L6713ATR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6713ATR

2/3 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs

STMicroelectronics 

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Soft-start

L6713A

16.3

Low-side-less startup

In order to avoid any kind of negative undershoot on the load side during start-up, L6713A

performs a special sequence in enabling LS driver to switch: during the soft-start phase, the

LS driver results disabled (LS = OFF) until the HS starts to switch. This avoid the dangerous

negative spike on the output voltage that can happen if starting over a pre-biased output

(See Figure 21).

This particular feature of the device masks the LS turn-ON only from the control loop point of

view: protections are still allowed to turn-ON the LS MOSFET in case of over voltage if

needed.

Figure 21. Low-side-less start-up comparison

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