Current-Mode PWM Controller The TL3845DR is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features:
### **Specifications:**
- **Input Voltage Range:** 7.6V to 30V
- **Operating Frequency:** Up to 500kHz
- **Output Duty Cycle:** 0% to 100%
- **Output Current (Source/Sink):** 1A (Peak)
- **Error Amplifier Gain Bandwidth:** 1MHz
- **Reference Voltage:** 5V (±1%)
- **Quiescent Current:** 11mA (Typical)
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** SOIC-8
### **Descriptions:**
The TL3845DR is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter applications. It features current-mode control for improved loop response and simplified compensation. The device includes an undervoltage lockout (UVLO) function, ensuring reliable operation under low input voltage conditions.
### **Features:**
- **Current-Mode Control:** Enhances transient response and simplifies feedback loop compensation.
- **Adjustable Oscillator Frequency:** Allows flexibility in design with external timing components.
- **Undervoltage Lockout (UVLO):** Ensures proper operation only when the supply voltage is within the specified range.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **Pulse-by-Pulse Current Limiting:** Provides cycle-by-cycle protection against overcurrent conditions.
- **Totem-Pole Output:** Capable of driving power MOSFETs directly.
- **High-Gain Error Amplifier:** Ensures precise voltage regulation.
- **Low Start-Up Current:** Minimizes power consumption during initial operation.
The TL3845DR is commonly used in power supply designs, including flyback, forward, and boost converters.
