Current-Mode PWM Controller 8-PDIP 0 to 70 The UC3842NG4 is a high-performance current-mode PWM controller manufactured by Texas Instruments (TI). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Input Voltage Range:** 8V to 30V
- **Output Voltage:** 5V (Reference)
- **Operating Frequency:** Up to 500kHz
- **Output Current (Source/Sink):** 1A (Peak)
- **Duty Cycle Range:** 0% to 100%
- **Error Amplifier Gain Bandwidth:** 1MHz
- **Start-up Current:** <1mA
- **Undervoltage Lockout (UVLO):** 7.6V (Turn-On), 7.2V (Turn-Off)
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)
### **Descriptions:**
- The UC3842NG4 is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications.
- It operates in current-mode control, providing improved loop response and simplified feedback compensation.
- Includes a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, and high-gain error amplifier.
- Features a totem-pole output stage for driving power MOSFETs directly.
### **Features:**
- **Current-Mode Control:** Enhances line and load regulation.
- **Automatic Feed-Forward Compensation:** Simplifies feedback loop design.
- **Latching PWM for Cycle-by-Cycle Current Limiting:** Protects against overloads.
- **Internal Trimmed Bandgap Reference:** Ensures stable 5V output.
- **Undervoltage Lockout (UVLO):** Ensures proper start-up and shutdown.
- **Low Start-up and Operating Current:** Improves efficiency.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
The UC3842NG4 is commonly used in offline and DC-DC power supplies, battery chargers, and flyback converters.
