參數(shù)資料
型號: PCA5007H
廠商: NXP Semiconductors N.V.
英文描述: Pager baseband controller
中文描述: 傳呼機基帶控制器
文件頁數(shù): 59/112頁
文件大?。?/td> 604K
代理商: PCA5007H
1998 Oct 07
59
Philips Semiconductors
Product specification
Pager baseband controller
PCA5007
6.22.2
T
YPICAL OPERATING CHARACTERISTICS
The maximum power delivered by the DC/DC converter is
given by equation (1).
)
2
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 30 and 31 the
maximum available output current (I
L
) is shown as a
function of V
BAT
and R
s
.
P
o(max)
Bat
×
--V
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 32a 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.32b 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.33).
Fig.30 Maximum available output current (mA) in normal mode.
V
DD
= 2.2 V; R
S
= R
BAT
+ R
ind
+ R
sw
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
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