SMPS Controller The KA3846 is a fixed frequency current-mode PWM controller manufactured by Fairchild Semiconductor (FSC). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:
### **Specifications:**
- **Input Voltage Range (VCC):** 8V to 40V
- **Operating Frequency Range:** Up to 500kHz
- **Output Drive Current (Peak):** ±500mA
- **Reference Voltage (VREF):** 5.1V (±1%)
- **Duty Cycle Range:** 0% to 100%
- **Quiescent Current (ICC):** 10mA (typical)
- **Operating Temperature Range:** -20°C to +85°C
### **Descriptions:**
- The KA3846 is a high-performance PWM controller designed for switching power supply applications.
- It operates in current-mode control, providing improved loop response and simplified feedback design.
- The device includes an onboard oscillator, error amplifier, current sensing comparator, and totem-pole output drivers.
### **Features:**
- **Current-Mode Operation:** Enhances line and load regulation.
- **Programmable Oscillator:** Allows flexible frequency setting via external components.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **Undervoltage Lockout (UVLO):** Ensures proper operation within the specified voltage range.
- **Synchronization Capability:** Can be synchronized to an external clock.
- **Error Amplifier:** High-gain op-amp for feedback loop control.
- **Double-Pulse Suppression:** Prevents multiple pulses in a single switching cycle.
- **Totem-Pole Outputs:** Suitable for driving power MOSFETs or bipolar transistors.
This information is based on the manufacturer's datasheet for the KA3846 by Fairchild Semiconductor (FSC).
