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 

Prev 31 32 33 34 35 36 37 38 39 40 Next

Load transient boost technologyTM

L6713A

13.1

LTB™ gain modification (Optional)

The internal gain can be modified through the SS/LTBG/AMD pin, as shown in the

Figure 13.

The SS/LTBG/AMD pin is also used to set the soft-start time, so the current flowing from

SS/LTBG/AMD pin has to be modified only after the soft-start has been finished.

Using the D diode and R3 resistor (red square in Figure 13), after the soft-start the current

flowing from SS/LTBG/AMD pin versus SGND is zero, so the internal gain is not modified.As

a consequence the LTB™ gain is the default value (LTB™ gain = 2).

To decrease the LTB™ gain it is necessary to use the circuit composed by Q, R1 and R2

(blue square in Figure 13.)

After the soft-start the current flowing from SS/LTBG/AMD pin depends only on R1 resistor,

so reducing the R1 resistor value the LTB™ gain can be reduced. The sum of R1 and R2

resistors have to be selected to have the desiderated soft-start time.

Figure 13. SS/OSC/LTB connections to modify LTB™ gain when using INTEL mode

VPull-Up(1.2V)

SS_END

SS/LTBG/ AMD

D

R3

LTB GAIN=2

RPull-Up(1k)

to SSEND Logic

Q

Rb(10k)

LTB GAIN <2

R1

R2

38/64

Share Link: