MAX16046ETN+CK9 Maxim Integrated, MAX16046ETN+CK9 Datasheet - Page 59

• Manufacturer Part Number: MAX16046ETN+CK9
• Description: Supervisory Circuits 12Ch EEPROM Prob System Manager
• Manufacturer: Maxim Integrated
• Series: MAX16046, MAX16048r

Specifications of MAX16046ETN+CK9

• Rohs: yes

Some applications require filtering of the DAC outputs.
This is especially necessary in applications that require
a large distance between the power supplies to be
margined and the MAX16046/MAX16048, or those that
require immunity to noise. A simple RC filter may be
inserted (see Figure 16).
The calculations change slightly for this configuration.
For DC margining calculations, R
culate the lowpass cutoff frequency, use the following
formula:
Place resistor R
possible to the feedback node.
To connect the MAX16046/MAX16048 to a power sup-
ply using the trim input method, see Figure 17.
Calculate the output voltage, V
where V
ply; R
power supply; R
ing the trim input to the DACOUT_ output; and
V
Figure 15. Connections for Margining Using Feedback Method
DACOUT_
System Managers with Nonvolatile Fault Registers
V
OUT
1
, R
REF
DC-DC OR LDO
=
2
is the output voltage of the DACOUT_ output.
12-Channel/8-Channel EEPROM-Programmable
⎛
⎜
⎝
, R
1
is the reference voltage of the power sup-
V
+
REF
3
R
R
, and R
5
3A
1
2
is an optional series resistor connect-
⎞
⎟
⎠
and the capacitor, C, as close as
⎛
⎜
⎝
OUT
f
FB
R V
=
3 DACOUT_
4
2 R
π
are resistors internal to the
R
R
1
Filtering the DAC Outputs
1
2
3B
R
OUT
C
R
3
3
3
+
, as follows:
= R
R
+
Trim Input Method
4 4
(R
+
3A
4
R
MAX16046
MAX16048
+
5
+ R
R )V
5 REF
V
DACOUT_
3B
. To cal-
⎞
⎟
⎠
Calculate the ratio of R
mula:
Resistors R
may be derived from the formulas given in the DC-DC
converter data sheet where trim input functionality is
discussed. DC-DC module data sheets usually include
trim-up and trim-down formulas in the following form:
where ∆ is the fraction of the total correction.
Another form of trim-up and trim-down formulas may
appear as follows:
Figure 16. DACOUT Filter
TRIM DOWN:R
TRIM UP:R
TRIM DOWN:R
TRIM UP:R
DC-DC OR LDO
ADJ_UP
ADJ_UP
V
3
REF
ADJ_DOWN
ADJ_DOWN
and R
( )
( )
k
⎛
⎜
⎝
OUT
k
Ω
1
FB
Ω
−
+
4
=
⎛
⎜
⎜
⎝
=
R
R
R
⎛
⎜
⎝
⎛
⎜
⎜
⎝
( )
and the reference voltage, V
( )
3
1
2
k
k
V
V
R
R
1
( )
Ω
Ω
OUT_NOM
OUT_NO
1
2
⎞
⎟ =
⎠
k
R
Ω Ω
and R
V
3A
=
=
REF
×
⎛
⎜
⎝
⎛
⎝ ⎜
V
R
100
1
OUT_NOM
3
−
M M
∆
( )
V
∆
2
k
(
+
REF
R
C
Ω
∆
−
V
⎞
⎠ ⎟
using the following for-
(
R
3
REF
1
%
R k
R
3B
⎞
⎟
⎠ ⎠
( )
∆
×
4
3
k
⎛
⎝ ⎜
%
100
Ω
( )
( )
∆
1
k
%
Ω
−
Ω
∆
×
∆
−
(
+
100
−
⎞
⎠ ⎟
(
R
R
R
R k
4
3
4
3
MAX16046
MAX16048
+
( )
( )
( )
( )
k
k
k k
Ω
∆
Ω ∆
Ω
Ω
%
V
)
+ +
)
DACOUT_
−
)
R
⎞
⎟
⎟
⎠
%
R k
3
4
⎞
⎟
⎟
⎠
( )
k
( )
REF
Ω
Ω
59
)
,