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参数资料
| 型号： | LSM2-T/6-W3NG-C |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 19.8 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT |
| 文件页数： | 16/17页 |
| 文件大小： | 1394K |
| 代理商： | LSM2-T/6-W3NG-C |
LSM2 Series
Single Output, Non-isolated, Selectable-Output POL DC/DC Converters
MDC_LSM2_A01 Page 8 of 7
P O W E R E L E C T R O N I C S D I V I S I O N
D C / D C C O N V E R T E R S
www.cd4power.com
D12 Models Voltage Trim Equation:
VTRIM (in Volts) = 0.7 –(0.0667 x (VO – 0.7525))
The LSM2 D2 fixed trim voltages to set the output voltage are:
VOUT
0.7525V .0V
.2V
.5V
.8V
2.5V
3.3V
5V
VTRIM (V)
Open
0.6835 0.670
0.650
0.630
0.583
0.530 0.466
RTRIM (W) = _____________ –50
VO – 0.7525
2070
RTRIM (W) = _____________ –000
VO – 0.7525
0500
IMPORTANT: On W3 models only, for outputs greater than 3 Volts up to 3.3
Volts maximum, the input supply must be 4.5 Volts minimum. To retain proper
regulation, do not exceed the 3.3V output.
As with other trim adjustments, be sure to use a precision low-tempco resis-
tor (±00 ppm/°C) mounted close to the converter with short leads. Also be
aware that the output voltage accuracy is ±2% (typical) therefore you may
need to vary this resistance slightly to achieve your desired output setting.
Two different trim equations are used for the W3 and D2 models.
W3 Models Resistor Trim Equation:
The W3 models fixed trim resistors to set the output voltage are:
VOUT (Typ.) 0.7525V
.0V
.2V
.5V
.8V
2.5V
3.3V
RTRIM (k
W)
Open
80.02
4.973
23.077
5.004
6.947
3.6
D12 Models Resistor Trim Equation:
VOUT
0.7525V .0V
.2V
.5V
.8V
2.5V
3.3V
5V
RTRIM (k
W) Open 4.424 22.46
3.05
9.024
5.009
3.22
.472
Voltage Trim
The LSM2 Series may also be trimmed using an external voltage applied
between the Trim input and Output Common. Be aware that the internal “load”
impedance looking into trim pin is approximately 5 Kilohms. Therefore, you
may have to compensate for this in the source resistance of your external
voltage reference.
Use a low noise DC reference and short leads. Mount the leads close to the
converter. Consider using a small bypass capacitor (0.F ceramic) between
trim and output common to avoid instability.
Two different trim equations are used for the W3 and D2 models.
W3 Models Voltage Trim Equation:
VTRIM (in Volts) = 0.7 –(0.698 x (VO – 0.7525))
The LSM2 W3 fixed trim voltages to set the output voltage are:
VOUT (Typ.) 0.7525V
.0V
.2V
.5V
.8V
2.5V
3.3V
VTRIM
Open
0.6928V 0.624V 0.573V 0.522V 0.4033V 0.267V
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