
Technical Reference Notes
ALD12/18/20/25 Series
(Single Output 16
th Brick)
MODEL: ALD12/18/20/25 SERIES
SHEET 1 OF 20
AUGUST 17, 2005 – REVISION C
ALD12/18/20/25 Single Output 16
th Brick: 60Watts
The ALD12/18/20/25 series is Astec’s latest 16
th Brick industry standard offering. Operating from an input voltage range of 36V to
75V, the series provides 6 configured outputs from 1.2V all the way up to 5V. It delivers up to 25A max current for 1.8V and
lower at impressive levels of efficiency. The series comes with industry standard features such as Input UVLO; non-latching OCP,
OVP and OTP; Output Trim; Differential Remote Sense pins. With its wide operating temperature range of -40°C to 85°C
ambient, the converters are deployable into almost any environment.
Special Features
Industry Standard 16
th Brick Footprint
Low Ripple and Noise
Output pre-bias startup
Regulation to zero load
High Capacitive Load Start-up
Fixed Switching Frequency
Industry standard features: Input UVLO;
Enable; non-latching OVP, OCP and OTP;
Output Trim, Differential Remote Sense
Meets Basic Insulation
Environmental Specifications
-40C to 85C Operating Temperature
-40C to 125C Storage Temperature
MTBF > 1 million hours
Electrical Parameters
Input
Input Range
36-75 VDC
Input Surge
100V / 100ms
Control
Enable
TTL compatible
(Positive or Negative Logic Enable Options)
Output
Load Current
Up to 25A max (VO ≤
≤≤≤ 1.8V)
Line/Load Regulation
< 1% VO
Ripple and Noise
40mVP-P typical
Adjust Range
±10% VO
Transient Response
3% Typical deviation
50% to 75% Load Change
80
s settling time (Typ)
Remote Sense
+10%VO
Over Current
120% max
Protection
Over Voltage
130% max
Protection
Over Temperature
110
°°°°C
Protection
Safety
UL + cUL 60950, Recognized
EN60950 through TUV-PS