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: 60Wa tts
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 Foo t print
• Low Ripple a nd Noise
• Output pre-bias st artup
• 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
• Me ets Basic Insulation
Environmental Specifications
• -40ºC to 85ºC Operating Temperature
• -40ºC to 125ºC Storage Temperature
• MTB F > 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 (V
O
≤
≤≤
≤ 1.8V)
Line/Load Regulation < 1% V
O
Ripple and Noise 40mV
P-P
typical
Adjust Range ±10% V
O
Transient Response 3% Typical deviation
50% to 75% Load Change
80µ
µµ
µs settling time (Typ)
Remote Sense +10%V
O
Over Current 120% max
Protection
Over Voltage 130% max
Protection
Over Temperature 110 °
°°
°C
Protection
Safety
UL + cUL 60950, Recognized
EN60950 through TUV-PS