| Patent Number |
Title Of Patent |
Date Issued |
| 8125799 |
Control circuits and methods for switching mode power supplies |
February 28, 2012 |
| Circuits and method for sensing a system output voltage change and transmitting an electrical signal to an auxiliary winding on the primary side. In an embodiment, a primary side controller detects the electrical signal and turns a power switch on and off to transfer energy from a pr |
| 8064231 |
Short circuit protection circuit for a pulse width modulation (PWM) unit |
November 22, 2011 |
| A short circuit protection circuit for a pulse width modulation (PWM) unit which includes a PWM logic control circuit, an under voltage lookout (UVLO) circuit and an internal clock circuit; wherein the UVLO circuit detecting a bias power (Vcc) and delivering an UVLO signal when the bias |
| 8045348 |
Switching mode power supply controller with high voltage startup circuits |
October 25, 2011 |
| A controller for a switching mode power supply includes two semiconductor chips. The first semiconductor chip has a high-voltage startup transistor coupled to a high voltage supply input terminal and configured to provide a charging current in a startup phase or protection mode of a swit |
