DESCRIPTION
TSM121 incorporates all the necessary functions for proper PWM generation and pulse transformer drive to be adapted easily in the PC SMPS power supplies, and all the Housekeeping features which allow safe operation in all conditions, and very high integration. TSM121 integrates two independent Voltage References which are uncommitted to ensure safe Regulation and Protection by the same chip. APPLICATION s Primary PWM and secondary housekeeping in PC/Server SMPS using Half Bridge topology January 2001 1/12 Free Datasheet TSM121 PIN DESCRIPTION
Name Vcc Gnd Pin # 2 21 Type Power Supply Power Supply Function Positive Power Supply line. Ground. 0V Reference for all voltages. Housekeeping Vs12 Vs5 Vs33 Tuv EP 15 14 13 18 16 Analog input Analog input Analog input Timing capacitor Analog input Over & under voltage sense input dedicated to the 12V line Over & under voltage sense input dedicated to the 5V line Over & under voltage sense input dedicated to the 3.3V line Adjustable Under voltage blanking delay at Power Up (setting capacitor) Extra Protection (Over voltage for -5V and/or -12V line or Primary OverPower protection).
STMicroelectronics
