Datasheet MAX253 (Maxim) - 4

MAX253 Transformer Driver for Isolated RS-485 Interface
Typical Operating Characteristics (continued)
Circuit of Figure 6, VIN = 5V ±10%, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT (FS = HIGH) (FS = LOW) (FS = HIGH)
100 10 10 plot09 plot10 CIRCUIT OF FIGURE 7 plot11 CIRCUIT OF FIGURE 7 90 9 V 9 IN = 3.3V VIN = 3.3V 80 VIN = 5.5V 8 TURNS RATIO = 1:2.1 8 TURNS RATIO = 1:2.1 CIRCUIT OF FIGURE 6 70 7 7 CIRCUIT OF FIGURE 6 VIN = 4.5V VIN = 5.0V VIN = 5.0V 60 6 TURNS RATIO = 1:1.3 6 TURNS RATIO = 1:1.3 50 5 5 40 4 4 EFFICIENCY (%) OUTPUT VOLTAGE (V) 30 3 CIRCUIT OF FIGURE 6 OUTPUT VOLTAGE (V) 3 CIRCUIT OF FIGURE 6 VIN = 5.0V VIN = 5.0V 20 2 TURNS RATIO = 1:1 2 TURNS RATIO = 1:1 10 1 MEASURED AT TP1 1 MEASURED AT TP1 0 0 0 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 220 0 20 40 60 80 100 120 140 160 180 200 220 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)
SWITCHING WAVEFORMS SWITCHING WAVEFORMS (TWO CYCLES) (BREAK BEFORE MAKE)
D1 D1 D2 D2 CIRCUIT OF FIGURE 1 CIRCUIT OF FIGURE 1
TIME FROM SHUTDOWN TO POWER-UP
SD TP1 (OUTPUT VOLTAGE) CIRCUIT OF FIGURE 6 www.maximintegrated.com Maxim Integrated | 4