MAX17036 Maxim Integrated Products, MAX17036 Datasheet - Page 22

• Manufacturer Part Number: MAX17036
• Description: (MAX17030 / MAX17036) 1/2/3-Phase Quick-PWM IMVP-6.5 VID Controllers
• Manufacturer: Maxim Integrated Products

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1/2/3-Phase Quick-PWM
IMVP-6.5 VID Controllers
Figure 4. Current-Sense Methods
where L
rent-sense resistor, R
value, and C
components.
The MAX17030/MAX17036 integrate the difference
between the current-sense voltages and adjust the on-
time of the secondary phase to maintain current bal-
ance. The current balance relies on the accuracy of the
current-sense signals across the current-sense resistor
or inductor DCR. With active current balancing, the cur-
rent mismatch is determined by the current-sense resis-
tor or inductor DCR values and the offset voltage of the
transconductance amplifiers:
22
______________________________________________________________________________________
ESL
is the equivalent series inductance of the cur-
EQ
and R
A) OUTPUT SERIES RESISTOR SENSING
B) LOSSLESS INDUCTOR SENSING
SENSE
EQ
MAX17030
MAX17036
MAX17030
MAX17036
are the time-constant matching
is current-sense resistance
CSN_
CSN_
CSP_
CSP_
DH_
DH_
DL_
DL_
LX_
LX_
Current Balance
N
N
N
N
H
H
L
L
D
C
D
C
L
IN
L
IN
L
R1
INDUCTOR
L
where R
current balance offset specification in the Electrical
Characteristics table.
The worst-case current mismatch occurs immediately
after a load transient due to inductor value mismatches
resulting in different di/dt for the two phases. The time it
takes the current-balance loop to correct the transient
imbalance depends on the mismatch between the
inductor values and switching frequency.
INPUT (V
INPUT (V
FOR THERMAL COMPENSATION:
R2 SHOULD CONSIST OF AN NTC RESISTOR IN
SERIES WITH A STANDARD THIN-FILM RESISTOR
L
SENSE RESISTOR
ESL
R
EQ
R
C
DCR
R2
EQ
IN
IN
)
)
I
SENSE
OS IBAL
R
SENSE
(
C
EQ
= R
)
C
OUT
=
I
LMAIN
CM
C
= R
OUT
R
R
DCR
−
CS
I
=
=
LSEC
CS
C
C
EQ
R1 + R2
L
EQ
R
R2
[
EQ
and V
R1 R2
=
1
=
R
+
V
R
SENSE
L
R
DCR
ESL
1
OS IBAL
]
SENSE
OS(IBAL)
(
)
is the