device is fully DC‑controllable and includes X‑ray protection and a safe start‑up/shut‑down sequence for all power components.
The datasheet details the pin configuration, electrical specifications, functional blocks such as the frequency‑locked loop, PLL detectors, and video‑clamping generator. It also describes package dimensions (SDIP‑32) and soldering recommendations for reliable mounting.
| Supply voltage (Voc) | 9.2 V – 16 V |
|---|---|
| Supply current (Icc) | 49 mA |
| Horizontal shift adjustment range (AHPOS) | - to +10.5 % |
| Vertical size adjustment range (AVAMP) | 60 % – 100 % |
| Vertical shift adjustment range (AVPOS) | - to +411.5 % |
| Operating ambient temperature (Tamb) | 0 °C – 70 °C |
The device operates from 9.2 V up to 16 V.
CLBL provides a two‑level video‑clamping/vertical‑blanking pulse suitable for video ICs.
By applying a current to the HPOS pin, which linearly adjusts the phase between horizontal sync and the oscillator sawtooth.