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DC2041A

P1-P3P4-P6P7-P8
4
dc2041af
DEMO MANUAL DC2041A
sHunt enaBLeD
The DC2041 is easy to set up to evaluate the performance
of the LTC3255 with the shunt enabled. Refer to Figure 3
for proper measurement equipment setup of the LTC3255
with the shunt enabled and follow the evaluation procedure.
NOTE. When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the V
IN
or
V
OUT
and GND terminals. See Figure 2× for proper scope
probe technique.
1. Set the EN jumper, JP1, on the DC2041 board to the
ON position.
2. Set the SHUNT jumper, JP3, to the ON position.
3. Set the V
OUT
jumper, JP2, to the desired output voltage.
NOTE. Do not set the V
OUT
jumper to the OPT setting un-
less the appropriate resistor is installed in R7. The V
OUT
jumper OPT position is to allow an alternate V
OUT
setting.
This can be accomplished by adding a resistor to R7 to
set the output to a desired voltage. Refer to the LTC3255
data sheet to calculate the appropriate value for R7.
4. With power off, connect a 0V
to 48V, 100mA power
supply to a controlled current source, a 250Ω ¼ Watt
resistor, V
IN
and GND with a voltmeter and ammeter
as shown in Figure 3.
5. Turn on the V
IN
input power supply, PS1, and increase
the supply above twice the V
OUT
voltage setting plus
9V. (VPS1 > 2V
OUT
+ 2V + VCS1 + VRS1 + Vammeter).
For example, if V
OUT
is set to 3.3V, set PS1 above
3.3V • 2 + 9V or 15.6V.
NOTE. Make sure that the input voltages do not exceed 60V.
6. Turn on and set the input current source to 4mA. Ob
-
serve the voltage across the V
IN
and GND terminals
and across the V
OUT
and GND terminals. The output
ripple may also be observed using an oscilloscope
with the probe connected as shown in Figure 2.
7. Increase the load on V
OUT
to about 7.4mA and observe
the input current, input voltage and output voltage.
8. Increase the input current source from 4mA to 20mA.
Observe the voltage across the V
IN
and GND terminals
and across the V
OUT
and GND terminals. Adjust PS1
as per equation described in step 5 if needed.
9. Increase the load on V
OUT
to about 38mA and observe
the output voltage. Observe the input
current and input
voltage as the load on V
OUT
is changed.
10. Refer to the LTC3255 data sheet for more details on
how the LTC3255 operates.
11. When done, turn off all loads and power supplies.
5
dc2041af
DEMO MANUAL DC2041A
sHunt enaBLeD
+
–
+
–
+
–
CS1
4mA TO 20mA
CURRENT SOURCE
–+
PS1 SUPPLY
V > (2V
OUT
+24V)
+ VCS1 + VRS1
VMAX = 60V
–+
+
–
–
+
L1
0mA TO
40mA Load
–+
DC2041 F03
Figure 3. Proper Measurement Equipment Setup with Shunt Enabled
6
dc2041af
DEMO MANUAL DC2041A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP CER, 1µF, 25V, X7R 10% 0603 MURATA, GRM188R71E105KA12D
2 1 C2 CAP CER, 1µF, 100V, X7R 10% 0805 TDK, C2012X7S2A105K
3 1 C3 CAP CER, 10µF, 25V, 10% X7R 1206 MURATA, GRM31CR71E106KA12L
4 1 C5 CAP CER, 10pF, 50V, 5% NP0 0402 MURATA, GRM1555C1H100JA01D
5 1 C7 CAP CER, 0.1µF, 16V, 10%, X7R 0402 MURATA, GRM155R71C104KA88D
6 1 R3 RES 1.1M, 1/16W, 1%, 0402 SMD VISHAY, CRCW04021M10FKED
7 1 R4 RES 383kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402383KFKED
8 1 R5 RES 215kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402215KFKED
9 1 R6 RES 133kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402133KFKED
10 1 R8 RES 220kΩ, 1/16W, 5%, 0402 SMD VISHAY, CRCW0402220KJNED
11 2 R12 RES 121kΩ, 1/16W, 1%, 0402 SMD VISHAY, CRCW0402121KFKED
12 1 U1 50mA STEP-DOWN CHARGE PUMP LINEAR TECH., LTC3255EMSE#PBF
Additional Demo Board Circuit Components
13 1 C4 CAP CER 2.2µF, 100V, 10%, X7R 1206 MURATA, GRM31CR72A225KA7
14 0 C6 CAP, 0603 SMD OPT
15 0 C8 CAP, 1206 SMD OPT
16 1 R1 RES 0.0Ω, 1/8W, 0805 SMD VISHAY, CRCW08050000Z0EA
17 2 R2, R10 RES 10kΩ, 1/16W, 5%, 0402 SMD VISHAY, CRCW040210K0JNED
18 0 R7 RES, 0402 SMD OPT
19 2 R9, R11 RES 10.0M, 1/16W, 5%, 0402 SMD VISHAY, CRCW040210M0JNED
20 0 R13, R14, R15 RES, 0805 SMD OPT
Hardware:
For Demo Board Only
21 4 E1, E2, E3, E4 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0
22 4 E5, E6, E7, E8 TURRET, 0.061 DIA MILL-MAX, 2308-2-00-80-00-00-07-0
23 2 JP1, JP3 HEADER, 3 PIN, 1 ROW .079CC SAMTEC, TMM-103-02-L-S
24 3 JP1-JP3 SHUNT, 2mm SAMTEC, 2SN-KB-G
25 1 JP2
HEADER, 2.0mm, 2 × 5
SAMTEC, TMM-105-02-L-D
26 4 MH1-MH4 STAND-OFF, NYLON 0.375" TALL EYSTONE, 8832 (SNAP ON)
P1-P3P4-P6P7-P8

DC2041A

Mfr. #:
Buy DC2041A
Manufacturer:
Analog Devices Inc.
Description:
Power Management IC Development Tools LTC3255EMSE Demo Board I Wide VIN Range
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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