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| 型號： | USQ-3.3/20-D48NDH |
| 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 2.280 INCH, 0.400 INCH HEIGHT, QUARTER BRICK PACKAGE-8 |
| 文件頁數(shù)： | 19/22頁 |
| 文件大?。?/td> | 2199K |
| 代理商： | USQ-3.3/20-D48NDH |
USQ Series
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 To Increase Output Voltages Using Fixed Resistors
Figure 6.Trim Connections To Decrease Output Voltages Using Fixed Resistors
6
Trim Equations
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
UP
VO – 5
RT (k
) =
–10.2
20.4(VO – 1.226)
5 – VO
RT
(k
) =
–10.2
25.01
DOWN
USQ-1.5/20-D48
USQ-1.8/20-D48
USQ-2.5/20-D48
USQ-3.3/20-D48
USQ-5/20-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
USQ-1.2/20-D48
UP
VO – 12
RT (k
) =
–10.2
49.6(VO – 1.226)
12 – VO
RT
(k
) =
–10.2
60.45
DOWN
USQ-12/8.3-D24, -D48
UP
VO – 15
RT (k
) =
–10.2
62.9(VO – 1.226)
75.5(VO – 1.226)
15 – VO
RT
(k
) =
–10.2
76.56
DOWN
USQ-15/6.7-D24, -D48
UP
VO – 18
RT (k
) =
–10.2
18 – VO
RT
(k
) =
–10.2
92.9
DOWN
USQ-18/5.6-D24, -D48
101(VO – 1.226)
UP
VO – 24
RT (k
) =
–10.2
24 – VO
RT
(k
) =
–10.2
124.2
DOWN
USQ-24/4.2-D24, -D48
Note: Resistor values are in k
. Adjustment accuracy is subject to resistor
tolerances and factory-adjusted output accuracy. VO = desired output voltage.
Standard USQ's have a "positive trim" where 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. DATEL also offers a "negative trim" function (D
sufx added to the part number). Contact DATEL for information on negative
trim devices.
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 USQ'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.
2 0 A , 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
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