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APPLICATIONS INFORMATION: Continued
In some applications, it may be desirable to
extend the current sense capability of a given
R SEN element (usually the inductor ESR) be-
yond the limit set by the 43mV threshold.
Output Voltage Programming
As shown in Figure 21(A), the voltage divider
connecting to the V FB pin programs the output
voltage according to
A straight forward way to do this would be to
add a resistor R S2 in parallel with C S , creating a
voltage divider with R S . This changes the rela-
V OUT = 1.25( 1 +
R 1
R 2
)
C S = 2
tionship with R S and C S to be
L 1
ESR R S //R S2
where 1.25V is the internal reference voltage.
Select R2 in the range of 10k to 100k, and R1 can
be calculated using
43mV R S + R S2
Using a voltage divider across the inductor, the
new relationship becomes:
I LIM =
ESR R S2
R 1 =
R 2 (V OUT – 1.25)
1.25
To calculate R S2 , the formula becomes
For output voltage less than 1.25V, a simple
circuit shown in Figure 21(B) can be used in
/( I 43mV ESR – 1 )
R S2 = R S
ISP
LIM
ISN
R S2
which V REF is an external voltage reference
greater than 1.25V. For simplicity, use the same
resistor value for R1 and R2, then R3 is deter-
mined as follows,
SWN
R S
L
C S
ESR
V OUT
R 3 =
(V REF – 1.25)R 1
2.5 – V OUT
Figure 20: Current Sensing
V OUT > 1.25V
V REF
R3
V OUT < 1.25V
?
SP6120
V FB
R1
?
SP6120
V FB
R1
A
R2
B
R2
Figures 21(A), a voltage divider connected to the V FB pin programs the output voltageand 21(B), a simple circuit using
one external voltage reference programs the output voltages to less than 1.25V.
Date: 1/21/05
SP6120 Low Voltage, AnyFET TM , Synchronous, Buck Controller
19
? Copyright 2005 Sipex Corporation
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