參數(shù)資料
型號: PCA5010
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機(jī)基帶控制器
文件頁數(shù): 63/112頁
文件大?。?/td> 627K
代理商: PCA5010
1998 Nov 02
63
Philips Semiconductors
Product specification
Pager baseband controller
PCA5010
6.22.2
T
YPICAL OPERATING CHARACTERISTICS
The maximum power delivered by the DC/DC converter is
given by equation (1).
V
4 R
s
(1)
R
s
is the total series resistance which is the sum of
R
BAT
+ R
ind
+ R
sw
+ ESR(C
o
). In Figs 37 and 38 the
maximum available output current I
L
is shown as a function
of V
BAT
and R
s
.
P
o(max)
)
-------------------
2
The efficiency is determined by the series resistance R
S
and the current consumption of the converter itself. R
S
is
the sum of the battery resistance R
BAT
, the DC resistance
SRL of the coil, the on resistance of the MOSFET R
DS,on
and the ESR of the output capacitor C
o
. Figure 39a shows
the efficiency when using a 470
μ
H coil with a SRL of 5
and a load capacitor of 4.7
μ
F with an ESR of 0.5
. In
Fig.39b the efficiency for the same configuration is shown
but with a SRL of only 0.1
. To increase efficiency for
extremely low output currents, the converter should be set
into standby mode (see Fig.40).
Fig.37 Maximum available output current (mA) in normal mode.
handbook, full pagewidth
MGR345
0.8
1
1.2
1.6
8
4
2
6
5
3
7
1.4
VBAT (V)
Rs
(
)
1
2
2
25
25
30
30
30
35
35
35
40
40
40
45
45
50
50
55
55
60
60
65
70
70
75
75
80
90
100
V
DD
= 2.2 V; R
S
= R
BAT
+ R
ind
+ R
sw
.
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