background image

2

dc1588af

DEMO MANUAL DC1588A

QUICK START PROCEDURE

Figure 1. Test Setup of DC1588A

Demonstration circuit 1588A is easy to set up to evalu-
ate the performance of the LTM4611EV. Please refer to 
Figure 1 for proper measurement equipment setup and 
follow the procedure below:  

1. Place jumpers in the following positions for a typical 

1.8V

OUT

 application: 

JP4

JP1

JP2

JP3

V

OUT

 SELECT

RUN

MODE/PLLIN

TRACK/SS

1.8V

ON

FCM

SS

2. With power off, connect the input power supply, load 

and meters as shown in Figure 1. Preset the load to 
0A and V

IN

 supply to be 5V. 

3.  Turn on the power supply at the input. The output volt-

age should be 1.8V ± 1.5%. 

4.  Once the proper output voltage is established, adjust the 

load within the operating range and observe the output 
voltage regulation, output voltage ripple, effi ciency and 
other parameters. Output ripple should be measured 
at J5 with a BNC cable. 

5. To perform a load transient test, apply a square-wave 

pulse signal between IOSTEP_CLK and GND pins. The 
pulse amplitude (3V ~ 3.5V) sets the amplitude of load 
current step. The pulse signal should have very small 
duty cycle (<10%) to limit the thermal stress on the 
transient load circuit. The output transient current can 
be monitored at BNC connector J6 (15mV/A).

6.  The LTM4611 can be synchronized to an external clock 

signal. Place the jumper JP2 in the EXTCLK position 
and apply the clock signal on the “CLKIN” (TP17) test 
point.

7. The output of LTM4611 can track another supply. The 

jumper JP3 allows selection of the soft-start or output 
tracking feature. If tracking external voltage is selected, 
the corresponding test point, “TRACK” (TP7), needs to 
be connected to a valid reference voltage signal. 

+

V

IN

1.5V TO 5.5V

A

+

V

+

V

+

A

+

LOAD
0A TO 15A

DC1588A F01

Reviews: