420W LLC quasi-resonant soft amplifier switching power supply board positive and negative voltage ±24v -48v-65v-80v-110v-200v (optional)
Default parameters:
Input: AC200-240V 50/60HZ
Please select clear voltage parameters when shooting. It is normal for the output voltage to jump a little under no-load conditions. This is because the no-load chip works in intermittent power-on mode. I know this situation, because any power amplifier board basically consumes about 10 watts of power in standby. If a dummy load is added, it will not be of any use at all except to satisfy some patients with OCD. It will only increase the heat and reduce the temperature. efficiency!
In addition, when there is no load, there is a certain error in the positive and negative voltages, which is a normal phenomenon. Patients with obsessive-compulsive disorder who are too serious are careful to shoot, because the switching power supply voltage regulation is based on the control of the +VCC path. Compared with -VCC, this path only increases the optocoupler 431. Other components consume power. Because -VCC has no other power consumption, the voltage across the -VCC filter capacitor is a peak virtual power. Although a bleeder resistor is added on the board, it is impossible to target all output voltages. The deviation does not affect the use at all, the reason is this, people who understand it will understand it naturally, don`t take it too seriously! In case you still have obsessive-compulsive disorder after reading this description, please add a bleeder resistor between -VCC and ground, such as 10K 33K, etc., when the experiment decides to add a resistor with a suitable resistance value. Negative voltage until you feel satisfied! To be honest, customers with obsessive-compulsive disorder and long-winded customers are really afraid of encountering such a customer.
Ripple: about 0.3% of the peak value (the coaxial cable should be used for testing the ripple, the shorter the outer ground wire, the smaller the effect, and the test value with the oscilloscope probe will be too large, because the probe ground wire will affect the numerical deviation), according to the ripple If the average value of the wave is about 2/10,000, this indicator is already very beautiful! Replace the bulky ring cow!
Note: The output voltage is a symmetrical voltage. For example, the positive and negative 36V output parameters must have the same load on the positive and negative voltage parts, and must be symmetrical. It is not possible to use only one side. For example, if only the positive 36V and 0V are loaded, this It will cause the power tube to work unilaterally, which will lead to abnormal protection, or even burn out due to heat. Remember! If it must be used as a single voltage, it can only be used between positive 36V and negative 36V. At this time, the voltage difference is 72V. When 72V single voltage is used, the middle 0 point can be used without it, it will not be affected! And so on for other output voltage parameters!
Size: 120.7*81*36mm
Net weight: about 270 grams
As the product is constantly updated and revised, the baby pictures are for reference only! Subject to the real object, please take pictures carefully! In addition, different output voltage parameters may use capacitors and other components of different colors or different withstand voltages and volumes, and the colors of switching transformer tapes are different. Terms!