数据搜索系统，热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

预览 PDF HTML

PM6652 数据表(PDF) 26 Page - STMicroelectronics

部件名 PM6652
功能描述  Single-phase controller for Intel MVP 6.5 render voltage regulator,
PDF  53 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6652 数据表(HTML) 26 Page - STMicroelectronics

Back Button PM6652 Datasheet HTML 22Page - STMicroelectronics PM6652 Datasheet HTML 23Page - STMicroelectronics PM6652 Datasheet HTML 24Page - STMicroelectronics PM6652 Datasheet HTML 25Page - STMicroelectronics PM6652 Datasheet HTML 26Page - STMicroelectronics PM6652 Datasheet HTML 27Page - STMicroelectronics PM6652 Datasheet HTML 28Page - STMicroelectronics PM6652 Datasheet HTML 29Page - STMicroelectronics PM6652 Datasheet HTML 30Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 26 / 53 page
background image
Device description
PM6652
26/53
Doc ID 16867 Rev 5
Equation 1
where KOSC is a constant value (140 ns typ.) and τ is the internal propagation delay (40 ns
typ.).
This leads to a nearly constant switching frequency, regardless of input and output voltages.
When the output voltage goes lower than the internal programmed voltage (see
Section 8.5:
Droop function for details), the on-time one-shot generator directly drives the high-side
MOSFET for a fixed on-time, allowing the inductor current to increase; after the on-time, an
off-time phase, in which the low-side MOSFET is turned on, follows.
If the DPRSLPVR control pin is set low, the low-side MOSFET is turned off only when the
output voltage becomes lower than the programmed value again, and a new cycle begins. In
this working mode the switching frequency is almost load independent, as shown below.
Refer to
Section 8.4: Differential remote sensing section for details about the light load, high-
efficiency algorithm.
The duty cycle of the buck converter, in steady-state conditions, is given by:
Equation 2
The switching frequency is therefore calculated as:
Equation 3
where:
Equation 4
can be set by varying the external resistor ROSC, placed between the VIN and VOSC pin.
RINT is the integrated switching frequency programming resistor (typ. 17 kΩ).
The resulting switching frequency is theoretically independent from battery and output
voltage; actually the conduction losses due to MOSFET ON-resistance, inductor DCR and
PCB traces can slightly influence the programmed value.
τ
+
=
OSC
OUT
OSC
ON
V
V
K
T
IN
OUT
V
V
D
=
OSC
OSC
OSC
OUT
OSC
IN
OUT
ON
SW
K
1
V
V
K
V
V
T
D
f
⋅
α
≅
τ
+
=
=
OSC
INT
INT
IN
OSC
OSC
R
R
R
V
V
+
=
=
α



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53


数据表 下载

Go To PDF Page


链接网址



ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   数据表链接    |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
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