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TDA4857 from PHIPILS

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TDA4857

Manufacturer: PHIPILS, PHI

I2C-bus autosync deflection controller for PC monitors

Partnumber Manufacturer Quantity Availability
TDA4857 PHIPILS, PHI 19592 In Stock

Description and Introduction

I2C-bus autosync deflection controller for PC monitors The TDA4857 is a deflection controller IC manufactured by PHILIPS (now NXP Semiconductors). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Function:** Deflection controller for monitors (horizontal and vertical deflection control).  
- **Package:** Typically available in DIP (Dual In-line Package) or SO (Small Outline) package.  
- **Operating Voltage:** Typically operates at a supply voltage of **10.8V to 13.2V**.  
- **Horizontal Frequency Range:** Supports a range typically from **15 kHz to 150 kHz**.  
- **Vertical Frequency Range:** Typically **50 Hz to 160 Hz**.  
- **Protection Features:** Includes X-ray protection, under-voltage lockout (UVLO), and thermal shutdown.  

### **Descriptions:**
- The TDA4857 is designed for use in **multi-sync monitors**, providing synchronization and deflection control.  
- It integrates horizontal and vertical deflection circuits, reducing the need for external components.  
- It supports **auto-synchronization** for various input frequencies.  

### **Features:**
1. **Horizontal Deflection Control:**  
   - Adjustable horizontal drive pulse width.  
   - Soft-start function for reduced stress on components.  
   - Dynamic focus correction.  

2. **Vertical Deflection Control:**  
   - Vertical ramp generation.  
   - Vertical size and position adjustments.  

3. **Synchronization:**  
   - Automatic polarity detection for sync signals.  
   - Supports composite sync and separate H/V sync inputs.  

4. **Protection Circuits:**  
   - X-ray protection via HV shutdown.  
   - Under-voltage lockout (UVLO) prevents erratic operation.  

5. **Additional Functions:**  
   - B+ voltage regulation control.  
   - Beam current limiting.  

This information is based solely on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

I2C-bus autosync deflection controller for PC monitors

Alternative Part Number

  • LA7851 --: Deflection and sync signal processor for CRT monitors, functionally comparable to the TDA4857 horizontal/vertical deflection controller.
  • STV7778 --: CRT monitor deflection processor with similar horizontal/vertical drive functions, commonly used as a substitute in monitor chassis.
  • TDA9109 --: Deflection processor IC for CRT displays offering comparable sync and deflection control features for replacement designs.
  • KA2138 --: Monitor deflection/geometry controller in the same class as the TDA4857, commonly used as a substitute in CRT monitor horizontal/vertical deflection circuits.

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