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UC2845AQ from TI,Texas Instruments

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UC2845AQ

Manufacturer: TI

Automotive Catalog Current-Mode PWM Controller

Partnumber Manufacturer Quantity Availability
UC2845AQ TI 18 In Stock

Description and Introduction

Automotive Catalog Current-Mode PWM Controller The UC2845AQ is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are the specifications, descriptions, and features based on factual information:

### **Specifications:**  
- **Manufacturer:** Texas Instruments (TI)  
- **Part Number:** UC2845AQ  
- **Type:** Current-Mode PWM Controller  
- **Topology:** Flyback, Forward, Boost, Buck  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** ±1 A (Peak)  
- **Supply Voltage (VCC):** 8 V to 30 V  
- **UVLO (Undervoltage Lockout):** 7.9 V (Turn-On), 7.6 V (Turn-Off)  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Gain Bandwidth:** 1 MHz  
- **Operating Temperature Range:** -40°C to +105°C  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC2845AQ is a fixed-frequency PWM controller designed for DC-DC converter applications. It operates in current-mode control, providing improved loop response and simplified feedback compensation. The device includes features such as undervoltage lockout (UVLO), cycle-by-cycle current limiting, and a totem-pole output stage for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Control:** Ensures cycle-by-cycle current limiting.  
- **Automatic Feed-Forward Compensation:** Simplifies feedback loop design.  
- **Undervoltage Lockout (UVLO):** Ensures proper startup and shutdown.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs (±1 A peak).  
- **Internal Trimmed Oscillator:** Reduces external component count.  
- **Pulse-by-Pulse Current Limiting:** Enhances system reliability.  
- **Latching PWM for Overvoltage Protection:** Prevents output overshoot.  
- **Low Startup and Operating Current:** Improves efficiency.  

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

Partnumber Manufacturer Quantity Availability
UC2845AQ UNITRODE 120 In Stock

Description and Introduction

Automotive Catalog Current-Mode PWM Controller The UC2845AQ is a high-performance current-mode PWM controller manufactured by UNITRODE. Below are its specifications, descriptions, and features:

### **Specifications:**
- **Input Voltage Range:** 8V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Drive Current:** ±1A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Quiescent Current:** 11mA (typical)  
- **Error Amp Bandwidth:** 1MHz (typical)  
- **Operating Temperature Range:** -40°C to +85°C  

### **Descriptions:**
- The UC2845AQ is a fixed-frequency pulse-width modulation (PWM) controller optimized for high-performance DC-DC converter applications.  
- It operates in current-mode control, providing improved loop response and simplified compensation.  
- The device includes an under-voltage lockout (UVLO) feature, ensuring reliable startup and shutdown.  
- It is available in a 16-pin DIP (Dual Inline Package) or SOIC (Small Outline IC) package.  

### **Features:**
- **Current-Mode Control:** Enhances transient response and simplifies feedback loop design.  
- **Automatic Feed-Forward Compensation:** Improves line regulation.  
- **Programmable Oscillator:** Allows frequency adjustment with external components.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Pulse-by-Pulse Current Limiting:** Provides cycle-by-cycle protection.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within voltage range.  
- **Totem-Pole Output:** Capable of driving power MOSFETs directly.  

The UC2845AQ is widely used in power supply designs, including flyback, forward, and boost converters.

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