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ISL8112
Typical Performance Curves
Circuit of Figure 17 and Figure 18, no load on LDO, VSEN1, VSEN2, VREF2, and VREF1,
V IN = 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V, VEN_LDO = 5V, T A = -40°C to +100°C,
unless otherwise noted. Typical values are at T A = +25°C. (Continued)
1.0
7 V IN SKIP MODE
7 V IN PWM MODE
7 V IN ULTRA SKIP MODE
12 V IN SKIP MODE
12 V IN PWM MODE
12 V IN ULTRA SKIP MODE
25 V IN SKIP MODE
25 V IN PWM MODE
25 V IN ULTRA SKIP MODE
1.0
7 V IN SKIP MODE
7 V IN PWM MODE
7 V IN ULTRA SKIP MODE
12 V IN SKIP MODE
12 V IN PWM MODE
12 V IN ULTRA SKIP MODE
25 V IN SKIP MODE
25 V IN PWM MODE
25 V IN ULTRA SKIP MODE
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.001
0.010
0.100
1.000
10.000
0
0.001
0.010
0.100
1.000
10.000
OUTPUT LOAD (A)
FIGURE 3. V OUT2 = 3.3V EFFICIENCY vs LOAD (500kHz)
300
250
200
PWM
OUTPUT LOAD (A)
FIGURE 4. V OUT1 = 5V EFFICIENCY vs LOAD (400kHz)
50
45
40
35
30
150
100
ULTRA-SKIP
25
20
15
PWM
ULTRA-SKIP
50
10
0
0.001
0.010
0.100
SKIP
1.000
10.000
5
0
0.001
0.010
0.100
SKIP
1.000
10.000
250
OUTPUT LOAD (A)
FIGURE 5. V OUT2 = 1.05V FREQUENCY vs LOAD
PWM
50
45
OUTPUT LOAD (A)
FIGURE 6. V OUT2 = 1.05V RIPPLE vs LOAD
200
150
40
35
30
25
PWM
100
ULTRA-SKIP
20 ULTRA-SKIP
15
SKIP
50
SKIP
10
5
0
0.001
0.010
0.100
1.000
10.000
0
0.001
0.010
0.100
1.000
10.000
OUTPUT LOAD (A)
FIGURE 7. V OUT1 = 1.5V FREQUENCY vs LOAD
9
OUTPUT LOAD (A)
FIGURE 8. V OUT1 = 1.5V RIPPLE vs LOAD
FN6396.1
August 10, 2010
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