ISL6115_07 Datasheet, PDF (7/12 Pages) Intersil Corporation – Power Distribution Controllers

ISL6115, ISL6116, ISL6117, ISL6120
Example
A typical -48V supply may vary from -36 to -72V. Therefore,
V_BUS,MAX = -72V
V_BUS,MIN = -36V
I_CHIP = 15mA (max)
Sizing R_CL:
R_CL = (V_BUS,MIN - 12)/I_C
R_CL = (36 - 12)/0.015
R_CL = 1.6kΩ [Typical Value = 1.58kΩ]
Power Rating of R_CL:
P_RCL = I_C(V_BUS,MAX - 12)
P_RCL = (0.015)(72 - 12)
P_RCL = 0.9W [Typical Value = 1W]
DD1 Current Rating:
I_DD1 = (_VBUS,MAX - 12)/R_CL
I_DD1 = (72 - 12)/1.58kΩ
I_DD1 = 38mA [Typical Value = 12V rating, 50mA reverse
current]
Typical Performance Curves
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
FIGURE 3. VDD BIAS CURRENT
20.2
20.0
19.8
19.6
19.4
19.2
19.0
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
FIGURE 4. ISET SOURCE CURRENT
20.50
20.32
20.16 ^{CTIM - 0V}
20.00
19.82
19.66
19.50
0
10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
FIGURE 5. C_TIM CURRENT SOURCE
1.89
1.88
1.87
1.86
1.85
1.84
1.83
0 10 20 30 40 50 60 70 80 90 100
TEMPERATURE (°C)
FIGURE 6. C_TIM OC VOLTAGE THRESHOLD
7
February 6, 2007