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Protection features include cycle-bycycle current limit, thermal shutdown, and frequency foldback at short circuit. Bypass this pin to G with a low ESR capacitor. See Input Capacitor in the Application Information section. Connect this pin to the switching end of the inductor.
ACT datasheet & applicatoin notes – Datasheet Archive
The voltage at this pin is regulated to 1. Connect to the resistor divider between output and ground to daatasheet output voltage. See Stability Compensation in the Application Information section. When higher than 1. When lower than 0. Output voltage is discharged when the IC is off.
When left unconnected, EN is pulled up to 4. Do not exceed these limits to prevent damage to the device. Exposure to absolute avt4060 rating conditions for long periods may affect device reliability.
The converter operates as follows: With the SW side of the inductor now connected to IN, the inductor current ramps up to store energy in the magnetic field. The inductor current level is measured by the Current Sense Amplifier and added to avt4060 Oscillator ramp signal.
At this point, the SW side of the inductor swings to a diode voltage below ground, causing the inductor current to decrease and magnetic energy to be transferred to output. This state continues until the cycle starts again. Current limit happens when COMP reaches its maximum clamp value of 2. The Oscillator normally switches at kHz. However, if FB voltage is less than 0. When EN is less than 0. When EN is higher than 1. Note that EN is a low voltage input act4600 a maximum voltage of 6V, it should never be directly connected to IN.
Output Voltage Setting Input Capacitor The input capacitor needs to be carefully selected to maintain sufficiently low ripple at the supply input of the converter.
A low ESR capacitor is highly recommended. Since large current flows in and out of this capacitor during switching, its ESR also affects efficiency.
The input capacitance needs to be higher than 10? The input capacitor should be placed close to the IN and G pins of the IC, with the shortest traces possible.
ACT4060 – Wide Input 2A Step Down Converter
In the case of tantalum or electrolytic types, they can be further away if a small parallel 0. F ceramic capacitor is placed right next to the IC. The output ripple voltage is: This inductor current has a ripple that is dependent on the inductance value: The trade off for high inductance value is the increase in inductor core size and series resistance, and the reduction in current handling capability.
Dtasheet general, select an inductance value L based on ripple current requirement: Make sure that this peak inductor current is less that the 3A current limit. Finally, select the inductor core size so that it does not saturate at 3A. Typical inductor values for various output voltages are shown in Table 1.
In the case of ceramic output capacitors, RESR is very small and does not contribute to the ripple. Therefore, a lower capacitance value can be used for ceramic type.
In the case of tantalum or electrolytic capacitors, datasheeet ripple is dominated by RESR multiplied by the ripple current. In that case, the output capacitor is chosen to have sufficiently low ESR.
(PDF) ACT4060 Datasheet download
For ceramic output capacitor, typically choose a capacitance of about 22? The Schottky diode must have current rating higher than the maximum output current and a reverse voltage rating higher than the maximum input voltage. The DC loop gain of the system is determined by the following equation: Table 2 shows some calculated results based on the compensation method above.
The SP-Cap is based on aluminum electrolytic capacitor technology, but uses a solid polymer electrolyte and has very stable capacitance characteristics in both operating temperature and frequency compared to ceramic, polymer, and low ESR tantalum capacitors.
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