AP3105NA Datasheet High Voltage Green Mode Pwm Controller

Manufacturer: BCD

Overview: Application Note 1096 High Voltage Green Mode PWM Controller AP3105NA/NV/NL/NR Prepared by Wu Qikun System Engineering Dept. 1. Introduction The AP3105NX is a low start-up current, current mode PWM controller with green-mode power-saving operation. Different from AP3103, AP3105NX’s PWM switching frequency at normal operation is fixed at 65kHz dithering with a narrow range. The difference between AP3103 and AP3105NX is shown in Table 1. The dithering of frequency will improve EMI 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 20kHz frequency switching is to avoid the audible noise as well as to reduce 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 AP3105NX can be reduced to 60mW at 230V input. AP3103 Frequency VFB Resistor Standby Performance External Protection VCC OVP Adjustable 4.5kΩ Better NA Auto-recoverable Auto-recoverable AP3105NX Fixed at 65kHz 10kΩ Best By “CTRL” pin Latch /Auto-recoverable Latch /Auto-recoverable This application note includes detailed explanation of the IC’s major functions, some considerations about the PCB layout, and methods for reducing the standby power loss, and finally presents a demo design of a 12V 2A adaptor. 2.

Datasheet Details

Part number	AP3105NA
Manufacturer	BCD
File Size	383.42 KB
Description	High Voltage Green Mode PWM Controller
Datasheet	AP3105NA-BCD.pdf

General 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 voltage is 2.5V.

Key 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 add external protection functions such as OVP and OTP. The AP3105NX is specially designed for off-line AC-DC power supply, such as LCD monitors, notebook adapters and battery charger.

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