參數(shù)資料
型號(hào)： MAX253
廠商： Maxim Integrated Products, Inc.
英文描述： Transformer Driver for Isolated RS-485 Interface
中文描述： 變壓器驅(qū)動(dòng)器，用于隔離型RS-485接口
文件頁(yè)數(shù)： 5/16頁(yè)
文件大?。?/td> 230K
代理商： MAX253
M
Transformer Driver for
Isolated RS -485 Interfac e
_______________________________________________________________________________________
5
_____________________Pin Desc ription
Not internally connected.
N.C.
5
+5V supply voltage.
Ground. Connect both GND1 and GND2
to ground.
V
CC
6
GND2
7
Open drain of N-channel transformer drive 2.
D2
8
SD
4
FS
3
PIN
GND1
2
Open drain of N-channel transfomer drive 1.
Ground. Connect both GND1 and GND2
to ground.
Frequency switch. If FS = V
CC
or open,
switch frequency = 350kHz; if FS = 0V,
switch frequency = 200kHz.
Shutdown. Ground for normal operation,
tie high for shutdown.
D1
1
FUNCTION
NAME
_______________Detailed Desc ription
The MAX253 is an isolated power-supply transformer
driver specifically designed to form the heart of a fully
isolated RS-485 data interface. Completely isolated
communications are obtained by combining the
MAX253 with a linear regulator, a center-tapped trans-
former, optocouplers, and the appropriate Maxim inter-
face product (as described in the Isolated RS-485/RS-
232 Data Interface section).
The MAX253 consists of an RC oscillator followed by a
toggle flip-flop, which generates two 50% duty-cycle
square waves, out-of-phase at half the oscillator fre-
quency (see Figure 2). These two signals drive the
ground-referenced output switches. Internal delays
ensure break-before-make action between the two
switches.
Ground SD for normal operation. When high, SD dis-
ables all internal circuitry, including the oscillator and
both power switches.
Pulling FS low reduces the oscillator frequency and low-
ers the supply current (see Supply Current vs.
Temperature in the Typical Operating Characteristics).
FS includes a weak pull-up, so it will float to the high-fre-
quency state if not connected.
MAX253
D1
D2
FS
GND1
GND2
V
CC
1
8
4
6
2
7
3
SD
FREQUENCY
SWITCH
ON / OFF
R2
50
R1
50
V
IN
5V
C1
0.1μF
Figure 1. Test Circuit
MAX253
D1
D2
FS
GND2
GND1
V
CC
FREQUENCY
SWITCH
C3
C1
C2
5V @ 200mA
ISOOUTPUT
5V
N
N
Q
Q
OSC
F / F
V
IN
SD
ON / OFF
400kHz/
700kHz
T
ISO
GND
Figure 2. Block Diagram
相關(guān)PDF資料
PDF描述
MAX253EUA Transformer Driver for Isolated RS-485 Interface
MAX253CPA Transformer Driver for Isolated RS-485 Interface
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MAX253EPA Transformer Driver for Isolated RS-485 Interface
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