AP1695-20C

Document number: DS37538 Rev. 1 - 2

11 of 15

www.diodes.com

March 2015

© Diodes Incorporated

AP1695-20C

Fault Protection

Over Voltage Protection and Output Open Protection

VCC

FB

AP1695-20C

Figure 4. OVP Circuit

The output voltage is sensed by the auxiliary winding voltage of the Buck transformer, the VCC pin and FB pin provide over voltage protection

Attention: If the external fast startup circuit is adding in the application and the over voltage protection and output open protection happen, the IC

will trigger latch.

Output Short Protection

will operate in hiccup mode.

Attention: If the external fast startup circuit is adding in the application, the device will not work at UVLO mode, and the device will work at

minimum toff mode.

Over Temperature Protection

AP1695-20C has two kinds of over temperature protection processes. First, the system is operating normally, the ambient temperature is changed

to +170°C suddenly, the IC will trigger over temperature protection which leads to a latch work mode. Second, if the system starts when the

ambient temperature is higher than +150°C, over temperature protection will be triggered. So the AP1695-20C can startup successfully when the

ambient temperature is less than +150°C.

Recommended Applications

The AP1695-20C is a device which internally integrates a MOSFET, the output current is limited by the internal integrated MOSFET, using this

device can cover up to 10W’s application meanwhile the output current is less than 200mA in buck structure.

Components Selection Guide

If the system’s spec is changed, please refer to the design sheet of the AP1695-20C and select the compatible system parameter. When the

system needs to be adjusted slightly, please refer to the table below and adjust the value of the related component.

Item

Description

Related Components

Output current

R8

Output Current Ripple

Small current ripple is good for LED life

C4

System initial on time, used to startup the system

R1

Output Open Voltage

Setting the output voltage when the LED is open

R5, R6

Dimming Performance

Improve the dimming performance

R1, RF, R9, C2, C4

EMI

Pass EN 55022 class B with 6DB margin

L1, C1

Line Compensation

To get a good line regulation

R7