LNK304 based switch mode power supply circuit

12V /120 switch mode power supply circuit

 

The circuit diagram of a practical 12V/120mA transformerless switch mode power supply is shown above. Resistor R1, capacitors C1 and C2, diodes D1 and D2 and inductor L1 forms the input stage. D1 and D2 forms the rectifier section while C1 and C2 are input filters. Resistor R1 which is a fusible resistor limits the inrush current, increases differential mode noise attenuation and also serves as an input safety fuse.

The next stage is the regulator stage which consists of IC LNK304, diodes D3 and D4, capacitors C3, C4 and C5, resistors R3, R4 and R5 and inductor L2. D3 is the freewheeling diode while L2 is the output choke. C5 is the output filter capacitor which limits the output ripple voltage to a value as low as possible. The IC LNK304 is so configured that the power supply operated in the most discontinuous mode and that’s why a fast recovery diode (UF4005) is used as the freewheeling diode (D3). UF4005 has a reverse recovery time of around 75nS and it is well enough for the given situation.

The voltage drop across diodes D3 and D4 are practically same and so the voltage across C4 tracks the output voltage and this voltage is picked by the network comprising of resistors R2, R3 and is fed to the feedback pin. R2 and R3 sets the output voltage and for 12V output the voltage at the feedback pin must be 1.65V DC. The circuit attains regulation by skipping the switching cycles. When the output voltage rise, the current at the feedback pin also rises and when the current rises above the threshold value, subsequent cycles are skipped until the current at the feedback pin goes below the threshold and thus a constant output voltage is maintained.

The IC will auto restart if no cycles are skipped during a 50mS time period and this limits the maximum output power to 6% of the maximum over load power. That’s how over load protection is attained. Resistor R4 serves as a small preload which nullifies the effects of tracking error.

12V/120mA switch mode power supply circuit.

Transformer less switch mode power supplies have become very popular these days. The circuit shown below is of a 12V/120mA output, 85 to 230V AC input transformerless switch mode power supply using LNK304 IC. Applications of a power supply based on this IC includes hand held devices, timers, small appliances, LED drivers, industrial gadgets etc.

LNK304 is a low component count, efficient off-line switcher IC that can support buck, buck-boost and flyback topologies. The IC has a built in auto start circuit for short circuit and open loop fault protection. Other features of LNK304 includes low temperature variation, thermal shut down,high break down voltage, good line & load regulation, high band width , wide input voltage range (85 to 230V AC) etc. In general the LNK304 has a better performance when compared to the many other discrete buck regulators.

 

LNK304 pin configuration and typical application

The pin configuration and the typical application diagram of LNK304 are shown above. Drain (D) pin the drain connection of the built in power MOSFET. The external by pass capacitor (0.1uF) is connected to the BYPASS (BP) terminal. FEEDBACK (FB) pin controls the switching of the built in power MOSFET. A current above than 49uA delivered to this pin will inhibit the switching. The internal power MOSFETs source is connected to the SOURCE (S) pin.

ATX Switching Power Supply

atx-switching-power-supply-big-fan

If you had planned to carry out some graphics using it, it can be very awkward and at wellas discouraging, especially.The good news is that there is a test that can be used to ascertain the operability of an ATX switching power supply.In addition, this test does not require any special tools or no unique technical knowledge. The best part is that the test can be carried out very simple. Read on and learn more.
The first step you need to do in carrying out this test is to use a paperclip to unfold it in order to acquire a U shape.
To access the panel, you will be required to remove the 2 thumb screws attached to it.

• Once you have removed this, you will be able to locate the foremost ATX power connection that is directly linked to the motherboard.

It connects to the right side of the motherboard and is considered to be the largest connection jetting from the ATX switching power-supply to the motherboard.

• Once you are done with the above step, the next thing you ought to do is to ensure that you have oriented the power connector in a way that you will have an opportunity to see the connective points that plug directly into the motherboard. Place the paperclip into the connective point.