MAX256_05 Datasheet, PDF (4/14 Pages) Maxim Integrated Products – 3W Primary-Side Transformer H-Bridge Driver for Isolated Supplies

3W Primary-Side Transformer H-Bridge Driver
for Isolated Supplies
Typical Operating Characteristics
(V_CC = +5.0V ±10%, T_A = +25°C, unless otherwise noted.) (See Figure 8A)
SUPPLY CURRENT vs.
OSCILLATOR FREQUENCY
7
6
5
4
3
2
1
0
100 200 300 400 500 600 700 800 900 1000
OSCILLATOR FREQUENCY (kHz)
OSCILLATOR FREQUENCY vs. R_S (+1%)
1400
1200
1000
800
MAX
600
400
TYP
200
MIN
0
10
100
1000
R_S (kΩ)
R_S vs. REQUIRED ET PRODUCT
1000
+3.6V MAX SUPPLY
100
+5.5V MAX SUPPLY
10
1
10
100
REQUIRED ET PRODUCT (Vµs)
OUTPUT VOLTAGE vs. OUTPUT CURRENT
(TYPICAL APPLICATION FIGURE 8A)
12
10
8
5.0V
5.5V
6
4
4.5V
2
0
0
200
400
600
800
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(TYPICAL APPLICATION FIGURE 8A)
1.0
0.9
5.5V
0.8
0.7
0.6
4.5V
5.0V
0.5
0.4
0.3
0.2
0.1
0
0
200
400
600
800
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE vs. OUTPUT CURRENT
(TYPICAL APPLICATION FIGURE 8B)
12
10
8
3.6V
6
4
3.0V
3.3V
2
0
0
100 200 300 400 500
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(CIRCUIT OF FIGURE 8B)
1.0
0.9
3.6V
0.8
3.3V
0.7
0.6
3.0V
0.5
0.4
0.3
0.2
0.1
0
0
100 200 300 400 500
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE vs. OUTPUT CURRENT
(CIRCUIT OF FIGURE 8C)
40
35
30
25
4.5V
5.0V
5.5V
20
15
10
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
(CIRCUIT OF FIGURE 8C)
1.0
0.9
5.5V
0.8
0.7
4.5V _5.0V
0.6
0.5
0.4
0.3
0.2
0.1
0
0 20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
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