High Performance Current Mode Controller The UC3845BVN is a high-performance current-mode PWM controller manufactured by Motorola (MOT). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Motorola (MOT)
- **Type:** Current-Mode PWM Controller
- **Topology:** Flyback, Forward, Boost, Buck
- **Operating Frequency:** Up to 500 kHz
- **Output Drive Current:** ±1 A (Peak)
- **Duty Cycle Range:** 0% to 100%
- **Supply Voltage (VCC):** 8.2 V to 30 V
- **UVLO (Undervoltage Lockout):** On: 8.4 V (Typ), Off: 7.6 V (Typ)
- **Reference Voltage:** 5 V (±1%)
- **Current Sense Input Voltage:** 1 V (Threshold)
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 8-Pin DIP or SOIC
### **Descriptions:**
- The UC3845BVN is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converter applications.
- It features a trimmed oscillator for precise duty cycle control, current-mode operation for improved transient response, and cycle-by-cycle current limiting.
- The device includes a high-gain error amplifier, a current-sensing comparator, and a totem-pole output stage for driving power MOSFETs.
### **Features:**
- **Current-Mode Control:** Provides inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation.
- **Automatic Feedforward Compensation:** Ensures consistent response over varying input voltages.
- **Trimmed Oscillator:** Precise frequency control with external timing components.
- **Undervoltage Lockout (UVLO):** Ensures proper startup and shutdown behavior.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs with ±1 A peak current.
- **Soft-Start Capability:** Reduces inrush current during startup.
- **Low Startup Current:** Typically 0.5 mA for efficient operation.
- **Error Amplifier with Wide Bandwidth:** Supports fast transient response.
This information is based solely on the manufacturer's datasheet and technical documentation.
