Overview
The UCC35701D is a pulse width modulator (PWM) controller from Texas Instruments, designed for isolated switching power supplies using primary side control. This device is part of the UCC35701/UCC35702 family and is suitable for both off-line applications and DC/DC converter designs, such as in distributed power system architectures or as telecom power sources. It features a low startup current, enabling efficient off-line starting, and sufficient output drive to switch power MOSFETs at frequencies exceeding 500kHz.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Operating Frequency | 700 | kHz |
| Package Type | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | 0 to 70 | °C |
| UVLO Thresholds | 13V / 9V | V |
| Peak Gate Drive Output | 1A | - |
| Startup Current | 130µA | - |
| Operating Current | 750µA | - |
Key Features
- 700kHz operation
- Integrated oscillator/voltage feed forward compensation
- Accurate duty cycle limit and volt-second clamp
- Optocoupler interface
- Fault counting shutdown and fault latch off or automatic shutdown
- Soft stop optimized for synchronous rectification
- Pulse-by-pulse current limiting
- Independent SYNC input pin for external synchronization
Applications
The UCC35701D is designed for use in isolated switching power supplies, including off-line applications and DC/DC converter designs. It is particularly suited for distributed power system architectures and as a power source in telecom systems.
Q & A
- What is the operating frequency of the UCC35701D?
The UCC35701D operates at a frequency of 700kHz.
- What type of package does the UCC35701D come in?
The UCC35701D comes in a 14-pin SOIC (D) package.
- What is the operating temperature range of the UCC35701D?
The operating temperature range is from 0°C to 70°C.
- What are the UVLO thresholds for the UCC35701D?
The UVLO thresholds are 13V for turn-on and 9V for turn-off.
- What is the peak gate drive output of the UCC35701D?
The peak gate drive output is 1A.
- What is the startup current of the UCC35701D?
The startup current is 130µA.
- What is the operating current of the UCC35701D?
The operating current is 750µA.
- Does the UCC35701D support external synchronization?
Yes, it supports external synchronization via the SYNC pin.
- What kind of fault protection does the UCC35701D offer?
The UCC35701D offers pulse-by-pulse current limiting and fault counting shutdown with the ability to latch off after a programmable number of repetitive faults.
- Is the UCC35701D compatible with existing UCC3570 designs?
The UCC35701D is pin-to-pin compatible with the UCC3570 but is not a direct drop-in replacement. Minimal changes to the power supply PCB are required.
