Current Mode PWM Controller The UC1842AJ is a pulse width modulation (PWM) controller manufactured by Texas Instruments (TI). Below are its key specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Texas Instruments (TI)
- **Part Number:** UC1842AJ
- **Type:** Current Mode PWM Controller
- **Operating Voltage Range:** 8V to 30V
- **Output Current (Peak):** 1A (sink/source)
- **Switching Frequency:** Up to 500 kHz
- **Duty Cycle Range:** 0% to 100%
- **Error Amplifier Bandwidth:** 3 MHz
- **Operating Temperature Range:** -40°C to +85°C
- **Package:** 8-Pin PDIP (Plastic Dual In-Line Package)
### **Descriptions:**
- The UC1842AJ is a high-performance fixed-frequency current-mode PWM controller.
- It is designed for DC-DC converter and power supply applications.
- The device includes an error amplifier, a current sensing comparator, a PWM latch, an oscillator, and a high-current totem-pole output driver.
- It provides precise voltage regulation and protection features.
### **Features:**
- **Current-Mode Control:** Enhances loop response and simplifies compensation.
- **Automatic Feed-Forward Compensation:** Improves line regulation.
- **Latching PWM:** Ensures single-pulse response per cycle.
- **Undervoltage Lockout (UVLO):** Ensures proper operation under low-voltage conditions.
- **Internal Soft-Start:** Reduces inrush current during startup.
- **High-Current Totem-Pole Output:** Directly drives power MOSFETs.
- **Programmable Oscillator:** Allows frequency adjustment with external components.
- **Error Amplifier with Reference:** Supports closed-loop feedback control.
- **Low Startup Current:** Typically 1 mA.
This information is based solely on the manufacturer's specifications for the UC1842AJ.
