Electronic Components Datasheet Search |
|
FAN7554 Datasheet(PDF) 11 Page - Fairchild Semiconductor |
|
FAN7554 Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 22 page FAN7554 11 Gate Driver The gate drive circuit has the totem-pole output configuration. The output has 1A peak current and 200mA average current drive ability. ON/OFF Control The FAN7554 is able to use the feedback pin for ON/OFF control by placing NPN transistor between the cathode of the KA431 and ground as shown in figure 19. When the transistor turns on, the current flows through the photo diode and saturates the photo transistor. As a result, the feedback voltage is dropped to zero. When the feedback voltage is below 0.3V, the soft start voltage starts to discharge by connecting the internal resistor 1k Ω in parallel with the external capacitor Cs. When the soft start voltage becomes less than 1.5V, all the blocks in the FAN7554 are turned off , with the exceptions of the UVLO block and ON/OFF control block. The operation current is about 200uA. So the stand-by power is reduced and SMPS efficiency is improved. When the feedback voltage exceeds 0.3V, the FAN7554 normally operates by turning on Vref block. Figure 17-B . Delayed Shutdown & Feedback Waveform t Vfb Slope (dv/dt) = 5uA / Cfb 3V 6V Shutdown start point t2 t1 t Vfb Slope (dv/dt) = 5uA / Cfb 3V 6V Shutdown start point t2 t1 Figure 18. Gate Drive Circuit DRAIN FAN7554 OUT 7 6 Clock Shutdown Q DRAIN FAN7554 OUT 7 6 Clock Shutdown Q FAN7554 OUT 7 6 Clock Shutdown Q |
Similar Part No. - FAN7554 |
|
Similar Description - FAN7554 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |