Current-Mode PWM Controller The TL3842 is a pulse-width modulation (PWM) controller IC manufactured by Texas Instruments (TI). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Input Voltage Range:** 8V to 30V (start-up voltage ~16V typical)
- **Operating Frequency:** Up to 500 kHz (adjustable with external components)
- **Output Duty Cycle:** 0% to 100% (maximum)
- **Output Current (Source/Sink):** 200 mA (peak)
- **Reference Voltage:** 5V (±1% tolerance)
- **Error Amplifier Gain Bandwidth:** 1 MHz (typical)
- **Operating Temperature Range:** -40°C to +85°C (industrial grade)
- **Package Options:** 8-pin PDIP, SOIC
### **Descriptions:**
- The TL3842 is a current-mode PWM controller designed for DC-DC converter and power supply applications.
- It provides precise voltage regulation with features like cycle-by-cycle current limiting and under-voltage lockout (UVLO).
- The device includes an internal oscillator, error amplifier, current sensing comparator, and a totem-pole output driver.
### **Features:**
- **Current-Mode Control:** Enhances loop response and simplifies compensation.
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within the specified voltage range.
- **Adjustable Oscillator Frequency:** Set via external resistor and capacitor.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
- **Low Standby Current:** Typically 1 mA (when disabled).
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.
This information is based on TI's datasheet for the TL3842. For detailed application notes, refer to the official documentation.
