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UC3844BD from MOTOROLA

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UC3844BD

Manufacturer: MOTOROLA

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3844BD MOTOROLA 15 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3844BD is a high-performance current-mode PWM controller manufactured by Motorola. Below are its specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage (VCC):** 8.5V to 30V  
- **Output Current (Gate Drive):** ±1A (peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 50% (adjustable)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 8-Pin DIP (Dual In-Line Package)  

### **Descriptions:**  
The UC3844BD is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter and offline power supply applications. It operates in current-mode control, providing precise regulation and improved transient response. The device includes an under-voltage lockout (UVLO) feature, ensuring reliable startup and shutdown.  

### **Features:**  
- **Current-Mode Control:** Enhances loop response and simplifies compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper operation within the specified voltage range.  
- **Trimmed Oscillator Discharge Current:** Provides accurate duty cycle control.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Pulse-by-Pulse Current Limiting:** Protects against overload conditions.  
- **Low Startup and Operating Current:** Improves efficiency.  
- **Internal Reference Voltage:** 5V with ±1% tolerance.  

The UC3844BD is widely used in switch-mode power supplies (SMPS), battery chargers, and other power conversion applications.

Application Scenarios & Design Considerations

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Partnumber Manufacturer Quantity Availability
UC3844BD 21 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3844BD is a high-performance current-mode PWM controller manufactured by Texas Instruments. Below are its key specifications, descriptions, and features:  

### **Specifications:**  
- **Input Voltage Range:** 7.6V to 30V  
- **Output Frequency:** Up to 500 kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Output Current (Peak):** 1A (sink/source)  
- **Reference Voltage:** 5V (±1% accuracy)  
- **Start-Up Current:** <1mA  
- **Package Type:** SOIC-8  

### **Description:**  
The UC3844BD is a fixed-frequency pulse-width modulation (PWM) controller designed for DC-DC converter and offline power supply applications. It operates in current-mode control, providing improved line and load regulation. The device includes an oscillator, error amplifier, current-sensing comparator, and a totem-pole output stage.  

### **Features:**  
- **Current-Mode Control:** Enhances loop response and simplifies compensation.  
- **Under-Voltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **Programmable Oscillator:** Allows frequency adjustment with external components.  
- **Cycle-by-Cycle Current Limiting:** Protects against overloads.  
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.  
- **Soft-Start Capability:** Reduces inrush current during start-up.  
- **Low Start-Up and Operating Current:** Improves efficiency.  

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

Application Scenarios & Design Considerations

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Partnumber Manufacturer Quantity Availability
UC3844BD ST 300 In Stock

Description and Introduction

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER The UC3844BD is a high-performance current-mode PWM controller manufactured by STMicroelectronics.  

### **Specifications:**  
- **Input Voltage (VCC):** 8V to 30V  
- **Operating Frequency:** Up to 500kHz  
- **Output Duty Cycle:** 0% to 50%  
- **Output Current (Peak):** 1A (sink/source)  
- **Reference Voltage (VREF):** 5V ±1%  
- **Start-up Current:** <1mA  
- **Under-Voltage Lockout (UVLO):** 7.6V (turn-on), 7.2V (turn-off)  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** SO-8  

### **Descriptions:**  
The UC3844BD is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications. It features current-mode control for improved transient response and cycle-by-cycle current limiting. The device includes a trimmed oscillator, temperature-compensated reference, high-gain error amplifier, and a totem-pole output stage for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Operation** for precise control  
- **Automatic Feed-Forward Compensation** for improved line regulation  
- **Latching PWM** for cycle-by-cycle current limiting  
- **Internal Trimmed Bandgap Reference** (5V ±1%)  
- **Undervoltage Lockout (UVLO)** with hysteresis  
- **High-Current Totem-Pole Output** (1A peak)  
- **Low Start-up Current** (<1mA)  
- **SO-8 Package** for space-constrained applications  

This information is sourced from the manufacturer's datasheet.

Application Scenarios & Design Considerations

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

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