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| 型号： | EM4006F9CB2RC |
| 英文描述： | Single-Phase Buck PWM Controller with Integrated High Speed MOSFET Driver and Pre-Biased Load Capability; Temperature Range: 0°C to 70°C; Package: 28-QFN |
| 中文描述： | 模拟杂项 |
| 文件页数： | 4/8页 |
| 文件大小： | 120K |
| 代理商： | EM4006F9CB2RC |
EM4005
EM4105
Copyright
2002, EM Microelectronic-Marin SA
4
www.emmicroelectronic.com
Block Diagram
CLOCK
EXTRACTOR
FULL WAVE
RECTIFIER
DATA
MODULATOR
SEQUENCER
DATA
ENCODER
MEMORY
ARRAY
Logic
Clock
Serial
Data Out
Modulation
Control
Cress
COIL1
COIL2
AC1
AC2
+
-
Csup
VDD
VSS
Fig. 5
Functional Description
General
The EM4005 is supplied by means of an electromagnetic
field induced on the attached coil. The AC voltage is
rectified in order to provide a DC internal supply voltage.
When the DC voltage is sufficient the chip sends data
continuously. When the last bit is sent, the chip will
continue with the first bit until the power goes off.
Full Wave Rectifier
The AC input induced in the external coil by an incident
magnetic field is rectified by a Graetz bridge. The bridge
will limit the internal DC voltage to avoid malfunction in
strong fields.
Clock extractor
One of the coil terminals (COIL1) is used to generate the
master clock for the logic function. The output of the clock
extractor drives a sequencer.
Sequencer
The sequencer provides all necessary signals to address
the memory array and to encode the serial data out. The
data rate is set to 32 clocks per bit.
Data Encoder
The data is coded according to the FDX-B scheme. At the
beginning of each bit, a transition will occur. A logic bit "1"
will keep its state for the whole bit duration and a logic bit
"0" will show a transition in the middle of the bit duration
(refer to fig. 4).
The FDX-B allows an advance of up to 8 clocks in the ON
to OFF transition. Due to its low power consumption, there
is no difference in performance for the H4005 when
implementing a transition advance. No clock advance is
provided on the standard version.
Data Modulator
The data modulator is controlled by the signal Modulation
Control in order to induce a high current on COIL2
terminal when this signal is at logic "0". This will affect the
magnetic field according to the data stored in the memory
array.
Memory
The memory contains 128 bits laser programmed during
manufacturing according to a customer list of codes. The
bits are read serially in order to control the modulator. The
128 bits output sequence is repeated continuously until
power goes off.
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