Overview
The UCC2802DG4, part of the UCC280x family, is a high-speed, low-power BiCMOS current-mode PWM controller produced by Texas Instruments. This integrated circuit is designed for off-line and DC-to-DC fixed frequency current-mode switching power supplies, requiring minimal external components. The UCC2802DG4 is pinout compatible with the UC3842 and UC3842A families, although it is not plug-in compatible. It offers advanced features such as internal full-cycle soft start, internal leading-edge blanking of the current sense signal, and a 1.5% tolerance voltage reference, making it an ideal choice for various power supply applications.
Key Specifications
| Parameter | Typical Value | Minimum Value | Maximum Value |
|---|---|---|---|
| Starting Supply Current | 100 μA | - | - |
| Operating Supply Current | 500 μA | - | - |
| Oscillator Frequency | 40 kHz to 52 kHz | 40 kHz | 52 kHz |
| Maximum Duty Cycle | 100% | 97% | 100% |
| Reference Voltage | 5 V | 4.925 V | 5.075 V |
| Turn-On Threshold | 12.5 V | - | - |
| Turn-Off Threshold | 8.3 V | - | - |
| Output Current (Peak) | ±1 A | - | - |
| Response Time (Current Sense to Gate Drive) | 70 ns | - | - |
| Operating Temperature Range | -40°C to 125°C | -40°C | 125°C |
Key Features
- BiCMOS process for low power consumption
- Low starting supply current: typically 100 μA
- Low operating supply current: typically 500 μA
- Pinout compatible with UC3842 and UC3842A families
- Internal full-cycle soft start and fault soft start
- Internal leading-edge blanking of the current sense signal
- 1.5% tolerance voltage reference
- Up to 1 MHz oscillator frequency
- 1-A totem-pole output
- 70-ns typical response from current sense to gate drive output
- Low self-biasing output during UVLO
- Very few external components required
Applications
- Switch mode power supplies (SMPS)
- DC-to-DC converters
- Power modules
- Automotive power supplies
- Battery-operated power supplies
Q & A
- What is the typical starting supply current of the UCC2802DG4?
The typical starting supply current is 100 μA.
- What is the maximum duty cycle of the UCC2802DG4?
The maximum duty cycle is approximately 100%.
- What is the reference voltage of the UCC2802DG4?
The reference voltage is 5 V with a tolerance of ±1.5%.
- What is the turn-on threshold voltage of the UCC2802DG4?
The turn-on threshold voltage is 12.5 V.
- What is the turn-off threshold voltage of the UCC2802DG4?
The turn-off threshold voltage is 8.3 V.
- What is the peak output current of the UCC2802DG4?
The peak output current is ±1 A.
- What is the response time from current sense to gate drive output?
The response time is typically 70 ns.
- What is the operating temperature range of the UCC2802DG4?
The operating temperature range is from -40°C to 125°C.
- Does the UCC2802DG4 have internal soft start and fault soft start features?
- What type of output does the UCC2802DG4 have?
The UCC2802DG4 has a 1-A totem-pole output.
