Electronic Components Datasheet Search |
|
131-4353-00 Datasheet(PDF) 2 Page - Intersil Corporation |
|
131-4353-00 Datasheet(HTML) 2 Page - Intersil Corporation |
2 / 6 page Application Note 1636 2 AN1636.1 July 27, 2011 If the output voltage desired is -0.8V, then R3 is shorted. The value for R2 is typically between 1k and 10k. Note that if VOUT < |2.5V| (i.e., -0.8V), the switching frequency and compensation must be changed to accommodate the 300kHz operation, due to minimum on-time limitation. Please refer to the ISL85033 data sheet for further information. Frequency Control The ISL85033-12VEVAL3Z evaluation board has an FS pin that controls the frequency of operation. Programmable frequency allows for optimization between efficiency and external component size. Default switching frequency is 500kHz when FS is tied to VCC (R9 = 0). By removing R9 and connecting R10 to the most negative potential on the board (VOUT), the switching frequency could be changed from 300kHz (R10 = 383k) to 2MHz (R10 = 40.2k). See the ISL85033 data sheet for information about calculating the value of R10. Do not leave this pin floating. Disabling/Enabling Function The ISL85033-12VEVAL3Z evaluation board contains an S1 switch that enables or disables both channels, thus allowing a low quiescent current state. Table 2 details this function. NOTE: If driven externally, the EN signal (the same as all input logic signals) is referenced to VOUT (the most negative potential on the board) and not to GND. Therefore, the source cannot be GND referenced, and input level shifting is required. FIGURE 1. ISL85033-12VEVAL3Z BUCK BOOST: RECOMMENDED MAXIMUM IOUT (VIN) FIGURE 2. ISL85033-12VEVAL3Z EFFICIENCY: VOUT = -15V FIGURE 3. ISL85033-12VEVAL3Z EFFICIENCY: VOUT = -12V FIGURE 4. ISL85033-12VEVAL3Z EFFICIENCY: VOUT = -5V 0 1 2 3 4 5 6 5 7 9 11 13 15 17 19 21 23 25 VIN (V) VOUT = -5V VOUT = -12V VOUT = -15V 60 65 70 75 80 85 90 95 0 0.5 1.0 1.5 2.0 2.5 IOUT (A) VIN = 5V VIN = 12V 0 0.5 1.0 1.5 2.0 2.5 IOUT (A) VIN = 12V 60 65 70 75 80 85 90 95 VIN = 15V VIN = 5V 60 65 70 75 80 85 90 95 0 0.5 1.0 1.5 2.0 2.5 IOUT (A) VIN = 12V VIN = 15V VIN = 5V VIN = 6V TABLE 2. SWITCH SETTINGS S1 ON/OFF CONTROL ON Enable VOUT OFF Disable VOUT |
Similar Part No. - 131-4353-00 |
|
Similar Description - 131-4353-00 |
|
|
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 |