| Topology | Flyback, Boost, |
| Duty cycle (Max) (%) | 99 |
| Vin (Max) (V) | 15 |
| UVLO thresholds on/off (V) | 9.9/9.1 |
| Features | Multi-topology, Soft Start, Synchronization Pin |
| Operating temperature range (C) | 0 to 70 |
| Switching frequency (Max) (kHz) | 700 |
| Rating | Catalog |
| Gate drive (Typ) (A) | 1 |
- 700kHz Operation
- Integrated Oscillator/Voltage Feed Forward Compensation
- Accurate Duty Cycle Limit
- Accurate Volt-second Clamp
- Optocoupler Interface
- Fault Counting Shutdown
- Fault Latch off or Automatic Shutdown
- Soft Stop Optimized for Synchronous Rectification
- 1A Peak Gate Drive Output
- 130μA Start-up Current
- 750μA Operating Current
The UCC35701/UCC35702 family of pulse width modulators is intended for isolated switching power supplies using primary side control. They can be used for both off-line applications and DC/DC converter designs such as in a distributed power system architecture or as a telecom power source.
The devices feature low startup current, allowing for efficient off-line starting, yet have sufficient output drive to switch power MOSFETs in excess of 500kHz.
Voltage feed forward compensation is operational over a 5:1 input range and provides fast and accurate response to input voltage changes over a 4:1 range. An accurate volt-second clamp and maximum duty cycle limit are also featured.
Fault protection is provided by pulse by pulse current limiting as well as the ability to latch off after a programmable number of repetitive faults has occurred.
Two UVLO options are offered. UCC35701 family has turn-on and turn-off thresholds of 13V/9V and UCC35702 family has thresholds of 9.6V/8.8V.
The UCC35701/2 and the UCC25701/2 are offered in the 14 pin SOIC (D), 14 pin PDIP (N) or in 14 pin TSSOP (PW) packages. The UCC15701/2 is offered in the 14 pin CDIP (J) package.
