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參數(shù)資料
| 型號(hào)： | LEN-5/25-D12H |
| 廠商： | MURATA POWER SOLUTIONS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 355K |
| 代理商： | LEN-5/25-D12H |
MDC_LEN D12 Models.B01 Page 6 of 10
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
LEN-D12 Models
Non-Isolated, 28A Eighth Brick
DC/DC Converters
Output Reverse Conduction
Many DC/DCs using synchronous rectication suffer from Output Reverse
Conduction. If those devices have a voltage applied across their output before
a voltage is applied to their input (this typically occurs when another power
supply starts before them in a power-sequenced application), they will either
fail to start or self destruct. In both cases, the cause is the “freewheeling” or
“catch” FET biasing itself on and effectively becoming a short circuit.
LEN D12 DC/DC converters do not suffer from Output Reverse Conduc-
tion. They employ proprietary gate drive circuitry that makes them immune to
applied output voltages.
UP
VO – VO NOM
RT (kΩ) =
0.4
DOWN
VO NOM – VO
RT
(kΩ) =
– X
0.5(VO – 0.8)
UP
VO – VO NOM
RT (kΩ) =
6
DOWN
VO NOM – VO
RT
(kΩ) =
– X
7.5(VO – 0.8)
UP
VO – VO NOM
RT (kΩ) =
0.944
DOWN
VO NOM – VO
RT
(kΩ) =
– 3.09
1.18(VO – 0.8)
LEN-1/28-D12:
X = 0.261
LEN-1.2/28-D12:
X = 0.750
LEN-1.5/28-D12:
X = 1.24
LEN-1.8/28-D12:
X = 1.62
LEN-2/28-D12:
X = 1.62
LEN-3.3/28-D12:
X = 14.3
LEN-5/25-D12:
X = 9.53
LEN-2.5/28-D12
Note: LEN-0.8/28-D12 is not trimmable.
Trim Equations
Trim
Down
Trim
Up
LOAD
+INPUT
COMMON
+OUTPUT
TRIM
COMMON
Note:
Install either a xed
trim-up resistor or a
xed trim-down resistor
depending upon desired
output voltage.
A trimpot can be used to determine the value of a single xed resistor
which can then be connected, as shown in Figure 5, between the Trim pin and
+Output to trim down the output voltage, or between the Trim pin and Common
to trim up the output voltage. Fixed resistors should have absolute TCR’s less
than 100ppm/
°C to ensure stability.
Figure 5. Trim Connections Using Fixed Resistors
The equations below can be used as starting points for selecting specic trim
resistor values. Recall, untrimmed devices are guaranteed to be
±1% accurate.
Adjustment beyond the specied adjustment range is not recommended.
Note: Resistor values are in kΩ. Accuracy of adjustment is subject
to tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. VOMON = nominal output voltage.
相關(guān)PDF資料 |
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| LEN-1.2/28-D12H | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-1/28-D12H-C | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-0.8/28-D12MH | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-2/28-D12MH | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LEN-1/28-D12MH | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
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