2
dc2123bfa
DEMO MANUAL DC2123B
QUICK START PROCEDURE
It is easy to set up demonstration circuit DC2123B to
evaluate the performance of the LT3790. Refer to Figure 1
for the proper measurement equipment setup and follow
the procedure below:
NOTE: Make sure that the voltage applied to PV
IN
does
not exceed the absolute maximum voltage rating of 60V
for the LT3790.
1. Connect the EN/UVLO terminal to ground with a clip-on
lead. Connect the power supply (with power off), load,
and meters as shown.
2. After all connections are made, turn on the input power
and verify that the input voltage is between 8V and 56V.
3. Remove the clip-on lead from EN/UVLO. Verify that the
output voltage is 24V.
NOTE: If the output voltage is low, temporarily disconnect
the load to make sure that it is not set too high.
4. Once the proper output voltage is established, adjust
the input voltage and load within the operating ranges
and observe the output voltage regulation, ripple volt-
age, efficiency and other parameters.
PERFORMANCE SUMMARY
Specifications are at T
A
= 25°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage, V
PVIN
V
OUT
= 24V I
OUT
≤ 5A
8
V
Maximum Input Voltage, V
PVIN
V
OUT
= 24V I
OUT
≤ 5A
56
V
Maximum Output Current
8V < V
PVIN
< 56V, CTRL = V
REF
5
A
Input EN Voltage, V
PVIN(EN)
R3 = 88.7k, R4 = 499k, V
PVIN
Rising
9.6
V
Input UVLO Voltage, V
PVIN(UVLO)
R3 = 88.7k, R4 = 499k, V
PVIN
Falling
8.0
V
Input OVLO Turn-Off Voltage, V
PVIN(OVLO turn-off)
R11 = 27.4k, R1 = 499k, V
PVIN
Rising
57.6
V
Input OVLO Turn-On Voltage, V
PVIN(OVLO turn-on)
R11 = 27.4k, R1 = 499k, V
PVIN
Falling
56.2
V
Output Voltage V
OUT
R19 = 71.5k, R34 = 1.37k, R20 = 3.83k
23.5
24.5
V
Efficiency
V
PVIN
= 24V, I
OUT
= 5A
98
%
Switching Frequency
R18 = 147k
200
kHz
Input Current Limit
RIN1 = 0.0015Ω
33
A
Output Current Limit
RS2 = 0.008Ω
7.5
A
