Electronic Components Datasheet Search |
|
QPO-1L Datasheet(PDF) 5 Page - Vicor Corporation |
|
QPO-1L Datasheet(HTML) 5 Page - Vicor Corporation |
5 / 8 page Set your site on PICOR at www.picorpower.com PRELIMINARY Vicor Corp. Tel: 800-735-6200, 978-470-2900 Fax: 978-475-6715 QPO-1 Data Sheet Page 5 of 8 The slope adjust feature can be set to zero providing relative constant headroom versus load using an RSA of 100kΩ. The user can optimize performance based on the expected variation in load current and the desired power dissipation range. The formula below should be used to calculate the RSA value for the desired headroom versus current slope. If the peak detector is enabled, the peak of the ripple will be added back to the headroom at a given load condition. RSA = ((∆I*0.05)/∆V) *2500 Example: For a 5A maximum load and a 150mV reduction in headroom. RSA =((5A*0.05/0.15V)*2500Ω = 4.167kΩ Peak Detector Function This feature dynamically adds to the headroom voltage to accommodate converter ripple variation. This feature can be enabled by connecting the PEAKIN pin to the QPOIN pin and disabled by putting a small RC filter at the PEAKIN pin as shown in Figure 8. The active loop performance has been optimized for 45 degrees of phase margin over the expected load range. CCO shown in Figs 1 and 2 must be a low ESR ceramic capacitor. Loading the QPO-1 directly with low ESR ceramic capacitance will affect the phase margin and is not recommended. The distributed load capacitance and inductance of the load path will vary depending on the application. The effects of a distributed load impedance on phase margin when very low ESR load capacitance is present will typically be mitigated by the distributed inductance of the load path. The transient load response in Figure 4 was measured with approximately 10nH of distributed inductance between QPO-1 output and the load board which had a 15µF low ESR ceramic capacitor across the static load resistance. The following is a summary of the optional configurations that a user can select for the QPO-1. • No slope adjust, no peak detect: fixed headroom over ripple amplitude and current. • Same as above, but with peak detect enabled: peak of ripple amplitude is added to the headroom voltage optimizing headroom with varying ripple amplitude. • No peak detection with slope adjust: to improve transient load range and efficiency trading off attenuation at high current. • Using both peak detection and slope adjust: to accommodate ripple amplitude variation with increased transient capability and efficiency. Module + OUT QPOIN PEAKIN 1k 0.1 µF Figure 8 – Peak detector Disable Circuit QPO-1 Attenuation vs. Power Iload=10A 1% Rhr std. values for VOUT=3.3V 15V 28V Rss=100k (delta Vhr = 0mV from 0.1 to 10A) 3.3V 15V 28V 69.8k 324k 602k 47.5k 215k 402k 39.2k 178k 332k 30.1k 137k 255k 24.9k 113k 210k 21k 95.3k 178k -60 -50 -40 -30 -20 -10 0 1234 Watts dB 500kHz 50Hz Figure 9 – Power vs Attenuation without slope QPO-1 Attenuation vs. Power Iload=10A 1% Rhr std. values for VOUT=3.3V 15V 28V Rss=7.1k (delta Vhr =150mV from 0.1 to 10A) 14.3k 64.9k 121k 16.5k 75k 140k 18.2k 82.5k 154k 21k 95.3k 178k 22.6k 102k 191k 24.9k 113k 210k 3.3V 15V 28V 27.4k 124k 232k -60 -50 -40 -30 -20 -10 0 12 34 Watt dB 500kHz 50Hz Figure 10 – Power vs Attenuation with slope adjust |
Similar Part No. - QPO-1L |
|
Similar Description - QPO-1L |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |