Technical Reference Notes
ALD12/18/20/25 Series
(Single Output 16
th
Brick)
MODEL: ALD12/ 18/20/ 25 SERIES SHEET 4 OF 20
AUGUST 17, 2005 – REVISION C
Electrical Specifications (continued)
OUTPUT SPECIFICATIONS (continued)
Parameter Device Symbol Min Typ Max Unit
Turn-On Response Time
4
V
IN
= V
IN-M IN to
V
IN-MAX
All - - 2 5 ms
Enable to Output Turn-ON Delay
V
IN
= V
IN-M IN to
V
IN-MAX
I
O
= I
O,MIN to
I
O,MAX
All - - - 10 ms
+V
IN
to Output Turn-On Delay
Enable Pin: Active
V
IN
= V
IN-M IN to
V
IN-MAX
I
O
= I
O,MIN to
I
O,MAX
All - - - 10 ms
Switching Frequency All
2V5, 5V0
- 560
650
625
725
690
800
KHz
Dynamic Response:
C
O
= use Figure 2 test setup
Peak Deviation for Load Step
Change from
I
O
= 50% to 75% of I
O, Max
:
Settling Time to within 1% of
output set point voltage – V
O,SET
:
Peak Deviation for Load Step
Change from
I
O
= 50% to 25% of I
O, Max
:
Settling Time to within 1% of
output set point voltage – V
O,SET
:
∆I
O
/∆t
All
All
All
All
-
-
-
-
-
-
-
-
-
-
0.1
3
80
3
80
-
6
200
6
200
A/µs
% Vo
µs
% Vo
µs
Output Overshoot at Turn-on
Passive Resistive Ful l Load
Vo ≤ 1V8
Vo > 1V8
-
-
-
-
0
0
5
4
%Vo
Output Enable ON/OFF
Enable Signal Slew Rate
Negative Enable ("N" suffix)
Enable Pin Voltage: Mod-ON
Mod-OFF
All
N suffix
-
-
-
0.01
-0.5
2.95
-
-
-
-
1.2
20
V/ms
V
V
Positive Enable (No suffix)
Enable Pin voltage: Mod-ON
Mod-OFF
No suffix
-
-
2.95
-0.5
-
-
20
1.2
V
Output Voltage Remote Sensing All - - - 10 %V
O
Output Vo l tage Trim Range
5
All 90 110 %V
O
NOTES: 1. The converter is not internally fused; an external fuse must be used.
2. Refer to Figure 1 for the input reflected ripple test setup.
3. Refer to Figure 2 for the Output Ripple and Noise Test Measurement Setup.
4
. Measure output rise time from 10%V
O
to 90%V
O
.
5. Refer to the output trim equations provided (Equations 1 and 2).
