HA17384 datasheet(16/31 Pages) HITACHI

Part #	HA17384

Description	High Speed Current Mode PWM Control IC for Switching Power Supply

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Manufacturer	HITACHI [Hitachi Semiconductor]

Direct Link	http://www.renesas.com/eng

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16 / 31 page

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP

16

A. Control in the case of heavy load

B. Control in the case of light load

VCS

IS

VCS

IS

As the load becomes heavy and the DC output decreases, the current sensing

level is raised as shown in A. above in order to increase the current in the switching

device in each cycle. When the load decreases, inverse control is carried out as

shown in B. above.

Figure 6 Primary Current Control of Transformer in Current Mode (Conceptual Diagram)

Similar Part No. - HA17384

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