INN3166C datasheet(13/33 Pages) POWERINT

13 / 33 page

Rev. J 11/22

InnoSwitch3-CE

www.power.com

Figure 17. Fast AC Reset Configuration.

Recommendations for Circuit Board Layout

See Figure 18 for a recommended circuit board layout for an

InnoSwitch3-CE based power supply.

Single-Point Grounding

Use a single-point ground connection from the input filter capacitor to

the area of copper connected to the SOURCE pins.

Bypass Capacitors

The PRIMARY BYPASS and SECONDARY BYPASS pin capacitor must

be located directly adjacent to the PRIMARY BYPASS-SOURCE and

SECONDARY BYPASS-SECONDARY GROUND pins respectively and

connections to these capacitors should be routed with short traces.

Primary Loop Area

The area of the primary loop that connects the input filter capacitor,

transformer primary and IC should be kept as small as possible.

Primary Clamp Circuit

A clamp is used to limit peak voltage on the DRAIN pin at turn-off.

This can be achieved by using an RCD clamp or a Zener diode

(~200 V) and diode clamp across the primary winding. To reduce

EMI, minimize the loop from the clamp components to the

transformer and IC.

Thermal Considerations

The SOURCE pin is internally connected to the IC lead frame and

provides the main path to remove heat from the device. Therefore

the SOURCE pin should be connected to a copper area underneath

the IC to act not only as a single point ground, but also as a heat

sink. As this area is connected to the quiet source node, it can be

maximized for good heat sinking without compromising EMI

performance. Similarly for the output SR switch, maximize the PCB

area connected to the pins on the package through which heat is

dissipated from the SR switch.

PI-8407-081617

Secondary

Control IC

SR FET

Primary FET

and Controller

VOUT

BPP

100 nF

InnoSwitch3-CE

PI-8403-081617

1N4148

VOUT

BPP

InnoSwitch3-CE

PI-8404-051818

6.2 V

VOUT

BPP

InnoSwitch3-CE

Figure 16. (Top) Line OV Only; (Bottom) Line UV Only.

INN3166C Datasheet(PDF) 13 Page - Power Integrations, Inc.

INN3166C Datasheet(HTML) 13 Page - Power Integrations, Inc.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Datasheet Download

Link URL