Linear Technology DC1052A-A - LTC4218 Demo Board: 12V and 24V, 7.5A Hot Swap Controller with Current Monitoring DC1052A- DC1052A-A Ficha De Dados
Códigos do produto
DC1052A-A
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1029
Multi Channel Power Supply Sequencer and Supervisor
3
QUICK START PROCEDURE
For fast evaluation of LTC2928 performance, the board
contains four low drop out regulators (LDO): LT1761ES-
2.5, LT1761ES-1.5, LT1761ES-1.8, LT1761ES-3.3, and a
push button with control circuitry for ON control signal
generation. LDO outputs are +2.5V, +1.5V, 1.8V, and
+3.3V. Each LDO has an enable input, and works as a
power supply.
contains four low drop out regulators (LDO): LT1761ES-
2.5, LT1761ES-1.5, LT1761ES-1.8, LT1761ES-3.3, and a
push button with control circuitry for ON control signal
generation. LDO outputs are +2.5V, +1.5V, 1.8V, and
+3.3V. Each LDO has an enable input, and works as a
power supply.
Demonstration circuit 1029 is easy to set up to evaluate
the performance of the LTC2928 with the on-board sup-
plies. Refer to the Figure 1 for the proper circuit connec-
tion. For the load resistors R1, R2, R3, and R4 use 51
Ohm 1W resistors. Connect four scope probes to the load
resistors R1, R2, R3, and R4.
the performance of the LTC2928 with the on-board sup-
plies. Refer to the Figure 1 for the proper circuit connec-
tion. For the load resistors R1, R2, R3, and R4 use 51
Ohm 1W resistors. Connect four scope probes to the load
resistors R1, R2, R3, and R4.
Place jumpers in the following positions:
JP1 (OPERATION)
LAST
JP2 (ON)
INT_ON
JP3 (V1)
INT
JP4 (V3)
INT
JP5 (V2)
INT
JP6 (V4)
INT
JP7 (SQT1)
GND
JP8 (VSEL)
ALL POSITIVE
JP9 (RT1 Control)
TIME POSITION
JP10 (SQT2)
GND
JP11 (V1 POLARITY)
V1_POS
JP12 (MS1)
GND
JP13 (RT2 Control)
TIME POSITION
JP14 (OVA CONFIG)
Up
•32%
32%
JP15 (MS2)
GND
JP16 (RT3 Control)
TIME POSITION
JP17 (VIN FOR VCC)
LOW VCC
JP18 (RDIS)
OPEN
JP19 (RT4 Control)
TIME POSITION
1.
With the +5V power supply off, connect the supply to
the 5V_AUX and GND turrets
the 5V_AUX and GND turrets
.
2.
Turn the +5V supply on and then switch the ON control
signal from low to high by pressing the button S1.
signal from low to high by pressing the button S1.
3.
The power-up output voltages should correlate with the
transient shown in Figure 2 (Power-up phase). Accept-
able tolerance in the sequence timing is ±20%.
transient shown in Figure 2 (Power-up phase). Accept-
able tolerance in the sequence timing is ±20%.
4.
Press the button PB (S1) to change the ON signal from
high to low and observe the output voltages. The
power-down output voltages should correlate with the
transient shown in Figure 2. (Power-down phase). Ac-
ceptable tolerance in the sequence timing is ±20%.
high to low and observe the output voltages. The
power-down output voltages should correlate with the
transient shown in Figure 2. (Power-down phase). Ac-
ceptable tolerance in the sequence timing is ±20%.
5.
Turn the +5V power supply off and connect four exter-
nal power supply terminals with DC1029 as shown in
Figure 3. Use external power supplies with output volt-
ages +2.5V, +1.5V, +1.8V, and +3.3V. Leave output
loads as in previous experiments or replace them with
3W resistors 2.5 Ohm. 1.5 Ohm, 2 Ohm, and 3 Ohm
accordingly to have current in each rail around 1A.
nal power supply terminals with DC1029 as shown in
Figure 3. Use external power supplies with output volt-
ages +2.5V, +1.5V, +1.8V, and +3.3V. Leave output
loads as in previous experiments or replace them with
3W resistors 2.5 Ohm. 1.5 Ohm, 2 Ohm, and 3 Ohm
accordingly to have current in each rail around 1A.
6.
Change jumpers V1 (JP3), V2 (JP5), V3 (JP4), and V4
(JP6) positions from INT to EXT.
(JP6) positions from INT to EXT.
7.
Turn all five power supplies on. Pushing the button PB
(S1) changes the ON signal from low to high and after
the power up transient completes, press PB (S1) sec-
ond time to initiate the power down. The output voltage
sequence timing should be similar to the timing with
the internal power supplies.
(S1) changes the ON signal from low to high and after
the power up transient completes, press PB (S1) sec-
ond time to initiate the power down. The output voltage
sequence timing should be similar to the timing with
the internal power supplies.
8.
The DC1029A could be used for the original customer
design. Based on the sequence timing and threshold
parameters define all the optional components’ values,
replace them on the board and verify design perform-
ance. Contact LTC Field Applications Engineers to get
help in designing or verifying your circuit with special
tools.
design. Based on the sequence timing and threshold
parameters define all the optional components’ values,
replace them on the board and verify design perform-
ance. Contact LTC Field Applications Engineers to get
help in designing or verifying your circuit with special
tools.