l6730cqtr STMicroelectronics, l6730cqtr Datasheet - Page 23

• Manufacturer Part Number: l6730cqtr
• Description: Adjustable Step-down Controller With Synchronous Rectification
• Manufacturer: STMicroelectronics

L6730C - L6730D
Figure 16. Constant current and Hiccup Mode during an OCP (L6730C).
Figure 17. Peak overcurrent-protection in constant-current-protection (L6730D).
V
I
L
OUT
Using the L6730D there is the possibility to set the constant-current-protection also after the
soft-start. The following figures show the behaviour of the L6730D during an overcurrent event.
Figure 17.
when the current exceeds the OCP threshold. In this way the duty-cycle is reduced, the V
reduced and so the maximum current can be fixed even if the output current is escalating.
Figure 18.
time and, if the output current continues to increase, the maximum current can increase too.
Notice how the Vout remains constant even if the output current increases because the on-time
cannot be reduced anymore.
I
OUT
shows the intervention of the peak OCP: the high-side MOSFET(s) is turned-off
shows the limit of this protection: the on-time can be reduced only to the masking
Peak th
T
ON
VSS
Device description
VCOMP
I
L
OUT
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