Electronic Components Datasheet Search |
|
PSB2121-T Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
|
PSB2121-T Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
9 / 13 page Semiconductor Group 9 PSB 2121 At the beginning of the discharge period a positive synchronization pulse is generated at pin SYNC. Otherwise the PSB 2121 can be synchronized via pin SYNC to an external logic clock by programming the oscillator to free run at a frequency 10 % lower than the synchronization frequency. The PSB 2121 is synchronized by the rising edge of the sync. signal. So multiple devices can be synchronized together by programming one master unit for the desired frequency. Notice that the frequency of the output driver is half the oscillator frequency. The switching frequency as a function of R T and CT with RD = 0 is shown in figure 3. Figure 3 Switching Frequency Soft Start Circuit The soft start circuit protects the power transistors and rectifier diodes from high current surges during power supply turn-on. When the supply voltage is connected to the PSB 2121 the undervoltage lockout circuit holds the soft start capacitor voltage at zero. When the supply voltage reaches normal operating range an internal 4 µA current source will charge the external soft start capacitor. As the soft start voltage ramps up to + 5 volts, the duty cycle of the PWM linearly increases to whatever value the regulation loop requires. |
Similar Part No. - PSB2121-T |
|
Similar Description - PSB2121-T |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |