Technical Reference Notes

ALD12/18/20/25 Series

(Single Output 16

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

All

-

-

2

5

ms

Enable to Output Turn-ON Delay

All

-

-

-

10

ms

Enable Pin: Active

All

-

-

-

10

ms

Switching Frequency

All

2V5, 5V0

-

560

650

625

725

690

800

KHz

Dynamic Response:

Peak Deviation for Load Step

Change from

Settling Time to within 1% of

Peak Deviation for Load Step

Change from

Settling Time to within 1% of

∆I

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 Full 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

Output Voltage Trim Range

5

All

90

110

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.

5. Refer to the output trim equations provided (Equations 1 and 2).