поискавой системы для электроныых деталей |
|
ISL6123 датащи(PDF) 11 Page - Intersil Corporation |
|
ISL6123 датащи(HTML) 11 Page - Intersil Corporation |
11 / 23 page ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128, ISL6130 11 FN9005.11 August 25, 2011 Using the ISL6123EVAL1Z Platform The ISL6123EVAL1Z platform layout illustrates the small implementation size for a typical 4-rail sequencing application. The platform allows evaluation of the ISL6123, ISL6124, ISL6126, ISL6127, ISL6128 and ISL6130. See Figure 17 for schematic and photograph of evaluation platform and Table 2 for the component listing. Significant current loading of the GATE or capacitive loading of the DLY_ON and OFF pins will affect functionality and performance. The default configuration of the ISL6123EVAL1Z circuit is built around the following design assumptions: 1. Using the ISL6123IR. 2. The four supplies being sequenced are 5V (IN_A), 3.3V (IN_B), 2.5V (IN_D) and 1.5V (IN_C). The UVLO levels are ~80% of nominal voltages. Resistors are chosen such that the total resistance of each divider is ~ 10k. Using standard value resistors to approximate 80% of nominal voltage supply = 0.63V on UVLO input. 3. The desired order turn-on sequence is 5V first, then 3.3V about 12ms later, then the 2.5V supply about 19ms later, and lastly, the 1.5V supply about 40ms later. 4. The desired turn-off sequence is first both 1.5V and 3.3V supplies at the same time, then the 2.5V supply about 50ms later, and lastly, the 5V supply about 72ms after that. LED off indicates sequence has completed and RESET has released and pulled high. The board is shipped with the ISL6123 installed and with each of the other released variant types loose packed. As this sequencer family has a common function pinout for most variants, no major modifications to the board are necessary to evaluate the other ICs. See Figure 18 for the ISL6125-specific evaluation board and schematic. All scope shots are taken from the ISL6123EVAL1Z board. Figures 9 and 10 illustrate the desired turn-on and turn-off sequences, respectively. The sequencing order and delay between voltages sequencing is set by external capacitance values; sequences other than those illustrated can be accomplished. Figures 11 and 12 illustrate the timing relationships between the EN input; the RESET, DLY and GATE outputs; and the VOUT voltage for a single channel being turned on and off, respectively. RESET is not shown in Figure 11 as it asserts 160ms after the last GATE goes high. All IC family variants share a similar function for DLY_X capacitor charging and GATE and RESET operation. Figures 13 through 16 illustrate the principal feature and functional differences for each of the ISL6125, ISL6126, ISL6127 and ISL6128 variants. Figure 13 shows the ISL6125 open-drain outputs being sequenced on and off, along with the RESET relationship, which is similar to all other family variants. Figure 14 illustrates the independent input feature of the ISL6126 which, once EN is low, allows for each UVLO to be individually satisfied and for its associated GATE to turn on. Only when the last variable VIN is satisfied, as shown, does RESET release, to signal all input voltages are valid. Figure 15 shows the ISL6127 pre-programmed ABCD turn-on and DCBA turn-off order of sequencing, with minimal non-adjustable delay between each. Figure 16 demonstrates the independence of the ISL6128, the redundant 2-rail sequencer. It shows that either one of the two groups can be turned off, and the ABCD order of restart with capacitor programmable delay, once both EN inputs are pulled low. FIGURE 8. SYSRST LOW TO OUTPUT LATCH-OFF Typical Performance Curves (Continued) 1µs/DIV 5VOUT GATE SYSRST 2V/DIV 3.3VOUT |
Аналогичный номер детали - ISL6123 |
|
Аналогичное описание - ISL6123 |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |