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参数资料
| 型号： | LSM-1/10-D12-C |
| 厂商： | MURATA POWER SOLUTIONS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, SMT-6 |
| 文件页数： | 16/18页 |
| 文件大小： | 1583K |
| 代理商： | LSM-1/10-D12-C |
MDC_LSM 10A D12 Models.B01 Page 7 of 18
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
www.murata-ps.com
Single Output
LSM-10A D12 Models
Non-Isolated, 12Vin, 0.75-5Vout DC/DC Converters
Figure 7.Trim Connections Using Fixed Resistors
Figure 6.Trim Connections Using a Trimpot
Trim Equations
UP
VO – VO NOM
RT (k
) =
1.46
DOWN
VO NOM – VO
RT
(k
) =
– X
1.82(VO – 0.8)
UP
VO – VO NOM
RT (k
) =
3.72
DOWN
VO NOM – VO
RT
(k
) =
– X
4.64(VO – 0.8)
UP
VO – VO NOM
RT (k
) =
6
DOWN
VO NOM – VO
RT
(k
) =
– X
7.5(VO – 0.8)
LSM-1/10-D12:
X = 0.909
LSM-1.1/10-D12: X = 2.49
LSM-1.2/10-D12: X = 3.09
LSM-1.3/10-D12: X = 4.12
LSM-1.5/10-D12: X = 13.3
LSM-1.8/10-D12: X = 16.9
LSM-2/10-D12:
X = 15.4
LSM-2.5/10-D12: X = 20
LSM-3.3/10-D12: X = 15
LSM-5/10-D12:
X = 10
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.
If the output current exceeds it maximum rating by typically 70% or if the
output voltage drops to less than 98% of it original value, the LSM D12's inter-
nal overcurrent-detection circuitry immediately turns off the converter, which
then goes into a "hiccup" mode. While hiccupping, the converter will continu-
ously attempt to restart itself, go into overcurrent, and then shut down. Once
the output short is removed, the converter will automatically restart itself.
Output Voltage Trimming (Except "T" models—See "T" Trimming)
Allowable trim ranges for each model in the LSM D12 SMT Series are ±10%.
The LSM-T/10-D12 has a user-selectable output range of +0.75V to +5V.
Trimming is accomplished with either a trimpot or a single fixed resistor. The
trimpot should be connected between +Output and Common with its wiper
connected to the Trim pin as shown in Figure 6 below.
A trimpot can be used to determine the value of a single fixed resistor
which can then be connected, as shown in Figure 7, 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.
The following trim equations can be starting points for selecting specific
trim-resistor values. Recall, untrimmed devices are guaranteed to be
±1.25%
accurate.
Adjustment beyond the specified adjustment range is not recommended.
When using trim in combination with Remote Sense, the maximum rated power
must not be exceeded (see Remote Sense).
Note: Resistor values are in k
. Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted, initial output accuracy.
VO = desired output voltage. Vonom = nominal output voltage.
Note: LSM-0.8/10-D12 is not trimmable.
"T" Model, LSM-T/10-D12, Trimming
This version of the LSM 10A series offers a special output voltage trimming
feature which is fully compatible with competitive units. The output voltage
may be varied from 0.75 to 5 Volts using a single external trim up resistor con-
nected from the Trim input to Output Common. If no trim resistor is attached
(Trim pin open), the output is 0.7525 Volts.
The trim may also be adjusted using an external reference voltage con-
nected to the Trim input.
As with other trim adjustments, use a 1% metal film precision resistor with
low temperature coefficient (±100 ppm/°C or less) mounted close to the con-
verter with short leads. Also be aware that the output accuracy is ±2% (typical)
therefore you may need to vary this resistance slightly to achieve your desired
output setting.
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