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UC2845D8 from TI,Texas Instruments

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UC2845D8

Manufacturer: TI

Current-Mode PWM Controller

Partnumber Manufacturer Quantity Availability
UC2845D8 TI 3275 In Stock

Description and Introduction

Current-Mode PWM Controller The UC2845D8 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:  

### **Specifications:**  
- **Manufacturer:** Texas Instruments (TI)  
- **Part Number:** UC2845D8  
- **Package:** SOIC-8  
- **Topology:** Current-Mode PWM Controller  
- **Operating Voltage Range:** 7.6V to 30V  
- **Output Current (Source/Sink):** 1A (Peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** 1MHz  
- **Start-Up Current:** <1mA  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**  
The UC2845D8 is a fixed-frequency PWM controller optimized for high-performance power supply applications. It features current-mode control for improved loop response and includes built-in protections such as under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a programmable soft-start function.  

### **Features:**  
- **Current-Mode Control:** Provides inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within the 7.6V to 30V range.  
- **Programmable Soft-Start:** Reduces inrush current during startup.  
- **High-Current Totem-Pole Output:** 1A peak output drive for direct MOSFET driving.  
- **Internal Trimmed Bandgap Reference:** 5V ±1% accuracy.  
- **Low Start-Up and Operating Current:** Enhances efficiency.  
- **500kHz Oscillator:** Supports high-frequency switching.  
- **Dual-Pulse Suppression:** Prevents double pulsing.  

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

Partnumber Manufacturer Quantity Availability
UC2845D8 TI/UNITRODE 70 In Stock

Description and Introduction

Current-Mode PWM Controller The UC2845D8 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI) under the UNITRODE brand. Below are its key specifications, descriptions, and features:

### **Specifications:**
- **Output Type:** PWM (Pulse Width Modulation)  
- **Topology:** Current-Mode Control  
- **Frequency Range:** Up to 500 kHz  
- **Duty Cycle Max:** 50%  
- **Supply Voltage (VCC):** 8.6V to 30V  
- **Start-Up Voltage:** 16V (typical)  
- **UVLO (Undervoltage Lockout):** 8.4V (turn-on), 7.6V (turn-off)  
- **Output Current (Source/Sink):** 1A (peak)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin SOIC (D8)  

### **Descriptions:**
- The UC2845D8 is a fixed-frequency PWM controller optimized for high-performance DC-DC converters.  
- It uses current-mode control for improved loop response and simplified compensation.  
- Features include an integrated oscillator, error amplifier, current sensing comparator, and totem-pole output driver.  
- Designed for offline and DC-DC power supplies with precise regulation.  

### **Features:**
- **Current-Mode Operation:** Provides inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation.  
- **Automatic Feed-Forward Compensation:** Ensures consistent gain over input voltage variations.  
- **Trimmed Oscillator Discharge Current:** Tight frequency control (±6% accuracy).  
- **Latching PWM:** Ensures single-pulse operation per cycle.  
- **Undervoltage Lockout (UVLO):** Guarantees proper start-up and shutdown behavior.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs (1A peak).  
- **Low Start-Up and Operating Current:** Reduces power consumption.  

This information is strictly based on the manufacturer's datasheet for the UC2845D8 from TI/UNITRODE.

Partnumber Manufacturer Quantity Availability
UC2845D8 UCC 1358 In Stock

Description and Introduction

Current-Mode PWM Controller The UC2845D8 is a high-performance current-mode PWM controller manufactured by UCC (Unitrode, now part of Texas Instruments).  

### **Specifications:**  
- **Topology:** Current-mode PWM controller  
- **Input Voltage Range:** Up to 30V (start-up), 10V to 30V (operating)  
- **Output Duty Cycle:** 0% to 100%  
- **Switching Frequency:** Up to 500kHz  
- **Output Current (Source/Sink):** 1A (peak)  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-pin SOIC (D8)  

### **Descriptions and Features:**  
- **Current-Mode Control:** Provides cycle-by-cycle current limiting for improved transient response.  
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Adjustable Oscillator Frequency:** Allows external timing components for frequency control.  
- **Soft-Start Capability:** Reduces inrush current during start-up.  
- **Error Amplifier:** High-gain bandwidth for precise voltage regulation.  
- **Pulse-by-Pulse Current Limiting:** Enhances protection against overloads.  
- **Totem-Pole Output:** Directly drives power MOSFETs.  
- **Low Start-Up Current:** Typically 1mA for efficient operation.  

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

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