IR3553_15 Datasheet, PDF (10/22 Pages) International Rectifier – 40A Integrated PowIRstage

40A Integrated PowIRstage® IR3553
TYPICAL OPERATING CHARACTERISTICS (CONTINUED)
Circuit of Figure 32, V_IN=12V, V_OUT=1.2V, ƒ_SW = 400kHz, L=150nH (0.29mΩ), VCC=7V, T_AMBIENT = 25°C, no heat sink, no air flow,
8-layer PCB board of 3.7” (L) x 2.6” (W), no PWM controller loss, no inductor loss, unless specified otherwise.
1.30
9.0
1.25
7.5
1.20
6.0
1.15
4.5
1.10
3.0
1.05
1.5
1.00
0.0
0.95
-1.5
0.90
-3.0
0.85
-4.5
0.80
-6.0
5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00
VCC Voltage (V)
Figure 13: Normalized Power Loss vs. VCC Voltage
PWM
5V/div
SW
5V/div
GATEL
10V/div
400ns/div
Figure 16: Switching Waveform, I_OUT = 0A
1.30
9.0
1.25
7.5
1.20
6.0
1.15
4.5
1.10
3.0
1.05
1.5
1.00
0.0
0.95
-1.5
0.90
-3.0
0.85
-4.5
0.80
-6.0
120 130 140 150 160 170 180 190 200 210
Output Inductor (nH)
Figure 14: Power Loss vs. Output Inductor
PWM
5V/div
SW
5V/div
GATEL
10V/div
400ns/div
Figure 17: Switching Waveform, I_OUT = 40A
60
50
Vcc=6.8V
40
Vcc=5V
30
20
10
0
200
300
400
500
600
700
800
900 1000
fsw (kHz)
Figure 15: VCC Current vs. Switching Frequency
10 July 16, 2014 | DATASHEET V3.3
PWM
2V/div
SW
5V/div
40ns/div
Figure 18: PWM to SW Delays, I_OUT = 10A