參數(shù)資料
型號(hào)： MC33394
廠商： 飛思卡爾半導(dǎo)體(中國)有限公司
元件分類： CAN
英文描述： Switch Mode Power Supply with Multiple Linear Regulators and High Speed CAN Transceiver(帶有多個(gè)線性穩(wěn)壓器和高速CAN收發(fā)器的開關(guān)方式電源)
中文描述： 開關(guān)電源的多線性穩(wěn)壓器和高速CAN收發(fā)器（帶有多個(gè)線性穩(wěn)壓器和高速的CAN收發(fā)器的開關(guān)方式電源）
文件頁數(shù)： 28/44頁
文件大小： 641K
代理商： MC33394
28
Go to: www.freescale.com
Where Io is the average output current.
The inductor peak current is given by the following
equation:
IpkL
Io
Vo
Vin
1
2
IL
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
IL
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
The following example shows a procedure for determining
the component values. The VPRE output is set to regulate to
IL
VRL
Vfwd1
D1
L
Vin
RLOAD
VO
+
–
+
CO
RL
Q2
VRDS(on)
RDS(on)
IQ
Q1
ESR
D2
Vfwd2
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:
(Vin
Vo
Vfwd2)
L
IL
Vo
Vfwd2
f
Vin
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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