Overview
The UCC3803DG4 is a low-power BiCMOS current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This device is part of the UCC280x family, which is designed for high-speed, low-power applications in switching mode power supplies and DC-to-DC converters. The UCC3803DG4 integrates all the necessary control and drive components, minimizing the external parts count. It features a BiCMOS process, low starting and operating supply currents, and internal soft start and fault protection mechanisms.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Voltage | 12 | - | 12 | V |
| VCC Current | - | - | 30 | mA |
| Operating Supply Current | 0.5 | 1 | - | mA |
| Output Current | - | - | ±1 | A |
| Maximum Duty Cycle (UCC3803) | 48 | 49 | 50 | % |
| Current Sense Gain | 1.1 | 1.65 | 1.8 | V/V |
| CS Blank Time | 50 | 100 | 150 | ns |
| Overcurrent Threshold | 1.42 | 1.55 | 1.68 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
Key Features
- Low starting supply current: typically 100 μA and low operating supply current: typically 500 μA.
- Operation up to 1 MHz frequency.
- Internal soft start and fault soft start mechanisms.
- Internal leading-edge blanking of the current sense signal.
- 1-A totem-pole output with high-current power driver capable of driving the gate of a power MOSFET with peak currents exceeding 750 mA.
- 70-ns typical response from current-sense to gate drive output.
- 1.5% tolerance voltage reference.
- Digital current sense filtering and internal full-cycle soft start.
- Pinout compatible with UC3842 and UC3842A.
Applications
- Switch mode power supplies (SMPS).
- DC-to-DC converters.
- Power modules.
- Automotive power supply units (PSU).
- Battery-operated PSU.
Q & A
- What is the typical operating supply current of the UCC3803DG4?
The typical operating supply current is 500 μA. - What is the maximum duty cycle for the UCC3803?
The maximum duty cycle for the UCC3803 is approximately 49%. - Does the UCC3803DG4 have internal soft start and fault protection?
Yes, it features internal soft start and fault soft start mechanisms. - What is the purpose of the leading-edge blanking feature?
The leading-edge blanking masks the first 100 ns of the current sense signal, potentially eliminating the need for an RC current sense filter and preventing false triggering due to leading edge noises. - What is the output current capability of the UCC3803DG4?
The output is capable of driving the gate of a power MOSFET with peak currents exceeding 750 mA. - What is the recommended operating temperature range for the UCC3803DG4?
The recommended operating temperature range is from -40°C to 125°C. - Is the UCC3803DG4 RoHS compliant?
Yes, the UCC3803DG4 is RoHS compliant and free of Sb/Br. - What types of packages are available for the UCC3803DG4?
The UCC3803DG4 is available in SOIC, PDIP, and TSSOP packages. - What is the gain of the current sense amplifier in the UCC3803DG4?
The gain of the current sense amplifier is typically 1.65 V/V. - Does the UCC3803DG4 require external soft-start circuitry?
No, the UCC3803DG4 has built-in full-cycle soft start, eliminating the need for external soft-start circuitry.
