Overview
The UCC35701DTR, produced by Texas Instruments, is a member of the UCC35701/2 family of advanced voltage mode pulse width modulators. These devices are designed for use in isolated switching power supplies, particularly those employing primary side control. They are suitable for both off-line applications and DC/DC converter designs, such as in distributed power system architectures or as telecom power sources.
The UCC35701DTR features low startup current, enabling efficient off-line starting, and sufficient output drive to switch power MOSFETs at frequencies exceeding 500kHz. It includes voltage feed forward compensation, an accurate volt-second clamp, and maximum duty cycle limit, ensuring fast and accurate responses to input voltage changes.
Key Specifications
| Parameter | Min | Max | Units | |
|---|---|---|---|---|
| Supply Voltage (VDD) | - | - | 15 | V |
| Supply Current (IDD) | - | - | 20 | mA |
| UVLO Start Threshold (UCC35701) | 12 | 13 | 14 | V |
| UVLO Stop Threshold (UCC35701) | 8 | 9 | 10 | V |
| Startup Current (VDD = 11V) | 130 | 200 | - | μA |
| Operating Current (VDD = 11V) | 0.75 | 1.5 | - | mA |
| Output Current (OUT) DC | - | - | ±180 | mA |
| Frequency Range | 90 | 100 | 110 | kHz |
| Peak Gate Drive Output | - | - | 1 | A |
Key Features
- 700kHz operation with integrated oscillator and voltage feed forward compensation
- Accurate duty cycle limit and volt-second clamp
- Optocoupler interface for isolated feedback
- Fault counting and shutdown or automatic shutdown with soft stop capability
- 1A peak gate drive output
- Low startup current of 130μA and operating current of 750μA
- Programmable oscillator timing using RT and CT circuits
- Independent SYNC input pin for external synchronization
- Pulse-by-pulse current limiting and fault latch off
Applications
The UCC35701DTR is designed for use in various power supply applications, including:
- Isolated switching power supplies with primary side control
- Off-line power supplies
- DC/DC converter designs in distributed power system architectures
- Telecom power sources
- Synchronous rectification circuits
Q & A
- What is the primary application of the UCC35701DTR?
The UCC35701DTR is primarily used in isolated switching power supplies with primary side control, including off-line power supplies and DC/DC converter designs.
- What is the typical operating frequency of the UCC35701DTR?
The typical operating frequency is around 100kHz, with a range of 90kHz to 110kHz.
- What is the peak gate drive output of the UCC35701DTR?
The peak gate drive output is 1A.
- How does the UCC35701DTR handle fault conditions?
The device features pulse-by-pulse current limiting and fault latch off after a programmable number of repetitive faults.
- What are the UVLO thresholds for the UCC35701DTR?
The UVLO start and stop thresholds are 13V and 9V, respectively.
- What is the startup current of the UCC35701DTR?
The startup current is 130μA.
- Can the UCC35701DTR be synchronized externally?
- What is the operating current of the UCC35701DTR?
The operating current is 750μA.
- What package options are available for the UCC35701DTR?
The device is available in SOIC-14, PDIP-14, and TSSOP-14 packages.
- Is the UCC35701DTR RoHS compliant?
