- 您現在的位置：買賣IC網 > PDF目錄15796 > KIT33394DWBEVB (Freescale Semiconductor)KIT EVAL FOR MC33394 8X PWR SPLY PDF資料下載
參數資料
| 型號： | KIT33394DWBEVB |
| 廠商： | Freescale Semiconductor |
| 文件頁數： | 21/44頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVAL FOR MC33394 8X PWR SPLY |
| 標準包裝： | 1 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁當前第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁
33394
28
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
Where Io is the average output current.
The inductor peak current is given by the following
equation:
IpkL + Io
Vo
Vin
) 1
2
DIL
Figure 14. Basic Boost Converter Operation and its Waveforms
IL
ID
IQ
Q
L
Vin
RLOAD
VO
+
–
+
CO
D
Vin
RLOAD
+
–
+
CO
L
POWER SWITCH ON
ILOAD
Vout
VIN
RLOAD
+
–
+
CO
POWER SWITCH OFF
IOFF
Vout
IL
IO
IL
ID
IQ
VQ
VCo
DIL
ton
toff
T
ION
ILOAD
t
5.2.1. Switching Regulator Component Selection
The selection of the external inductor L2 and capacitor C2
values (see Figure 15) is a compromise between the two
modes of operation of the switching regulator, the pre
regulated voltage VPRE and the dropout voltage of the linear
regulators. Ideal equations describing the peak—peak
inductor current ripple, peak—peak output voltage ripple and
peak inductor current are shown below. Since the switching
regulator will work mostly in the buck mode, the inductor and
the switcher input and output capacitor were selected for
optimum buck controller performance, but also taking into
account the restriction placed by adopting the boost
converter as well.
Figure 15. 33394 Switcher Topology
IL
VRL
Vfwd1
D1
L
Vin
RLOAD
VO
+
–
+
CO
RL
Q2
VRDS(on)
RDS(on)
IQ
Q1
ESR
D2
Vfwd2
The following example shows a procedure for determining
the component values. The VPRE output is set to regulate to
5.6 V and the linear regulators require a minimum of 0.4 V
dropout voltage. This leaves a
±0.2 V window for the
peak—to–peak output voltage ripple. Assuming the following
conditions:
Vin(typ) = 13.5 V
Io = 1.2
VPRE = 5.6 V (+6 V in the boost mode)
f = 200 kHz
Vfwd1 = Vfwd2 = 0.5 V
Maximum allowed output voltage ripple in the buck mode
Vpp(max) = 0.2 V/2 = 0.1 V (to allow for process and
temperature variations).
5.2.1.1. Selecting the Inductor
In order to select the proper inductance value, the inductor
ripple current
IL has to be determined. The usual ratio of IL
to output current Io is:
IL = 0.3 Io
As described in the previous section, and taking into
account the 33394 switcher topology (see Figure 15), the
inductor ripple current can be estimated as:
DIL +
(Vin * Vo * Vfwd2)
L
Vo ) Vfwd2
Vin
f
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相關PDF資料 |
PDF描述 |
|---|---|
| 1589065-4 | CIRCULAR |
| 1589059-4 | CIRCULAR |
| GEC35DRYI-S734 | CONN EDGECARD 70POS DIP .100 SLD |
| RP20-2412SFW/N-HC | CONV DC/DC 20W 9-36VIN 12VOUT |
| MAX6439UTKSRD3+T | IC BATTERY MON SNGL SOT23-6 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| KIT33660EFEVBE | 功能描述:界面開發(fā)工具 ISO K LINE SERIAL LINK I RoHS:否 制造商:Bourns 產品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| KIT33661DEVB | 功能描述:網絡開發(fā)工具 ELIN TRANSCEIVER RoHS:否 制造商:Rabbit Semiconductor 產品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數據速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
| KIT33662JEFEVBE | 功能描述:界面開發(fā)工具 LIN 2.1 / SAEJ2602-2 RoHS:否 制造商:Bourns 產品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| KIT33662LEFEVBE | 功能描述:界面開發(fā)工具 LIN 2.1 / SAEJ2602-2 RoHS:否 制造商:Bourns 產品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| KIT33689DWBEVB | 功能描述:網絡開發(fā)工具 SBC W/ ELIN TRANSCEIVER RoHS:否 制造商:Rabbit Semiconductor 產品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數據速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V |
發(fā)布緊急采購，3分鐘左右您將得到回復。