UCC15702

Features:

• 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
• 130A Start-up Current
• 750A Operating Current


Pinout




Specifications

Supply voltage (Supply current limited to 20mA) . . . . . . . . 15V
Supply Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Input pins ( ILIM,VFF,RT,CT,VSCLAMP,SYNC,SS) . . . . . . 6V
Output Current (OUT) DC. . . . . . . . . . . . . . . . . . . . . +/180mA
Output Current (OUT) Pulse (0.5ms) . . . . . . . . . . . . . . +/1.2A
Storage Temperature. . . . . . . . . . . . . . . . . . . 65 to +150
Junction Temperature. . . . . . . . . . . . . . . . . . . 55 to +150
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . +300
Note: All voltages are with respect to GND. Currents are positive into the specified terminal. Consult Packaging Section of the Databook for thermal limitations and considerations of packages.


Description

The UCC15702 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 UCC15702 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 of UCC15702 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 of UCC15702 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 UCC15702 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.