First, PT4115 application features
1. The larger the inductance and the lower the operating frequency, the better the constant current effect.
2. The larger the output current, the smaller the inductor value is needed, and the inductor selection is convenient.
3. The higher the output voltage, the higher the efficiency. The 5 1W series is more efficient than the 1 5W.
4. Generally, the larger the inductance, the smaller the switching loss of the power switch, but the DCR will become larger, and the corresponding inductance loss will become larger.
5. The feedback voltage is 1 00mY, the loss is the smallest in the industry, and the power switch is energized and damped.
6. For 0.6Q, it is also relatively small, and the efficiency is higher than the average product.
7. The internal temperature protection function is provided, and the external temperature protection can be designed to protect the LED .
8. In SOT89 -5 package, the thermal resistance is only 45 °C / w, and the heat dissipation characteristics are very good.
Second, PT4115 application circuit
Figure 1 PT4115 application circuit
Third, the circuit working principle analysis
It is AC and DC in the voltage range of 12~24V. VD1～VD4 form a rectifier bridge. This bridge has two functions. If the input is AC power, the AC is rectified into DC; if the input is DC power, the polarity is changed. effect. Regardless of the polarity of the input power supply, the circuit is guaranteed to work properly. CIN is a filter capacitor that converts pulsating DC into a smooth DC. R is the sampling resistor that determines the absolute accuracy of the constant current source. L converts the 100 kHz pulse current into a triangular wave current whose inductance affects the stability of the constant current source over the operating voltage range. VD5 is a freewheeling diode that provides a discharge loop for the current stored in the inductor when the MOS transistor inside the chip is in the off state. Due to the high-frequency pulse state VD5, a Schottky diode with a small forward voltage drop and a fast recovery speed should be used. The DIM end of the chip can be externally connected to PWM pulse or DC voltage dimming, or can be connected to the thermistor for auxiliary temperature control and automatic brightness control. If you do not use these features, the DIM port is left floating.
Permanent magnet Dc Motor is composed of stator magnetic pole, rotor, brush, case and so on. Stator magnetic pole is made of permanent magnet (permanent magnet steel), ferrite, alnico, ndfeb and other materials, and the rotor is generally made of silicon steel laminated. Enameled wire is wound between two slots in the rotor core (three slots are provided with three windings), and its joints are separately welded on the metal sheet of the commutator. Electric brush is a conductive part connecting power supply and rotor winding. Permanent magnet motor brush USES single metal sheet or metallic graphite brush, electrochemical graphite brush.Permanent magnet Gear Motor is established using permanent magnet magnetic field of a dc motor. Permanent magnet gear motor is widely used in various kinds of portable electronic equipment or apparatus
precision instruments and meters,automobile industry, medical equipment, consumer electronics, household appliances, electric glass doors and Windows,etc., wide application range,,Permanent Magnet Gear Motor is usually used in small power occasion.
Features: permanent
magnet gear motor is a kind of rectangular pulse wave, sine wave current, in the form of hybrid permanent magnet motor. Simple structure, high reliability and high efficiency.
Method of use: the best stable in horizontal plane, installed on the permanent magnet gear motor output shaft parts, cannot use a hammer to knock,knock prone to press into the permanent magnet gear motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
permanent magnet gear motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
permanent magnet gear motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of permanent magnet gear motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.
Permanent Magnet Gear Motor,Permanent Magnet Motor With Gear,Permanent Magnet Gear Motor 5V,Permanent Magnet Stepper Gear Motor
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