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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.

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.

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