Current-Mode PWM Controller The TL3845D is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI).
### **Specifications:**
- **Input Voltage Range:** 8.5V to 30V
- **Operating Frequency:** Up to 500 kHz
- **Output Duty Cycle:** 0% to 100%
- **Peak Output Current:** ±1A (source/sink)
- **Error Amplifier Bandwidth:** 1 MHz
- **Reference Voltage Accuracy:** ±1% (5V)
- **Low Start-Up Current:** <1mA
- **Undervoltage Lockout (UVLO):** 8V (on), 7.6V (off)
- **Package:** 8-Pin SOIC (D)
### **Descriptions:**
The TL3845D is a fixed-frequency pulse-width modulation (PWM) controller optimized 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 to ensure reliable operation under low-voltage conditions.
### **Features:**
- **Current-Mode Control:** Enhances transient response and simplifies feedback loop compensation.
- **Programmable Oscillator:** Allows flexible frequency setting with an external resistor and capacitor.
- **Precision Reference:** 5V ±1% for stable regulation.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **Pulse-by-Pulse Current Limiting:** Provides cycle-by-cycle protection.
- **Low Power Consumption:** Optimized for efficiency.
The TL3845D is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.
