 |
Zakładka z wyszukiwarką danych komponentów |
|
|
Zakładka z wyszukiwarką danych komponentów |
|
LTM4633 Arkusz danych(PDF) 14 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTM4633 Arkusz danych(HTML) 14 Page - Linear Technology |
|
|
14 / 32 page  LTM4633 14 4633f For more information www.linear.com/LTM4633 applicaTions inForMaTion VTRACK is the track ramp applied to the slave’s track pin. VTRACK has a control range of 0V to 0.8V, or the internal reference voltage. When the master’s output is divided down with the same resistor values used to set the slave’s output, then the slave will coincident track with the master until it reaches its final value. The master will continue to its final value from the slave’s regulation point. Voltage tracking is disabled when VTRACK is more than 0.8V. RTA in Figure 2 will be equal to the RFB2 for coincident tracking. The TK/SS pin of the master can be controlled by a capaci- tor placed on the master regulator TK/SS pin to ground. A 1.5µA current source will charge the TK/SS pin up to the reference voltage and then proceed up to INTVCC. After the 0.8V ramp, the TK/SS pin will no longer be in control, and the internal voltage reference will control output regula- tion from the feedback divider. Foldback current limit is disabled during this sequence of turn-on during tracking or soft-starting. The TK/SS pins are pulled low when the RUN pin is below 1.3V or INTVCC drops below 3.5V. The total soft-start time can be calculated as: tSS = 0.8V •CSS 1.5µA Regardless of the mode selected by the MODE/PLLIN pin, the regulator channels will always start in pulse-skipping mode up to TK/SS = 0.64V. Between TK/SS = 0.64V and 0.74V, it will operate in forced continuous mode and revert totheselectedmodeonceTK/SS>0.74V.Theoutputripple is minimized during the 100mV forced continuous mode window ensuring a clean PGOOD signal. When the channel is configured to track another supply, the feedback voltage of the other supply is duplicated by a resistor divider and applied to the TK/SS pin. Therefore, the voltage ramp rate on this pin is determined by the ramp rate of the other supply’s voltage. Note that the small soft- RFB3 19.1k RFB2 121k RFB1 69.8k COUT3 470µF COUT6 470µF COUT8 100µF COUT2 100µF 220pF 1.5V VFB1 VFB1 VFB2 1.2V 3.3V COUT5 100µF 220pF VFB3 100pF COUT1 100µF CSS3 0.1µF VOUT3 VOUT3 RTA 121k SOFT-START MASTER RAMP SET BY CSS1 OR EXTERNAL RAMP UVLO SET AT 6V ON RUN PINS. RUN PINS CAN BE SEQUENCED OR ENABLED FROM LOGIC CONTROL MASTER OUTPUT RAMP FED TO SLAVE COUT, SEE TABLE 5 RTB 60.4k 13.3k 60.4k 69.8k CIN1 22µF 16V CIN2 22µF 16V CIN3 22µF 16V CIN4 22µF 16V COUT4 100µF COUT7 100µF 10k 10k CNTL_PWR MODE/PLLIN RUN1 RUN2 RUN3 TK/SS2 TK/SS3 FREQ/PLLLPF COMP1 COMP2 COMP3 PGOOD12 PGOOD3 TEMP1 TEMP2 VOUT1 VFB1 VOUT2 VFB2 VOUT3 VFB3 4633 F02 GND SGND VIN1 SW1 VIN2 4.7V TO 16V SW2 VIN3 LTM4633 SW3 4.7µF 6.3V INTVCC EXTVCC TK/SS1 VFB2 VFB3 Figure 2. Triple Outputs, 1.5V and 1.2V Tracking to 3.3V |
Podobny numer części - LTM4633 |
|
Podobny opis - LTM4633 |
|
|
Link URL |
| Polityka prywatności |
| ALLDATASHEET.PL |
| Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów 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 |
Polish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
