BD550FHG-TR datasheet(8/21 Pages) ROHM

Part #	BD550FHG-TR

Description	AC/DC Controller IC for non-dimmable LED lighting

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Manufacturer	ROHM [Rohm]

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Datasheet

BD550FHG

TSZ02201-0F1F0C300020-1-2

2013.07.25 Rev.001

www.rohm.com

TSZ22111・15・001

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Temparature T[℃ ]

RTt(typ3.7kΩ)

Detect

( 6 ) COMP Pin External Latch Function

IC is latched when the COMP pin voltage goes below VLATCH (0.5V Typ). A latch timer for TLATCH (100us Typ) added to

prevent operation errors caused by noise.

The COMP pin is pulled up by RLATCH (25.9kΩ Typ), and when RT (3.7kΩ Typ) is pulled down at the COMP pin, latch

protection is operated. Some application examples are shown in Figure 10, Figure 11, and Figure 12.

Overheating Protection by NTC Thermistor

A thermistor is attached to the COMP pin so that latching can be stopped when overheating occurs.

In the case of this application, it should be designed so that the thermistor resistance becomes RT (3.70kΩ Typ) when

overheating is detected.

(Figure 10 and Figure 11 are application circuit examples in which latch operation occurs when Ta = 110℃)

The variation in RT (=3.70kΩ Typ) shown in an electrical property includes only IC.

Please add the variation of external thermistor resistance to it and design.

Figure 10, COMP Pin Overheating Protection Application

Figure 11, Temperature-Thermistor Resistance Value

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