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Are you experiencing points together with your DC/DC energy provide not beginning up correctly when designing your energy provide programs? On this paper, we are going to type out the issues of the facility provide failing to begin or beginning improperly, analyze the explanations behind them, and supply options.
Frequent start-up failure of DC/DC Converter
The DC/DC energy provide is usually put in on the PCB board after the AC/DC energy provide. After we often design and use it, the primary concern is whether or not the facility provide will be output usually, and the way the load carrying capability. Nonetheless, varied issues typically come up throughout testing. The widespread ones are as follows:
No output after the facility provide is turned on.
The output retains hiccupping after the facility is turned on, and the system can’t work correctly.
When encountering these points, how ought to we analyze, verify, and troubleshoot them? We’ll now analyze every downside individually.
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No Output
There are sometimes a number of causes for “No output” from an influence provide.
1. The enter voltage could also be too excessive or too low
To find out this, use a multimeter to measure the voltage at each ends of the enter terminal and evaluate it to the enter voltage vary within the knowledge sheet (e.g. 9-36V). If the voltage exceeds the desired vary, make the required changes. Present energy to the facility provide inside the enter voltage vary specified within the datasheet.
Fig.1 Enter voltage specs within the datasheet (i.e. 30W DC/DC converter URB_YMD-10WR3)
2. Inadequate DC/DC converter energy
To find out this, calculate the precise energy of the output load and evaluate it with the facility of the front-end energy provide. If the facility of the DC/DC converter isn’t sufficient, contemplate changing it with the next energy one or lowering the load energy.
3. The CTRL operate has a management logic error (for the DC/DC energy module with CTRL pin)
To find out this, verify the management logic of the CTRL pin in its datasheet and take a look at the precise state of the CTRL pin. Whether it is set incorrectly, comply with the directions within the datasheet to design the CTRL pin and make sure that the management logic is appropriate.
Fig. 2: Ctrl data within the datasheet (i.e. 30W DC/DC converter URB_LD-30WR3)
4. Reverse connection of the diode within the peripheral circuit
The output of the DC/DC energy provide is often related to electrolytic capacitors, voltage regulator diodes, and different peripheral units with optimistic and destructive terminals. You will need to keep away from reverse connection because it may end up in irregular output.
To find out if the module has an output, take a look at it individually. If the output of the module is regular however turns into irregular after including the peripheral circuit, verify every peripheral gadget individually. To resolve the problem, appropriate the polarity of the output units. and choose applicable specs.
Moreover, if the chosen peripheral units’ specs don’t meet the precise necessities, it could result in the poor output. Due to this fact, it is usually essential to verify that the gadget’s specs are applicable after ruling out a reverse connection.
Fig. 3: The really helpful peripheral circuit within the datasheet (i.e. 30W DC/DC converter URB_LD-30WR3)
Hiccup Output
Output failure is usually brought on by capacitive hundreds which are too excessive or by load transient energy that exceeds the facility provide specs.
1. Capacitive load exceeds specification
You will need to be aware that modules with completely different output voltages have various capacitive load specs. To find out whether or not the capacitance values of all capacitors on the output facet of the facility provide are inside the specification vary, it’s essential to verify the sum of all capacitance values. To resolve the problem of exceeding the capacitance specification, modify the capacitive load or choose an influence provide that meets the required specs of capacitance load.
Fig. 4: The capacitive load specs within the datasheet (i.e. 10W DC/DC converter URA_YMD-10WR3)
2. Extreme transient energy of the load (e.g. motor, and so forth.)
To check the transient load present on the output facet, use an oscilloscope and evaluate it with the facility provide overcurrent level. If the start-up present exceeds the overcurrent level, then DC/DC energy module can’t start-up usually. To resolve the problem, it is strongly recommended to both select a module with increased energy or add the comfortable begin processing on the load facet to restrict the start-up present.
Fig.5: Check the transient load present on the output facet with an oscilloscope
Abstract
This paper analyses widespread start-up issues encountered when utilizing DC/DC energy provides and presents corresponding affirmation strategies and options to scale back these points throughout the design section. MORNSUN is a producer of energy provide options, providing DC/DC converters, AC/DC converters, enclosed AC/DC SMPS, Din-rail AC/DC SMPS for varied purposes and industries worldwide. MORNSUN presents an entire vary of providers, from product analysis and improvement to mission completion, guaranteeing that prospects obtain an optimum answer that mixes high quality, efficiency, design, supply, and after-sales service.
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