max253cuat Maxim Integrated Products, Inc., max253cuat Datasheet - Page 4

• Manufacturer Part Number: max253cuat
• Description: Max253 Transformer Driver For Isolated Rs-485 Interface
• Manufacturer: Maxim Integrated Products, Inc.

Transformer Driver for
Isolated RS-485 Interface
(Circuit of Figure 6, V
4
____________________________Typical Operating Characteristics (continued)
100
_______________________________________________________________________________________
90
80
70
60
50
40
30
20
10
0
0
CIRCUIT OF FIGURE 1
20
EFFICIENCY vs. LOAD CURRENT
40
LOAD CURRENT (mA)
60
V
IN
(FS = HIGH)
= 4.5V
80
IN
SWITCHING WAVEFORMS
100
= 5V ±10%, T
120
(TWO CYCLES)
140
V
160
IN
= 5.5V
180
A
200
= +25°C, unless otherwise noted.)
CIRCUIT OF FIGURE 6
10
TIME FROM SHUTDOWN TO POWER-UP
9
8
7
6
5
4
3
2
1
0
0
OUTPUT VOLTAGE vs. LOAD CURRENT
CIRCUIT OF FIGURE 7
V
TURNS RATIO = 1:2.1
CIRCUIT OF FIGURE 6
V
TURNS RATIO = 1:1
20
IN
IN
D2
D1
= 3.3V
= 5.0V
40
60
LOAD CURRENT (mA)
80
(FS = LOW)
100
120
CIRCUIT OF FIGURE 6
V
TURNS RATIO = 1:1.3
MEASURED AT TP1
IN
140
= 5.0V
160 180 200
CIRCUIT OF FIGURE 1
220
SD
TP1 (OUTPUT VOLTAGE)
SWITCHING WAVEFORMS
(BREAK BEFORE MAKE)
10
9
8
7
6
5
4
3
2
1
0
0
OUTPUT VOLTAGE vs. LOAD CURRENT
CIRCUIT OF FIGURE 7
V
TURNS RATIO = 1:2.1
CIRCUIT OF FIGURE 6
V
TURNS RATIO = 1:1
20
IN
IN
= 3.3V
= 5.0V
40
60
LOAD CURRENT (mA)
80
(FS = HIGH)
100
120
CIRCUIT OF FIGURE 6
V
TURNS RATIO = 1:1.3
MEASURED AT TP1
IN
140
= 5.0V
160 180 200
D2
D1
220