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MP2639A Datasheet(PDF) 28 Page - Monolithic Power Systems

Part # MP2639A
Description  2-Cell Li-Ion or Li-Polymer Switching Charger Compatible with 5V Input and Integrated, Bidirectional Charge/Discharge
PDF  35 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2639A Datasheet(HTML) 28 Page - Monolithic Power Systems

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MP2639A
– SWITCH-MODE BATTERY CHARGER W/ BIDIRECTIONAL OPERATION
MP2639A Rev. 1.0
www.MonolithicPower.com
28
6/6/2017
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
Discharge Line Drop Compensation
The MP2639A integrates a discharge line
compensation function to compensate for the
voltage
drop
across
the
USB
cable
automatically.
The output voltage is compensated by feeding
the
output
current
to
the
top
feedback
resistance (R1) (see Figure 15).
10M
10pF
Rx
R1
R2
VOUT
VIOUT (Final Voltage Signal)
FB
RTRACE1
RTRACE2
RLoad
RTRACE = RTRACE1+RTRACE2
COMP
IOUT (Real Output Current)
Sensing
Gain KSNS
Figure 15: Block Diagram of Line Drop Compensation
If the trace to the load is long, there is a voltage
drop between VOUT and VLOAD. The voltage at
the output terminator (VOUT) is not equal to the
voltage at the load (VLOAD). The voltage drop is
described in Equation (9):
TRACE
OUT
OUT
LOAD
R
I
V
V
(9)
Where RTRACE is the resistance of the cable.
To maintain an accurate and constant load
voltage, output line drop compensation is
necessary.
The
MP2639A
offers
a
compensation method by adjusting the FB
voltage (VFB) slightly according to the load
current. The relation between VOUT and VFB is
described in Equation (10):
Rx
V
2
R
V
1
R
V
V
OUT
I
FB
FB
OUT
(10)
Where VIOUT is the voltage signal representing
the real output current.
The output voltage after compensation is shown
in Equation (11):
1
R
Rx
K
I
V
2
R
2
R
1
R
V
SNS
OUT
FB
OUT
(11)
Ensure that VLOAD is always equal to the output
setting voltage with Equation (12):
LOAD
FB
R1 R2
VV
R2

(12)
To solve Equation (11) and Equation (12), use
the value calculated from Equation (13):
TRACE
OUT
SNS
OUT
R
I
1
R
Rx
K
I
(13)
Given a tested RTRACE, R1 should be selected
according Equation (14):
SNS
T RACE
K
Rx
R
1
R
(14)
Where RX is 150kΩ, and KSNS is 0.3. In practice,
RTRACE ranges from 120 - 200mΩ.



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