isl9440b Intersil Corporation, isl9440b Datasheet - Page 17

• Manufacturer Part Number: isl9440b
• Description: Triple Step-down Pwm And Single Linear Controller With Programmable Soft-start
• Manufacturer: Intersil Corporation

Typical Performance Curves of ISL9440C
(Oscilloscope Plots are Taken Using the ISL9440CEVAL1Z Evaluation Board, V
FIGURE 35. PWM1 EFFICIENCY vs LOAD (V
FIGURE 37. PWM3 EFFICIENCY vs LOAD (V
100
95
90
85
80
75
70
65
60
55
50
90
85
80
75
70
65
60
55
50
45
40
0
0
V
V
IN
IN
= 9VDC
= 9VDC
FOR UPPER MOSFET AND LOWER MOSFET)
FOR UPPER MOSFET AND LOWER MOSFET)
1
1
V
IN
V
= 16VDC
2
IN
= 16VDC
LOAD CURRENT (A)
2
LOAD CURRENT (A)
3
V
17
IN
V
IN
= 12VDC
4
3
= 12VDC
FIGURE 39. SWITCHING FREQUENCY vs TEMPERATURE
5
720
680
640
600
560
520
480
440
400
4
-50
O
O
6
= 1.0V, IRF7907
= 5.0V, IRF7907
V
5
IN
ISL9440B, ISL9440C
7
= 12.0V/0A LOAD
8
6
0
TEMPERATURE (°C)
V
IN
FIGURE 36. PWM2 EFFICIENCY vs LOAD (V
IN
= 12V Unless Otherwise Noted).
660
630
600
570
540
100
= 19.0V/0A LOAD
95
90
85
80
75
70
65
60
55
50
50
5
0
FIGURE 38. SWITCHING FREQUENCY vs V
V
IN
FOR UPPER MOSFET AND LOWER MOSFET)
= 9VDC
1
V
IN
10
= 16VDC
2
100
LOAD CURRENT (A)
3
V
V
IN
IN
15
(V)
= 12VDC
4
5
O
20
= 3.3V, IRF7907
6
January 15, 2009
IN
7
FN6799.0
25
8