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AP3105L

BCD
Part Number AP3105L
Manufacturer BCD
Description High Voltage Green Mode PWM Controller
Published Aug 4, 2014
Detailed Description Application Note 1062 High Voltage Green Mode PWM Controller AP3105 Prepared by Wu Qikun System Engineering Dept. 1. I...
Datasheet PDF File AP3105L PDF File

AP3105L
AP3105L

Overview
Application Note 1062 High Voltage Green Mode PWM Controller AP3105 Prepared by Wu Qikun System Engineering Dept.
1.
Introduction The AP3105 is a low start-up current, current mode PWM controller with green-mode power-saving operation.
Different from AP3103, AP3105 PWM switching frequency at normal operation is fixed at 65kHz dithering with a narrow range.
The difference between AP3103/AP3105 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 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 60mW 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 65kHz 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 combination, 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 Lat...


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