ISL6744A_14 Datasheet, PDF (6/18 Pages) Intersil Corporation – Intermediate Bus PWM Controller

ISL6744A
Typical Performance Curves
65
60
55
50
45
1-10⁴
1-10³
100
CT = 470pF
CT = 680pF
CT = 1000pF
CT = 220pF
CT = 100pF
40
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10
RTD CURRENT (mA)
FIGURE 1. OSCILLATOR CT DISCHARGE CURRENT GAIN
10
10 20 30 40 50 60 70 80 90 100
RTD (kΩ)
FIGURE 2. DEADTIME vs CAPACITANCE
600
500
400
300
200
100
0
100 200 300 400 500 600 700 800 900 1000
CT (pF)
FIGURE 3. CAPACITANCE vs OSCILLATOR FREQUENCY
(RTD = 49.9kΩ)
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40 -25 -10 5 20 35 50 65 80 95 110
TEMPERATURE (°C)
FIGURE 4. CHARGE CURRENT vs TEMPERATURE
1.07
1.06
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0
10 20 30 40 50 60 70 80 90 100
RTD (kΩ)
FIGURE 5. TIMING CAPACITOR VOLTAGE vs RTD
6
FN6554.0
October 8, 2007