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UC3845P from TI,Texas Instruments

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UC3845P

Manufacturer: TI

Current Mode PWM Controller

Partnumber Manufacturer Quantity Availability
UC3845P TI 1526 In Stock

Description and Introduction

Current Mode PWM Controller The UC3845P is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Input Voltage (VCC):** 8.5V to 30V  
- **Output Duty Cycle:** 0% to 50% (adjustable)  
- **Switching Frequency:** Up to 500kHz  
- **Output Current (Peak):** 1A (sink/source)  
- **Reference Voltage:** 5V (±1%)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)  

### **Descriptions:**  
The UC3845P is designed for offline and DC-DC converter applications, providing precise control over power delivery. It features a trimmed oscillator for accurate duty cycle control, a temperature-compensated reference, and high-current totem-pole output for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Operation:** Improved loop response and simplified feedback compensation.  
- **Undervoltage Lockout (UVLO):** Ensures proper startup and shutdown.  
- **Cycle-by-Cycle Current Limiting:** Enhances system protection.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Low Startup Current:** Typically 1mA for efficient operation.  
- **Error Amplifier with High Gain-Bandwidth:** Ensures stable regulation.  

This IC is commonly used in power supply designs, including flyback, forward, and boost converters.  

(Source: Texas Instruments UC3845P Datasheet)

Partnumber Manufacturer Quantity Availability
UC3845P IT 164 In Stock

Description and Introduction

Current Mode PWM Controller The UC3845P is a high-performance current-mode PWM controller manufactured by Texas Instruments.  

### **Manufacturer:**  
- **Texas Instruments**  

### **IT Specifications:**  
- **Operating Voltage Range:** 8.5V to 30V  
- **Output Drive Current:** ±1A (peak)  
- **Switching Frequency:** Up to 500 kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** 1 MHz  
- **Start-up Current:** <1 mA  
- **Undervoltage Lockout (UVLO):** 8.4V (on), 7.6V (off)  
- **Current Sense Comparator Response Time:** 100 ns  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions and Features:**  
- **Current-Mode Control:** Provides cycle-by-cycle current limiting for improved load regulation.  
- **Adjustable Oscillator Frequency:** Allows precise control of switching frequency.  
- **Precision Reference:** Internal 5V bandgap reference with ±1% accuracy.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Pulse-by-Pulse Current Limiting:** Enhances system reliability.  
- **Totem-Pole Output:** Optimized for driving power MOSFETs.  
- **Low Power Consumption:** Suitable for energy-efficient designs.  
- **Package:** 8-Pin DIP (PDIP) or SOIC.  

The UC3845P is commonly used in switch-mode power supplies (SMPS), DC-DC converters, and offline power applications.

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