Electronic Components Datasheet Search |
|
NCV8800SDW26R2 Datasheet(PDF) 10 Page - ON Semiconductor |
|
NCV8800SDW26R2 Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 12 page NCV8800 Series http://onsemi.com 10 The major advantage of constant frequency operation is that the component selections, especially the magnetic component design, become very easy. Oscillator frequency is fixed at 200 kHz. Start−Up After the NCV8800 is powered up, the error amplifier will begin linearly charging the COMP pin capacitor. The COMP capacitance and the source current of the error amplifier determine the slew rate of COMP voltage. The output of the error amplifier is connected internally to the inverting input of the PWM comparator and it is compared with the divided down output voltage FB1/FB2 at the non−inverting input of the PWM comparator. At the beginning of each switching cycle, the oscillator output will set the PWM latch. This causes the high−side switch to turn on and the regulator output voltage to ramp up. When the divided down output voltage achieves a level set by the COMP voltage, the high−side switch will be turned off. The V2 control loop will adjust the high−side switch duty cycle as required to ensure the regulator output voltage tracks the COMP voltage. Since the COMP voltage increases gradually, Soft Start can be achieved. Overcurrent Protection The output switch is protected on both the high side and low side. Current limit is set at 1.0 A (min). Figure 9. 16 Lead SOW (4 Leads Fused), qJA as a Function of the Pad Copper Area (2 oz. Cu. Thickness), Board Material = 0.0625 , G−10/R−4 40 70 90 100 0 Copper Area (inch2) 0.5 1.0 1.5 2.0 3.0 80 60 50 2.5 Heat Sinks A heat sink effectively increases the surface area of the package to improve the flow of heat away from the IC and into the surrounding air. Each material in the heat flow path between the IC and the outside environment will have a thermal resistance. Like series electrical resistances, these resistances are summed to determine the value of RqJA: R qJA + RqJC ) RqCS ) RqSA (3) where: RqJC = the junction−to−case thermal resistance, RqCS = the case−to−heatsink thermal resistance, and RqSA = the heatsink−to−ambient thermal resistance. RqJC appears in the package section of the data sheet. Like RqJA, it too is a function of package type. RqCS and RqSA are functions of the package type, heatsink and the interface between them. These values appear in heat sink data sheets of heat sink manufacturers. |
Similar Part No. - NCV8800SDW26R2 |
|
Similar Description - NCV8800SDW26R2 |
|
|
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 |