AP3105R Datasheet | BCD

feature . When the load decreases, the frequency will reduce and when at a very low load, the IC will enter the “burst mode” to minimize switching loss. A minimum 20k Hz frequency switching is to avoid the audible noise as well as reducing the standby loss. A so-called VCC Maintain Mode is applied under light load to realize a stable output and to reduce the loss on the start-up resistor. The standby power of the system using AP3105 can be reduced to 60m W at 230V input. AP3103 Frequency VFB Resistor Standby Performance External Protection VCC OVP Adjustable 4.5kΩ Better NA Auto-recoverable Auto-recoverable AP3105 Fixed at 65k Hz 10kΩ Best By “CTRL” pin Latch /Auto-recoverable Latch /Auto-recoverable the PCB layout, and methods for reducing the standby power loss, and finally presents a demo design of a 12V 1A adaptor. 2. Function Description 2.1 CTRL Pin For some applications, the system requires external programmable protection function. The CTRL pin has two kinds of modes to trigger the protection: high level trigger and low level trigger. The low threshold voltage is 0.5V and high threshold is 2.5V. When the CTRL pin voltage is lower than 0.5V or higher than 2.5V, latch or auto-restart protection will be triggered (different versions of 3105 offer different protection bination, which is shown in Table 2). Version AP3105 VCC OVP Autorecoverable Latch Latch Autorecoverable OLP& FOCP Autorecoverable Autorecoverable Latch Autorecoverable CTRL(low) Latch Latch Latch Autorecoverable CTRL(high) Autorecoverable Latch Latch Latch AP3105V AP3105L AP3105R Table 2. Version Classification of AP3105 OLP & FOCP Table 1. The Difference between AP3103/AP3105 The AP3105 integrates a lot of functions such as the Lead Edge Blanking (LEB) of the current sensing, internal slope pensation and several protection features which include cycle-by-cycle current limit (OCP), fast OCP (FOCP), VCC over voltage protection, OTP, OLP protection. The “CTRL” pin is designed for customers to...