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UC3845T from ST,ST Microelectronics

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UC3845T

Manufacturer: ST

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3845T ST 140 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3845T is a current-mode PWM controller manufactured by STMicroelectronics. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** STMicroelectronics  
- **Type:** Current-Mode PWM Controller  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Switching Frequency:** Up to 500 kHz  
- **Output Drive Current:** 1A (Peak)  
- **Supply Voltage (VCC):** 8.4V to 30V  
- **UVLO (Undervoltage Lockout):**  
  - Turn-On: 8.4V (Typical)  
  - Turn-Off: 7.6V (Typical)  
- **Duty Cycle Range:** 0% to 50% (Adjustable)  
- **Error Amplifier Bandwidth:** 1 MHz  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SO-8  

### **Descriptions:**
The UC3845T is a fixed-frequency PWM controller optimized for high-performance DC-DC converters. It provides precise duty cycle control with current-mode operation, improving loop response and simplifying compensation. The device includes an onboard error amplifier, oscillator, current sensing comparator, and a totem-pole output driver.  

### **Features:**
- **Current-Mode Control:** Enhances line and load regulation.  
- **Adjustable Oscillator Frequency:** Set by external RC components.  
- **Internal Trimmed Bandgap Reference:** 5V ±1% accuracy.  
- **Cycle-by-Cycle Current Limiting:** Protects against overcurrent.  
- **Soft-Start Capability:** Reduces inrush current.  
- **Latching PWM for Overvoltage Protection:** Ensures safety during faults.  
- **Low Startup Current:** Typically 0.5mA.  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Partnumber Manufacturer Quantity Availability
UC3845T STM 143 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3845T is a high-performance current-mode PWM controller manufactured by STMicroelectronics (STM). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:  

### **Specifications:**  
- **Manufacturer:** STMicroelectronics (STM)  
- **Type:** Current-Mode PWM Controller  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** ±1A (peak)  
- **Supply Voltage (VCC):** 8.5V to 30V  
- **Start-up Current:** <1mA  
- **Duty Cycle Range:** 0% to 50% (adjustable)  
- **Error Amplifier Bandwidth:** 1 MHz  
- **Reference Voltage:** 5V (±1%)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SO-8, DIP-8  

### **Descriptions:**  
The UC3845T is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converters. It provides precise voltage regulation with current-mode control, enhancing loop response and simplifying compensation. The device includes an under-voltage lockout (UVLO) feature for reliable start-up and shutdown.  

### **Features:**  
- **Current-Mode Control:** Improves transient response and simplifies loop compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Trimmed Oscillator Discharge Current:** Allows precise duty cycle control.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Pulse-by-Pulse Current Limiting:** Enhances system protection.  
- **Low Start-up and Operating Current:** Reduces power consumption.  
- **Internal Reference Voltage:** 5V (±1%) for stable regulation.  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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