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dc1198bbfa
DEMO MANUAL DC1198B-B
QUICK START PROCEDURE
Demonstration circuit DC1198B-B provides a simple way
to evaluate the performance of the LTM4607EV. Please
refer to Figure 1 for the proper measurement equipment
set-up, and follow the procedure below:
1. Place jumpers in the following positions for a typical
12V
OUT
application:
RUN
CLOCK
MODE
START
On
Prog
CCM
SSO
2. With the power off, preset the load to 0A and the V
IN
supply to less than 36V. Next, connect the input power
supply, load and meters, as shown in Figure 1.
3. Turn on the power at the input. The output voltage
should be 12V, ±2%.
4. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, effi ciency
and other parameters. The cooling fan and lower cur-
rent sensing resistor are necessary for V
IN
< 6V and
I
OUT
= 5A.
5. To measure the input and output ripple, please refer
to Figure 2 for the proper set-up.
6. The voltage at PLLFLTR determines the switching
frequency. Modify R6 and R7 to adjust the switching
frequency. Do not allow the voltage at pin PLLFLTR
to exceed 2.4V.
7. Inductor and R
SENSE
should be modifi ed to accom-
modate certain input and output conditions. Please
refer to Table 1 for recommended inductors.
Figure 1. Test Set-Up of the DC1198B-B
INPUT OR OUTPUT CAPACITOR
+
–
Figure 2. Proper Scope Probe Placement for
Measuring Input or Output Ripple
V
IN
DC1198BB F01
0A TO 5A
LOAD
+
–
+
–
+
–
+
–
+
–
