Performance Summary; Quick Start Procedure - Linear Technology LT3790 Demo Manual

DEMO MANUAL DC2123B

PERFORMANCE SUMMARY

PARAMETER
Minimum Input Voltage, V
PVIN
Maximum Input Voltage, V
PVIN
Maximum Output Current
Input EN Voltage, V
PVIN(EN)
Input UVLO Voltage, V
PVIN(UVLO)
Input OVLO Turn-Off Voltage, V
PVIN(OVLO turn-off)
Input OVLO Turn-On Voltage, V
PVIN(OVLO turn-on)
Output Voltage V
OUT
Efficiency
Switching Frequency
Input Current Limit
Output Current Limit

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
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
Specifications are at T = 25°C
A
CONDITIONS
V = 24V I ≤ 5A
OUT OUT
V = 24V I ≤ 5A
OUT OUT
8V < V < 56V, CTRL = V
PVIN REF
R3 = 88.7k, R4 = 499k, V Rising
PVIN
R3 = 88.7k, R4 = 499k, V Falling
PVIN
R11 = 27.4k, R1 = 499k, V Rising
PVIN
R11 = 27.4k, R1 = 499k, V Falling
PVIN
R19 = 71.5k, R34 = 1.37k, R20 = 3.83k
V = 24V, I = 5A
PVIN OUT
R18 = 147k
RIN1 = 0.0015Ω
RS2 = 0.008Ω
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.
does
IN
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.
MIN TYP MAX UNITS
8
56
5
9.6
8.0
57.6
56.2
23.5 24.5
98
200
33
7.5
dc2123bfa
V
V
A
V
V
V
V
V
%
kHz
A
A