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UC3845BD1 from ST,ST Microelectronics

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UC3845BD1

Manufacturer: ST

High performance current mode PWM controller

Partnumber Manufacturer Quantity Availability
UC3845BD1 ST 2150 In Stock

Description and Introduction

High performance current mode PWM controller The UC3845BD1 is a high-performance current-mode PWM controller manufactured by STMicroelectronics.  

### **Specifications:**  
- **Input Voltage (VCC):** 8V to 30V  
- **Output Duty Cycle:** Up to 50% (adjustable)  
- **Operating Frequency:** Up to 500kHz  
- **Output Current (Peak):** ±1A (source/sink)  
- **Reference Voltage:** 5V (±1% accuracy)  
- **Start-up Current:** <1mA  
- **Undervoltage Lockout (UVLO):** 7.6V (on) / 7.2V (off)  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3845BD1 is designed for DC-DC converter applications, providing precise control for switching power supplies. It features a trimmed oscillator, temperature-compensated reference, and high-gain error amplifier.  

### **Features:**  
- **Current-Mode Operation** for improved transient response  
- **Automatic Feed-Forward Compensation**  
- **Latching PWM** for cycle-by-cycle current limiting  
- **Internal Trimmed Bandgap Reference**  
- **Low Start-up and Operating Current**  
- **Undervoltage Lockout (UVLO)** with hysteresis  

This device is commonly used in offline and DC-DC converters, battery chargers, and power supply systems.  

(Source: STMicroelectronics datasheet)

Partnumber Manufacturer Quantity Availability
UC3845BD1 MOTOROLA 295 In Stock

Description and Introduction

High performance current mode PWM controller The UC3845BD1 is a high-performance current-mode PWM controller manufactured by Motorola.  

### **Specifications:**  
- **Input Voltage (VCC):** 8.4V to 30V  
- **Output Current (Peak):** ±1A  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SOIC-8 (D1 suffix)  

### **Descriptions:**  
- Designed for offline and DC-DC converter applications.  
- Features current-mode control for improved transient response.  
- Includes a trimmed oscillator for precise duty cycle control.  
- Provides under-voltage lockout (UVLO) with hysteresis.  

### **Features:**  
- **Current-Mode Operation:** Enhances loop stability and simplifies feedback compensation.  
- **Automatic Feed-Forward Compensation:** Improves line regulation.  
- **Pulse-by-Pulse Current Limiting:** Protects against overloads.  
- **Internal Reference (5V ±1%):** Ensures stable regulation.  
- **Low Start-Up Current (<1mA):** Reduces power consumption during start-up.  
- **Soft-Start Capability:** Minimizes inrush current.  

This device is widely used in power supply designs, including flyback, forward, and boost converters.

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