L6714 datasheet(49/70 Pages) STMICROELECTRONICS

部件名	L6714

功能描述	4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs

PDF	70 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

49 / 70 page

L6714

Maximum Duty-cycle limitation

49/70

Maximum Duty-cycle limitation

The device limits the maximum duty cycle and this value is not fixed but it depends on the

delivered current given by the following relationship:

From the previous relationships the maximum duty cycle results:

If the desired output characteristic crosses the limited-DMAX maximum output voltage, the

output resulting voltage will start to drop after the cross-point. In this case the output voltage

starts to decrease following the resulting characteristic (dotted in Figure 19) until UVP is

detected or anyway until IDROOP=140µA.

Figure 19.

Maximum Duty-Cycle (left) and limited DMAX output voltage (right)

max

()

0.80

DROOP

2.857k

()

–

0.80

SENSE

---------------------

OUT

2.857k

⎝⎠

⎛⎞

–

max

()

80%

DROOP

µA

40%

DROOP

140

µA

⎩

⎨

⎧

DMAX

40 %

Maximum Duty Cycle

80 %

IDROOP = 140µA

(IOCP = N x IOCPx )

IDROOP

VOUT

0.40 VIN

Limited DMAX Output Voltage

0.80 VIN

IOCP = N x IOCPx

(IDROOP = 140µA)

IOUT

Desired output Char.

UVP Threshold

Resulting Output Char.

Limted-DMAX Output Char.

L6714 数据表(PDF) 49 Page - STMicroelectronics

L6714 数据表(HTML) 49 Page - STMicroelectronics

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