Overview
The UC3843AD8 is a current-mode PWM controller from Texas Instruments, part of the UCx84xA family. This device is optimized for use in off-line and DC-DC converters, offering several improved features over its predecessors. It is designed to provide the necessary control for current-mode or switched-mode power supplies, with a low start-up current of less than 0.5 mA and an internally-trimmed bandgap reference. The UC3843AD8 operates within a temperature range of 0°C to 70°C and is available in an 8-pin SOIC (D) package.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | 0 to 70 | °C |
| Package Type | SOIC (D) | - |
| Number of Pins | 8 | - |
| Maximum Operating Frequency | Up to 500 kHz | - |
| Undervoltage Lockout (UVLO) On Threshold | 8.4 V | V |
| Undervoltage Lockout (UVLO) Off Threshold | 7.6 V | V |
| Maximum Duty Cycle | < 100% | - |
| Output Voltage (VREF) | 4.9 to 5.1 V | V |
| Start-Up Current | < 0.5 mA | mA |
| Oscillator Discharge Current | 7.6 to 8.8 mA | mA |
Key Features
- Optimized for Off-Line and DC-DC Converters
- Low Start-Up Current (< 0.5 mA)
- Trimmed Oscillator Discharge Current
- Automatic Feedforward Compensation
- Pulse-by-Pulse Current Limiting
- Enhanced Load Response Characteristics
- Undervoltage Lockout With Hysteresis
- Double Pulse Suppression
- High-Current Totem Pole Output
- Internally-Trimmed Bandgap Reference
- Up to 500 kHz Operation
- Create a Custom Design Using the UCx84xA With the WEBENCH Power Designer
Applications
- Switch Mode Power Supplies (SMPS)
- DC-DC Converters
- Power Modules
- Industrial Power Supplies (PSU)
- Battery Operated Power Supplies (PSU)
Q & A
- What is the operating temperature range of the UC3843AD8?
The operating temperature range is 0°C to 70°C.
- What is the maximum operating frequency of the UC3843AD8?
The maximum operating frequency is up to 500 kHz.
- What are the UVLO thresholds for the UC3843AD8?
The UVLO on threshold is 8.4 V, and the UVLO off threshold is 7.6 V.
- What is the maximum duty cycle of the UC3843AD8?
The maximum duty cycle is less than 100%.
- What is the start-up current of the UC3843AD8?
The start-up current is less than 0.5 mA.
- What are the typical applications of the UC3843AD8?
Typical applications include switch mode power supplies, DC-DC converters, power modules, industrial power supplies, and battery-operated power supplies.
- What package type is the UC3843AD8 available in?
The UC3843AD8 is available in an 8-pin SOIC (D) package.
- What is the internally-trimmed bandgap reference voltage of the UC3843AD8?
The internally-trimmed bandgap reference voltage is approximately 5 V.
- Does the UC3843AD8 support pulse-by-pulse current limiting?
Yes, the UC3843AD8 supports pulse-by-pulse current limiting.
- Can the UC3843AD8 be used with the WEBENCH Power Designer?
Yes, the UC3843AD8 can be used to create custom designs with the WEBENCH Power Designer.
