HA17384 Hitachi Semiconductor, HA17384 Datasheet - Page 16

• Manufacturer Part Number: HA17384
• Description: High Speed Current Mode PWM Control IC for Switching Power Supply
• Manufacturer: Hitachi Semiconductor

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
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Figure 6 Primary Current Control of Transformer in Current Mode (Conceptual Diagram)
A. Control in the case of heavy load
B. Control in the case of light load
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.
V
V
I
I
CS
CS
S
S