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ISL78208 Datasheet, PDF (9/25 Pages) Intersil Corporation – Wide VIN Dual Standard Buck Regulator with 3A/3A Continuous Output Current
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ISL78208
Typical Performance Curves Circuit of Figure 2. VIN = 12V, VOUT1 = 5V, VOUT2 = 3.3V, IOUT1 = 3A, IOUT2 = 3A,
TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C.
100
100
90
90
80
12VOUT 1MHz
9VOUT 1MHz
70
5VOUT 500kHz
60
3.3VOUT 500kHz
50
1.8VOUT 300kHz
40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 4. EFFICIENCY vs LOAD, TA = +25°C, VIN = 28V
80
5VOUT
70
3.3VOUT
60
50
40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 5. EFFICIENCY vs LOAD, TA = +25°C, FSW = 500kHz,
VIN = 12V
100
90
80
9VIN
12VIN
70
28VIN
60
50
40
0
1
2
3
4
5
6
OUTPUT LOAD (A)
FIGURE 6. EFFICIENCY vs LOAD, TA = +25°C, CURRENT SHARING
5VOUT, FSW = 500kHz
4.2
3.5
2.8
2.1
1.4
12VIN
0.7
28VIN
9VIN
0.0
0
1
2
3
4
5
6
OUTPUT LOAD (A)
FIGURE 7. POWER DISSIPATION vs LOAD, TA = +25°C,
CURRENT SHARING 5VOUT, FSW = 500kHz
4.8
4.0
3.2
2.4
1.6
12VIN
0.8
28VIN
9VIN
0.0
0
1
2
3
4
5
6
OUTPUT LOAD (A)
FIGURE 8. POWER DISSIPATION vs LOAD, TA = +85°C,
CURRENT SHARING 5VOUT, FSW = 500kHz
5.04
5.03
5.02
5.01
5.00
4.99
28VIN
9VIN
12VIN
4.98
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT LOAD (A)
FIGURE 9. VOUT REGULATION vs LOAD, CHANNEL 1,
TA = +25°C, 5VOUT, FSW = 500kHz
9
FN8354.0
July 12, 2013
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