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TPS61085DGKTG4 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce TPS61085DGKTG4
Description  650 kHz/1.2 MHz, 18.5 V STEP-UP DC-DC CONVERTER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS61085DGKTG4 Fiches technique(HTML) 11 Page - Texas Instruments

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Setting the Output Voltage
2
18
70
Vref
R
k
A
m
=
»
W
1
2
1
S
V
R
R
Vref
æ
ö
=
´
-
ç
÷
è
ø
(2)
Compensation (COMP)
IN
S
COMP
125 × V
× V × Cout
R
=
L × Iout_max
S
COMP
COMP
V × Cout
C
=
5 × Iout_max × R
(3)
Input Capacitor Selection
TPS61085
www.ti.com ...................................................................................................................................................................................................... SLVS859 – JUNE 2008
The output voltage is set by an external resistor divider. Typically, a minimum current of 50
µA flowing through
the feedback divider gives good accuracy and noise covering. A standard low side resistor of 18 k
Ω is typically
selected. The resistors are then calculated as:
The regulator loop can be compensated by adjusting the external components connected to the COMP pin. The
COMP pin is the output of the internal transconductance error amplifier. Standard values of RCOMP = 13 kΩ and
CCOMP = 3.3 nF will work for the majority of the applications.
Please refer to Table 3 for dedicated compensation networks giving an improved load transient response. The
following equations can be used to calculate RCOMP and CCOMP:
Table 3. Recommended Compensation Network Values at High/Low Frequency
FREQUENCY
L
VS
VIN ± 20%
RCOMP
CCOMP
5 V
82 k
1.1 nF
15 V
3.3 V
75 k
1.6 nF
5 V
51 k
1.1 nF
High (1.2 MHz)
3.3 µH
12 V
3.3 V
47 k
1.6 nF
5 V
30 k
1.1 nF
9 V
3.3 V
27 k
1.6 nF
5 V
43 k
2.2 nF
15 V
3.3 V
39 k
3.3 nF
5 V
27 k
2.2 nF
Low (650 kHz)
6.8 µH
12 V
3.3 V
24 k
3.3 nF
5 V
15 k
2.2 nF
9 V
3.3 V
13 k
3.3 nF
Table 3 gives conservatives Rcomp and Comp values for certain inductors, input and output voltages providing a
very stable system. For a faster response time, a higher Rcomp value can be used to enlarge the bandwidth, as
well as a slightly lower value of Ccomp to keep enough phase margin. These adjustments should be performed
in parallel with the load transient response monitoring of TPS61085.
For good input voltage filtering low ESR ceramic capacitors are recommended. TPS61085 has an analog input
IN. Therefore, a 1
µF bypass is highly recommended as close as possible to the IC from IN to GND.
One 10
µF ceramic input capacitors are sufficient for most of the applications. For better input voltage filtering
this value can be increased. Refer to Table 4 and typical applications for input capacitor recommendations.
Copyright © 2008, Texas Instruments Incorporated
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