Triple-Output Power-Supply Controller
for Notebook Computers
____________________________Typical Operating Characteristics (continued)
(Circuit of Figure 1, Transpower TTI5902 transformer, TA = +25°C, unless otherwise noted.)
+5V LOAD-TRANSIENT RESPONSE
+5V LINE-TRANSIENT RESPONSE, RISING
3A
LOAD CURRENT
0A
+5V OUTPUT
50mV/div
+5V OUTPUT
50mV/div
VIN, 10V TO 16V
2V/div
VIN = 15V
200µs/div
ILOAD = 2A
+5V LINE-TRANSIENT RESPONSE, FALLING
20µs/div
+5V OUTPUT
50mV/div
ILOAD = 2A
20µs/div
VIN, 16V TO 10V
2V/div
OUTPUT NOISE SPECTRUM
30
20 VIN = 10V
VOUT = 5V
10 IOUT = 50mA
0
-10
-20
-30
1
10
100
FREQUENCY (kHz)
OUTPUT NOISE SPECTRUM
30
20 VIN = 8V TO 12V
10
(PLOTS SUPERIMPOSED)
VOUT = 5V
0 IOUT = 1A
-10
-20
-30
-40
-50
-60
10k
100k
1M
FREQUENCY (Hz)
6 _______________________________________________________________________________________