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参数资料
| 型号： | EM4095HMSO16A |
| 元件分类： | 线性稳压 |
| 英文描述： | Single 12V Input Supply Dual Regulator - Synchronous Rectified Buck PWM and Linear Power Controller; Temperature Range: 0°C to 70°C; Package: 14-SOIC |
| 中文描述： | 电信提供商/数据通信 |
| 文件页数： | 2/10页 |
| 文件大小： | 204K |
| 代理商： | EM4095HMSO16A |
EM4095
Copyright
2002, EM Microelectronic-Marin SA
10
www.emmicroelectronic.com
Appendix
Equations
Antenna resonant frequency f0:
f
LC
A
0
1
2
=
π
(1)
Where C0 is resonant capacitor composed of CRES, CDV1
and CDV2:
CC
RES
DV
0
12
=+
+
(2)
Usually antenna coil is specified by its inductance (LA) and
Q factor (QA). Serial resistance of antenna is defined by
following equation:
R
fL
Q
ANT
A
=
2
0
π
(3)
The equations which follow are valid for bridge
configuration as defined on Figures 1, 2 and 3. For figures
1 and 2 RSER has to be considered 0.
The AC current amplitude at resonant frequency is
defined as follows:
I
VV
RR
R
ANT
dd
ss
ANT
SER
AD
=
++
4
2
π
(4)
RMS antenna current (important for power dissipation
calculation):
I
RMS
ANT
=
2
(5)
Peak to peak voltage on antenna is defined by following
equation:
0
0C
f
I
V
ANT
ANTpp
π
=
(6)
To ensure correct operation of the AM demodulation
chain, the AC peak to peak voltage on DEMOD_IN pin
(VDMOD_INpp) has to be inside common mode range. Once
peak to peak voltage on antenna is known the capacitor
divider division factor can be calculated:
2
1
_
DV
ANTpp
INpp
DMOD
C
V
+
=
(7)
Power dissipation is composed of power dissipated on
ANT drivers and internal power consumption:
()
PI
R
I
V
RMS
AD
DDon
DD
SS
=
+
2
(7)
Temperature increase of die due to power dissipation is:
Th
R
P
T
=
(8)
Where RTh is Package thermal resistor.
EM Microelectronic-Marin SA, 07/02, Rev. /490
EM Microelectronic-Marin SA cannot assume responsibility for use of any circuitry described other than circuitry
entirely embodied in an EM Microelectronic-Marin SA product. EM Microelectronic-Marin SA reserves the right to
change the circuitry and specifications without notice at any time. You are strongly urged to ensure that the
information given has not been superseded by a more up-to-date version.
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