Overview
The UCC2802D, produced by Texas Instruments, is a high-speed, low-power integrated circuit designed for off-line and DC-to-DC fixed frequency current-mode switching power supplies. This device is part of the UCC2800 family, which offers a range of features and specifications tailored for various power supply applications. The UCC2802D is notable for its low power consumption, internal soft start, and internal leading-edge blanking of the current sense signal, making it suitable for a variety of power supply designs with minimal parts count.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Maximum Duty Cycle | 97 | 99 | 100 | % |
| Reference Voltage | 4.925 | 5 | 5.075 | V |
| Turn-On Threshold | 12.5 | 13.5 | V | |
| Turn-Off Threshold | 7.6 | 8.3 | 9 | V |
| Start to Stop Hysteresis | 3.5 | 4.2 | 5.1 | V |
| Current Sense Gain | 1.1 | 1.65 | 1.8 | V/V |
| Overcurrent Threshold Voltage | 1.42 | 1.55 | 1.68 | V |
| Output Rise Time (CL = 1 nF) | 41 | 70 | ns | |
| Output Fall Time (CL = 1 nF) | 44 | 75 | ns | |
| Operating Supply Current | 0.5 | 1 | mA |
Key Features
- Bi-CMOS process for low power consumption and high speed operation.
- Low starting supply current: typically 100 μA.
- Low operating supply current: typically 500 μA.
- Operation up to 1 MHz.
- Internal soft start and internal fault soft start.
- Internal leading-edge blanking of the current sense signal.
- 1-A totem-pole output.
- 70-ns typical response from current-sense to gate drive output.
- 1.5% tolerance voltage reference.
- Same pinout as UC3842 and UC3842A for compatibility.
Applications
- Switch mode power supplies (SMPS).
- DC-to-DC converters.
- Power modules.
- Automotive power supplies.
- Battery-operated power supplies.
Q & A
- What is the maximum duty cycle of the UCC2802D?
The maximum duty cycle of the UCC2802D is 100%.
- What is the reference voltage of the UCC2802D?
The reference voltage of the UCC2802D is 5 V with a tolerance of ±0.075 V.
- What are the turn-on and turn-off thresholds for the UCC2802D?
The turn-on threshold is 12.5 V, and the turn-off threshold is 8.3 V.
- What is the current sense gain of the UCC2802D?
The current sense gain is between 1.1 and 1.8 V/V.
- What is the overcurrent threshold voltage of the UCC2802D?
The overcurrent threshold voltage is between 1.42 and 1.68 V.
- How fast is the response from current-sense to gate drive output?
The response time is typically 70 ns.
- What is the operating supply current of the UCC2802D?
The operating supply current is typically 1 mA.
- Is the UCC2802D compatible with other devices?
Yes, it has the same pinout as UC3842 and UC3842A.
- What are some common applications of the UCC2802D?
Common applications include switch mode power supplies, DC-to-DC converters, power modules, automotive power supplies, and battery-operated power supplies.
- What is the maximum operating frequency of the UCC2802D?
The UCC2802D can operate up to 1 MHz.
