MP2497DN datasheet(9/14 Pages) MPS

Part #	MP2497DN

Description	3A, 50V, 100kHz Step-Down Converter with Programmable Output OVP Threshold

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Manufacturer	MPS [Monolithic Power Systems]

Direct Link	http://www.monolithicpower.com

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9 / 14 page

MP2497 – 3A, 50V, 100kHz STEP-DOWN CONVERTER

MP2497 Rev. 1.12

www.MonolithicPower.com

9

12/22/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

APPLICATION INFORMATION

Setting the Output Line Drop Compensation

Figure 2 shows the block of output line drop

compensation.

If the trace to the load is long, there is a voltage

drop between VOUT and VLOAD. VOUT (voltage at

output terminator) is not equal to VLOAD(voltage

at load). The voltage drop can be described by:

DROP

OUT

TRACE

VI

R

=×

(1)

Where, the RTRACE is the resistance of the

output line. (

TRACE

TRACE1

TRACE2

RR

R

=+

)

Then, the VLOAD is:

LOAD

OUT

TRACE

VV

I

R

=−

×

(2)

To keep an accurate and constant load voltage,

the output line drop compensation is necessary.

MP2497 offers a compensation method, by

adjusting the FB voltage slightly according to

the load current.

The relation between VOUT and VFB can be

described by:

OUT

FB

OUT

SENSE

FB

VV

I

R

6

V

R1

R2

400k

−×

×

=+

Ω

(3)

Where, VFB is 0.8V.

Then, the VOUT can be calculated by:

OUT

SENSE

OUT

IR

6 R1

R1

V(1

) 0.8V

R2

400k

×× ×

=+

×

+

Ω

(4)

The VLOAD is determined by:

OUT

SENSE

LOAD

OUT

TRACE

IR

6 R1

R1

V(1

) 0.8V

R2

400k

IR

×× ×

=+

×

+

Ω

−×

(5)

To maintain the VLOAD is not variable with load

current. The equation below should be satisfied:

OUT

SENSE

OUT

TRACE

IR

6 R1

IR

400k

×× ×

=×

Ω

(6)

Simplify the formula above, we can get:

TRACE

SENSE

R

400k

R1

6R

×Ω

=

×

(7)

In the formula above, RSENSE is known. And

RTRACE can be tested or evaluated. So, we can

select a proper top feedback resistor R1

according to the RTRACE and RSENSE to

compensate the output line voltage drop.

SW

ISP

ISN

RSENSE

0.8V

FB

Load

VOUT

VLOAD

ERRPR

AMPLIFIER

R1

R2

600mV

X 6

Hiccup

Current Limit

10000kO

10pF

400kO

Internal Block

RTRACE

RTRACE1

RTRACE2

Figure 2—Output Line Drop Compensation

Setting the Output Voltage

The external resistor divider is used to set the

output voltage (see the typical application circuit

on the front page). The feedback resistor R1 is

decided by output line drop compensation. R2

is then given by:

1

V

8

.

0

V

1

R

2

R

OUT −

=

(8)

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