ISL6744 Datasheet, PDF (6/18 Pages) Intersil Corporation – Intermediate Bus PWM Controller

ISL6744
Typical Performance Curves
65
1-10⁴
60
CT =
1000pF
680pF
1-10³
470pF
55
CT = 270pF
50
CT = 100pF
100
45
40
0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1
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
FN9147.8
September 22, 2005