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参数资料
| 型号： | LSN-1.8/10-D5B |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | SIP-9 |
| 文件页数： | 7/11页 |
| 文件大小： | 361K |
| 代理商： | LSN-1.8/10-D5B |
LSN-10A D5 Models
N O N - I S O L A T E D , 1 0 - 3 3 W S I P D C / D C C O N V E R T E R S
Figure 4.Trim Connections Using Fixed Resistors
Note: Install either a xed trim-up resistor or a xed trim-down resistor
depending upon desired output voltage.
Trim
Down
Trim Up
LOAD
+INPUT
COMMON
+OUTPUT
TRIM
COMMON
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. VO
NOM = nominal output voltage.
5
Output Reverse Conduction
Many DC/DC converters 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),
UP
VO – 1
RT (k
) =
1.296
DOWN
1 – VO
RT
(k
) =
– 1
1.62(VO 0.8)
UP
VO – 1.2
RT (k
) =
1.992
DOWN
1.2 – VO
RT
(k
) =
– 2.37
2.49(VO 0.8)
UP
RT (k
) =
6
DOWN
RT
(k
) =
– 4.99
7.5(VO – 0.8)
UP
VO – VO NOM
RT (k
) =
1.896
DOWN
VO NOM – VO
RT
(k
) =
– 4.99
2.37(VO – 0.8)
LSN-1/10-D5
Model
LSN-3.3/10-D5
LSN-1.2/10-D5
LSN-1.5/10-D5
LSN-1.8/10-D5
LSN-2/10-D5
LSN-2.5/10-D5
Trim Equations
Output Voltage Trimming
Allowable trim ranges for each model in the LSN D5 SIP Series are ±10%.
Trimming is accomplished with either a trimpot or a single xed resistor. The
trimpot should be connected between +Output and Common with its wiper
connected to the Trim pin as shown in Figure 3 below.
A trimpot can be used to determine the value of a single xed resistor
which can then be connected, as shown in Figure 4, 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 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 ±10% adjustment range is not recommended.
Output Overvoltage Protection
LSN D5 SIP Series DC/DC converters do not incorporate output overvoltage
protection. In the extremely rare situation in which the device’s feedback loop
is broken, the output voltage may run to excessively high levels (VOUT = VIN).
If it is absolutely imperative that you protect your load against any and all
possible overvoltage situations, voltage limiting circuitry must be provided
external to the power converter.
Output Overcurrent Detection
Overloading the output of a power converter for an extended period of
time will invariably cause internal component temperatures to exceed their
maximum ratings and eventually lead to component failure. High-current-
carrying components such as inductors, FET's and diodes are at the highest
risk. LSN D5 SIP Series DC/DC converters incorporate an output overcurrent
detection and shutdown function that serves to protect both the power
converter and its load.
If the output current exceeds it maximum rating by typically 70% (17 Amps) or
if the output voltage drops to less than 98% of it original value, the LSN D5's
internal overcurrent-detection circuitry immediately turns off the converter,
which then goes into a "hiccup" mode. While hiccupping, the converter will
continuously attempt to restart itself, go into overcurrent, and then shut down.
Under these conditions, the average output current will be approximately
400mA, and the average input current will be approximately 70mA. Once the
output short is removed, the converter will automatically restart itself.
Figure 2a. Inverting On/Off Control Pin Signal and Power-Up Sequencing
+INPUT
COMMON
5k
1.1k
2k
0.75k
ON/OFF
CONTROL
For a controlled start-up of one or more LSN-D5's, or if several output volt-
ages need to be powered-up in a given sequence, the On/Off Control pin can
be pulled high (external pull-up resistor, converter disabled) and then driven
low with an external open collector device to enable the converter.
Figure 3.Trim Connections Using a Trimpot
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LSN1810D5J | 制造商:Datel 功能描述: |
| LSN1A | 功能描述:限位开关 HDLS Plug-in Side Rotary RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN1A-1B | 功能描述:限位开关 LIMIT SWITCH RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN1A-3A | 功能描述:限位开关 LIMIT SWITCH RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
| LSN1A-3D | 功能描述:限位开关 LIMIT SWITCH RoHS:否 制造商:Honeywell 触点形式:SPDT 执行器:Non-Contact 电流额定值:30 mA 电压额定值 AC: 电压额定值 DC:3.6 V 工作力:10 g IP 等级:IP 67 NEMA 额定值:1, 4, 12, 13 端接类型:4-Pin M12 Connector 安装:SMD/SMT |
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