IC Phoenix logo

Home ›  U  › U7 > UC3843Q

UC3843Q from

Fast Delivery, Competitive Price @IC-phoenix

If you need more electronic components or better pricing, we welcome any inquiry.

0.000ms

UC3843Q

CURRENT-MODE PWM CONTROLLER

Partnumber Manufacturer Quantity Availability
UC3843Q 133 In Stock

Description and Introduction

CURRENT-MODE PWM CONTROLLER The UC3843Q is a high-performance current-mode PWM controller manufactured by Texas Instruments.  

### **Specifications:**  
- **Input Voltage Range:** 7.6V to 30V (operating), with UVLO thresholds of 8.4V (on) and 7.6V (off)  
- **Output Duty Cycle:** Up to 100%  
- **Switching Frequency:** Up to 500kHz  
- **Peak Output Current:** ±1A (source/sink)  
- **Error Amplifier Bandwidth:** 1MHz  
- **Reference Voltage:** 5V (±1% accuracy)  
- **Operating Temperature Range:** -40°C to +105°C  
- **Package:** SOIC-8  

### **Descriptions:**  
The UC3843Q is a fixed-frequency PWM controller optimized for DC-DC converter applications. It features current-mode control for improved loop response and includes a built-in trimmed oscillator, temperature-compensated reference, high-gain error amplifier, current sensing comparator, and a totem-pole output stage.  

### **Features:**  
- **Current-Mode Control:** Provides cycle-by-cycle current limiting  
- **Automatic Feed-Forward Compensation:** Simplifies feedback loop design  
- **Under-Voltage Lockout (UVLO):** Ensures proper startup and shutdown  
- **Latching PWM:** Prevents multiple pulses during fault conditions  
- **Low Startup Current:** Typically 0.5mA  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs  

This device is commonly used in offline and DC-DC power supplies, battery chargers, and flyback converters.

Partnumber Manufacturer Quantity Availability
UC3843Q UNITRODE 4983 In Stock

Description and Introduction

CURRENT-MODE PWM CONTROLLER The UC3843Q is a high-performance current-mode PWM controller manufactured by UNITRODE. Below are its key specifications, descriptions, and features:  

### **Specifications:**  
- **Input Voltage Range:** 8.5V to 30V (start-up voltage: 16V typical, UVLO turn-off: 10V typical)  
- **Operating Frequency:** Up to 500 kHz  
- **Output Drive Current:** ±1A (peak)  
- **Duty Cycle Range:** 0% to 100%  
- **Reference Voltage:** 5V (±1% tolerance)  
- **Current Sense Comparator Threshold:** 1V  
- **Low Quiescent Current:** 11mA (typical)  
- **Package:** SOIC-8 (Q suffix indicates industrial temperature range)  

### **Descriptions:**  
- The UC3843Q is a fixed-frequency PWM controller optimized for DC-DC converter applications.  
- It operates in current-mode control, providing improved loop response and simplified feedback compensation.  
- Includes under-voltage lockout (UVLO), cycle-by-cycle current limiting, and a totem-pole output stage for driving power MOSFETs.  

### **Features:**  
- **Current-Mode Operation:** Enhances line and load regulation.  
- **Automatic Feed-Forward Compensation:** Simplifies feedback design.  
- **Latching PWM for Cycle-by-Cycle Current Limiting:** Protects against overcurrent conditions.  
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.  
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.  
- **Internal Trimmed Bandgap Reference:** Provides stable 5V reference.  
- **Industrial Temperature Range:** -40°C to +85°C.  

This information is sourced from UNITRODE's datasheet for the UC3843Q.

Partnumber Manufacturer Quantity Availability
UC3843Q UC 15 In Stock

Description and Introduction

CURRENT-MODE PWM CONTROLLER The UC3843Q is a high-performance current-mode PWM controller manufactured by Texas Instruments.  

### **Key Specifications:**  
- **Input Voltage Range:** 7.6V to 30V (start-up), 7.6V to 25V (operating)  
- **Output Current:** Up to 1A (peak)  
- **Switching Frequency:** Up to 500kHz  
- **Duty Cycle Range:** 0% to 100%  
- **Error Amplifier Bandwidth:** 1MHz  
- **Reference Voltage Accuracy:** ±1% (5V)  
- **Operating Temperature Range:** -40°C to +105°C  
- **Package:** SOIC-8  

### **Descriptions and Features:**  
- **Current-Mode Control:** Provides cycle-by-cycle current limiting for improved transient response.  
- **Undervoltage Lockout (UVLO):** Ensures reliable operation with a tight UVLO threshold.  
- **Adjustable Oscillator Frequency:** Allows flexibility in design with an external resistor and capacitor.  
- **Pulse-by-Pulse Current Limiting:** Enhances system protection.  
- **Soft-Start Capability:** Reduces inrush current during startup.  
- **Low Startup Current:** Typically 0.5mA for efficient operation.  
- **High-Current Totem Pole Output:** Directly drives power MOSFETs.  
- **Internal Trimmed Bandgap Reference:** Ensures stable voltage regulation.  

The UC3843Q is commonly used in offline and DC-DC converters, power supplies, and battery chargers.

Request Quotation

For immediate assistance, call us at +86 533 2716050 or email [email protected]

Part Number Quantity Target Price($USD) Email Contact Person
We offer highly competitive channel pricing. Get in touch for details.

Specializes in hard-to-find components chips