Current Mode PWM Controller The UC3842ANG4 is a high-performance current-mode PWM controller manufactured by Texas Instruments. Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Manufacturer:** Texas Instruments
- **Category:** Integrated Circuits (ICs)
- **Family:** PMIC - Voltage Regulators - DC DC Switching Controllers
- **Topology:** Boost, Flyback, Forward
- **Control Mode:** Current Mode
- **Output Type:** Transistor Driver
- **Number of Outputs:** 1
- **Switching Frequency:** Up to 500 kHz
- **Duty Cycle (Max):** 100%
- **Supply Voltage (Vcc):** 8V to 30V
- **Operating Temperature Range:** -40°C to +85°C
- **Package / Case:** PDIP-8 (Plastic Dual In-Line Package)
- **Mounting Type:** Through Hole
### **Descriptions:**
- The UC3842ANG4 is a fixed-frequency pulse-width modulation (PWM) controller optimized for DC-DC converter applications.
- It provides precise duty cycle control with current-mode operation for improved loop response and simplified compensation.
- The device includes an oscillator, error amplifier, current sensing comparator, PWM latch, and a high-current totem-pole output driver.
- It is widely used in power supply designs, including offline and DC-DC converters.
### **Features:**
- **Current-Mode Operation:** Provides inherent line feedforward, cycle-by-cycle current limiting, and simplified loop compensation.
- **Automatic Feedforward Compensation:** Ensures consistent response to input voltage variations.
- **Undervoltage Lockout (UVLO):** Ensures proper operation with a startup threshold of 16V (typical) and hysteresis of 6V.
- **Trimmed Oscillator Discharge Current:** Allows precise frequency control.
- **High-Current Totem-Pole Output:** Capable of driving power MOSFETs directly.
- **Internal Reference Voltage:** 5V with ±1% tolerance.
- **Low Startup and Operating Current:** Reduces power consumption.
- **Cycle-by-Cycle Current Limiting:** Enhances system protection.
This information is strictly based on the manufacturer's datasheet and technical documentation.
