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DATA SHEET
Standby Output V SB
V SB nom
Nominal Output Voltage
VSB_SEL = 1
3.3
VDC
V SB set
Output Setpoint Accuracy
0.5 ? I SB nom , T amb = 25°C
VSB_SEL = 0
VSB_SEL = 0 / 1
-0.5
5.0
+0.5
VDC
% V 1nom
dV SB tot
Total Regulation
V i min to V i max , 0 to 100% I SB nom , T a min to T a max
-1
+1
% V SBnom
V SB = 3.3 VDC , normal airflow
16.5
P SB nom
Nominal Output Power
V SB = 3.3 VDC , reverse airflow
11.5
W
V SB = 5.0 VDC, normal/reverse airflow
V SB = 3.3 VDC, normal airflow
16.5
5
I SB nom
Nominal Output Current
V SB = 3.3 VDC, reverse airflow
3.5
ADC
V SB = 5.0 VDC, normal/reverse airflow
3.3
V SB pp
Output Ripple Voltage
V SB nom , I SB nom , 20 MHz BW (See Section 6.1)
80
mVpp
dV SB
Droop
0 - 100 % I SB nom
VSB_SEL = 1
VSB_SEL = 0
67
44
mV
VSB_SEL = 1, normal airflow
5.25
6
I SB max
Current Limitation
VSB_SEL = 1, reverse airflow
4
4.75
ADC
VSB_SEL = 0, normal/reverse airflow
3.45
4.3
dV SBdyn
T rec
t AC VSB
t VSB rise
C Load
Dynamic Load Regulation
Recovery Time
Start-up Time from AC
Rise Time
Capacitive Loading
Δ I SB = 50% I SB nom , I SB = 5 … 100% I SB nom ,
d I o /d t = 0.5 A/μs, recovery within 1% of V 1 nom
V SB = 90% V SB nom (see Figure 26 )
V SB = 10…90% V SB nom (see Figure 26 )
T amb = 25°C
-3
4
3
250
2
20
10000
% V SBnom
μs
sec
ms
μF
5.1
OUTPUT VOLTAGE RIPPLE
Internal capacitance at the 12 V output (behind the OR-ing circuitry) is minimized to prevent disturbances during hot plug. In
order to provide low output ripple voltage in the application, external capacitors should be added close to the power supply
output.
The setup of Figure 6 has been used to evaluate suitable capacitor types. The capacitor combinations of Table 1 and
Table 2 should be used to reduce the output ripple voltage. The ripple voltage is measured with 20 MHz BWL, close to the
external capacitors.
Figure 6 - Output ripple test setup
V 1
PGND
V SB
Connection board
Note: Care must be taken when using ceramic capacitors with a total capacitance of 1 μF to 50 μF on output V 1 , due to their
high quality factor the output ripple voltage may be increased in certain frequency ranges due to resonance effects.
Table 1 - Suitable capacitors for V 1
Table 2 - Suitable capacitors fo r V SB
External capacitor V1
2Pcs 47 μF/16 V/X5R/1210
1Pcs 1000 μF/16 V/Low ESR Aluminum /?10x20
1Pcs 270 μF/16 V/Conductive Polymer/?8x12
2Pcs 47 μF/16 V/X5R/1210 plus
dV1max
150
120
120
60
Unit
mVpp
mVpp
mVpp
mVpp
External capacitor VSB
1Pcs 10 μ F/16 V/X5R/1206
2Pcs 10 μ/ F16 V/X5R/1206
1Pcs 47 μF/16 V/X5R/1210
2Pcs 100 μ F/6.3 V/X5R/1206
dV1max
80
50
40
30
Unit
mVpp
mVpp
mVpp
mVpp
1Pcs 270 μF Conductive Polymer OR
1Pcs 1000 μF Low ESR AlCap
BCD.00040_AG Sep-11-2013
5
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