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TL3843 from TI,Texas Instruments

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TL3843

Manufacturer: TI, TEXAS

Current-Mode PWM Controller

Partnumber Manufacturer Quantity Availability
TL3843 TI, TEXAS 81 In Stock

Description and Introduction

Current-Mode PWM Controller The TL3843 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V (operating)  
- **Reference Voltage:** 5V (with ±1% tolerance)  
- **Switching Frequency:** Up to 500 kHz (adjustable with external components)  
- **Output Duty Cycle:** 0% to 100% (maximum)  
- **Peak Output Current:** ±1A (source/sink)  
- **Error Amplifier Bandwidth:** 1 MHz (typical)  
- **Operating Temperature Range:** -40°C to +85°C (industrial)  
- **Package Options:** 8-pin PDIP, SOIC  

### **Descriptions:**  
- The TL3843 is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter applications.  
- It operates in current-mode control, providing improved loop response and simplified feedback compensation.  
- Includes an undervoltage lockout (UVLO) feature to ensure reliable startup and shutdown.  
- Suitable for offline and DC-DC power supplies, including flyback, forward, and boost converters.  

### **Features:**  
- **Current-Mode Control:** Enhances line and load regulation.  
- **Adjustable Oscillator Frequency:** Set via external resistor and capacitor.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within voltage limits.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.  
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.  
- **Low Startup Current:** Typically 0.5 mA for efficient power-up.  

For detailed application-specific information, refer to the official TI datasheet.

Application Scenarios & Design Considerations

Current-Mode PWM Controller

Alternative Part Number

  • UC3843 --: Industry-standard current-mode PWM controller in the same family with nearly identical functionality and pinout, widely available and often used as a direct substitute.
  • SG3843 --: Equivalent current-mode PWM controller with matching electrical characteristics and pinout, suitable as a drop-in replacement from an alternate vendor.
  • KA3843 --: Pin-compatible current-mode PWM controller with comparable specifications, offering a second-source option for the TL3843.
  • UC3843AN --: Industry-standard current-mode PWM controller in the same family with equivalent function and pinout, widely available and directly interchangeable in most designs.
  • SG3843N --: Second-source 3843 current-mode controller with matching electrical characteristics and DIP-8 pinout, suitable as a drop-in replacement.

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