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參數(shù)資料
| 型號： | ULQ-2/25-D24P |
| 廠商： | CD TECHNOLOGIES INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | 1.450 X 2.300 INCH, 0.350 INCH HEIGHT, QUARTER BRICK PACKAGE-8 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 566K |
| 代理商： | ULQ-2/25-D24P |
8 - 2 5 A M P , S I N G L E O U T P U T D C / D C C O N V E R T E R S
ULQ Series
UP
VO – 1.5
RT (k
) =
–10.2
6.23(VO – 1.226)
1.5 – VO
RT
(k
) =
–10.2
7.64
DOWN
UP
VO – 1.8
RT (k
) =
–10.2
7.44(VO – 1.226)
1.8 – VO
RT
(k
) =
–10.2
9.12
DOWN
UP
VO – 2.5
RT (k
) =
–10.2
10(VO – 1.226)
2.5 – VO
RT
(k
) =
–10.2
12.26
DOWN
UP
VO – 3.3
RT (k
) =
–10.2
13.3(VO – 1.226)
3.3 – VO
RT
(k
) =
–10.2
16.31
DOWN
ULQ-1.5/15-D48, ULQ-1.5/25-D24 & D48
ULQ-1.8/15-D48, ULQ-1.8/25-D24 & D48
ULQ-2.5/15-D48, ULQ-2.5/20-D24 & D48
ULQ-3.3/15-D48, ULQ-3.3/20-D24 & D48
ULQ-2/15-D48, ULQ-2/15-D24 & D48
UP
VO – 1.2
RT (k
) =
–1.413
1.308(VO – 0.793)
1.2 – VO
RT
(k
) =
–1.413
1.037
DOWN
ULQ-1.2/15-D48 & ULQ-1.2/25-D48
UP
VO – 2
RT (k
) =
–10.2
8.28(VO – 1.226)
2 – VO
RT
(k
) =
–10.2
10.15
DOWN
UP
VO – 5
RT (k
) =
–10.2
20.4(VO – 1.226)
5 – VO
RT
(k
) =
–10.2
25.01
DOWN
ULQ-5/15-D24, -D48
UP
VO – 12
RT (k
) =
–10.2
49.6(VO – 1.226)
12 – VO
RT
(k
) =
–10.2
60.45
DOWN
ULQ-12/8-D24, ULQ-12/10-D48
Output overvoltage protection is monitored at the output voltage pin, not the
Sense pin. Therefore, excessive voltage differences between VOUT and Sense
in conjunction with trim adjustment of the output voltage can cause the over-
voltage protection circuitry to activate (see Performance Specications for
overvoltage limits). Power derating is based on maximum output current and
voltage at the converter's output pins. Use of trim and sense functions can
cause output voltages to increase, thereby increasing output power beyond
the conveter's specied rating, or cause output voltages to climb into the
output overvoltage region. Therefore, the designer must ensure:
(VOUT at pins)
× (IOUT) ≤ rated output power
Trimming Output Voltage
ULQ converters have a trim capability (pin 6) that enables users to adjust
the output voltage from +10% to –20% (refer to the trim equations and trim
graphs that follow). Adjustments to the output voltage can be accomplished
via a trim pot (Figure 5) or a single xed resistor as shown in Figures 6 and 7.
A single xed resistor can increase or decrease the output voltage depending
on its connection. Resistors should be located close to the converter and
have TCR's less than 100ppm/°C to minimize sensitivity to changes in
temperature. If the trim function is not used, leave the trim pin open.
LOAD
RTRIM DOWN
+OUTPUT
–INPUT
+INPUT
ON/OFF
CONTROL
TRIM
+SENSE
–OUTPUT
–SENSE
4
5
1
3
6
8
7
2
LOAD
RTRIM UP
+OUTPUT
–INPUT
+INPUT
ON/OFF
CONTROL
TRIM
+SENSE
–OUTPUT
–SENSE
4
5
1
3
6
8
7
2
Figure 5.Trim Connections Using A Trimpot
Figure 7.Trim Connections To Decrease Output Voltages Using Fixed Resistors
A single resistor connected from the Trim pin (pin 6) to the +Sense (pin 7) will
increase the output voltage. A resistor connected from the Trim Pin (pin 6) to
the –Sense (pin 5) will decrease the output voltage.
Trim adjustments greater than the specied +10%/–20% can have an
adverse affect on the converter’s performance and are not recommended.
Excessive voltage differences between VOUT and Sense, in conjunction with
trim adjustment of the output voltage, can cause the overvoltage protection
circuitry to activate (see Performance Specications for overvoltage limits).
Temperature/power derating is based on maximum output current and volt-
age at the converter's output pins. Use of the trim and sense functions can
cause output voltages to increase, thereby increasing output power beyond
the converter's specied rating, or cause output voltages to climb into the
output overvoltage region. Therefore:
(VOUT at pins) x (IOUT)
rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be suscep-
tible to noise pickup when connected to long conductors in noisy environ-
ments. In such cases, a 0.22F capacitor can be added to reduce this long
lead effect.
LOAD
+OUTPUT
–INPUT
+INPUT
ON/OFF
CONTROL
TRIM
+SENSE
–OUTPUT
–SENSE
4
5
1
3
6
8
7
2
5-22
TURNS
Figure 6.Trim Connections To Increase Output Voltages Using Fixed Resistors
6
Trim Equations
Note: Resistor values are in k
. Adjustment accuracy is subject to resistor
tolerances and factory-adjusted output accuracy. VO = desired output voltage.
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