Performance Summary; Quick Start Procedure - Analog Devices DC2665B-C Demo Manual

DEMO MANUAL DC2665B-C

PERFORMANCE SUMMARY

PARAMETER
Input Voltage Range
Output Voltage, V
OUT
Maximum Continuous Output Current
Default Operating Frequency
Efficiency

QUICK START PROCEDURE

Demonstration circuit 2665B-C is an easy way to evaluate
the performance of the LTM4657. Refer to Figure 1 for test
setup connections and use the following the procedure.
1. With power off, place the jumpers in the following
positions:
JUMPER POSITION
JP8 JP7
RUN MODE
ON CCM
2. Before connecting the input supply, load, and meters,
preset the input voltage supply between 3.1V to 20V.
Preset the load current to 0A.
3. With the power off, connect the load, input voltage
supply, and meters as shown in Figure 1.
4. Turn on the input power supply. The output voltage
meters for each phase display the ±1.2% programmed
output voltage.
2
Specifications are at T
CONDITIONS
Jumper Selection on JP1
Jumper Selection on JP2
Jumper Selection on JP3
Jumper Selection on JP4
Jumper Selection on JP5
Derating Is Necessary for Certain Operating Conditions
(See Data Sheet for Details)
V = 12V, V = 1V, I = 8A
IN OUT OUT
5. Once the proper output voltage is established, adjust
the load current in the 0A to 8A range and observe
the load regulation, efficiency, and other parameters.
Measure the output voltage ripple across the furthest
output cap with a BNC cable and oscilloscope from J2.
6. Place the MODE pin jumper (JP7) in the DCM position
FUNCTION
to observe increased light load efficiency.
JP1 to JP6
7. For optional load transient testing, an onboard
V Select
OUT
transient circuit is provided to measure transient
1V
response. Place a positive pulse signal between the
IO_STEP_CLK (E10) pin and GND pin. The pulse
amplitude sets the load step current amplitude. Keep
the pulse width short (<1ms) and the pulse duty cycle
low (<15%) to limit the thermal stress on the load
transient circuit. Monitor the load step with a BNC
connected to J1 (5mV/A).
= 25°C
A
MIN
3.1
0.98
1.47
2.45
3.23
4.9
TYP MAX UNITS
20 V
1.0 1.02 V
1.5 1.53 V
2.5 2.55 V
3.3 3.37 V
5.0 5.1 V
8 A
500 kHz
85.8 %
Rev. 0