ALQ15XX48X Datasheet, PDF (9/19 Pages) Astec America, Inc – Industry Standard ¼ Brick: 36V-75V Input / 60W Output Power

Technical Reference Notes
ALQ15XX48X Series
(Open Frame Dual Output Quarter Brick)
Basic Operation and Features
INPUT UNDER VOLTAGE LOCKOUT
To prevent any instability to the converter that may affect and consequently damage the end system, the ALQ15 series have
been designed to turn-on once V_IN is in the voltage range of 35-36 VDC. Likewise, it has also been programmed to turn-off
when V_IN drops down to 32-34 VDC.
OUTPUT VOLTAGE ADJUST/TRIM
The converter comes with a TRIM pin (PIN 6), which is used to adjust both outputs simultaneously by as much as 90% to
110% of its set point. This is achieved by connecting an external resistor as described below.
To INCREASE the output voltages, external R_TRIM-UP resistor should be connected between TRIM PIN (Pin6) and RTN PIN
(Pin 5). Please refer to Figure 3 for the resistor configuration and Table 1 for the required resistor values in attaining the
desired output adjustment
To DECREASE the output voltages, external R_TRIM-DOWN resistor should be connected between TRIM PIN (Pin 6) and V_OUT1
(Pin 7). This trim configuration is true for the AF, FG, FY and GM standard versions. Please refer to Figure 4 for the resistor
configuration and Table 1 for the required resistor values in attaining the desired output adjustment. For ALQ15FG48N-6D,
R_TRIM-DN resistor is connected between the TRIM PIN and V_OUT2 (2.5V output pin).
Figure 3. External Trim resistor setup to increase output for
all versions.
Figure 4. External Trim resistor setup to decrease output for
AF; FG; FY and GM standard versions only.
TABLE 1-A
ALQ15AF48 (5V / 3.3V)
? [%} R_TRIM-UP [kO]
+1
32.45
+2
13.66
+3
7.83
+4
4.99
+5
3.31
+6
2.20
+7
1.41
+8
0.82
+9
0.36
+10
0.00
? [%}
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
R_TRIM-DOWN [kO]
32.39
15.09
8.95
5.80
3.89
2.60
1.67
0.98
0.44
0.00
MODEL: ALQ15 SERIES
MARCH 4, 2004 - REVISION 01
TABLE 1-B
ALQ15FG48 / ALQ15FY48
? [%} R_TRIM-UP [kO] ? [%}
+1
12.42
-1
+2
5.26
-2
+3
3.02
-3
+4
1.93
-4
+5
1.28
-5
+6
0.85
-6
+7
0.55
-7
+8
0.32
-8
+9
0.14
-9
+10
0.00
-10
R_TRIM-DOWN [kO]
12.58
5.86
3.47
2.25
1.51
1.01
0.65
0.38
0.17
0.00
SHEET 9 OF 19