Performance Summary; Quick Start Procedure - Analog Devices DC3103A Manual

DEMO MANUAL DC3103A

PERFORMANCE SUMMARY

PARAMETER
Input Voltage PV Range
IN
Input Voltage PV Range (Full Power)
IN
Switching Frequency (f )
SW
Spread Spectrum (SSFM) Range
Output Voltage V
OUT
Typical Efficiency
Peak Switch Current Limit
PV Undervoltage Lockout (UVLO) Falling
IN
PV Enable Turn-On (EN) Rising
IN
PV Quiescent Current
IN

QUICK START PROCEDURE

Demonstration circuit DC3103A is easy to set up to evaluate
the performance of the LT3942. Follow the procedure below.
1. With power off, connect a load capable of 12V 1A
operation between the VOUT and GND turrets on the
PCB as shown in Figure 1.
2. Connect the EN/UVLO turret to GND.
3. Set JP1 to NO SSFM/SYNC to run without SSFM.
4. With power off, connect an input power supply to the
PV and GND turrets. Make sure that the DC input
IN
voltage will not exceed 40V.
2
CONDITIONS
Operating
V = 12V, I = 1A
OUT OUT
R4 = 14.3kΩ, JP1 = NO SSFM/SYNC
R4 = 14.3kΩ, JP1 = SSFM
R2 = 110kΩ, R3 = 10kΩ
PV = 12V, V = 12V, I
IN OUT
JP1 = NO SSFM/SYNC
R7 = 402kΩ, R12 = 324kΩ
R7 = 402kΩ, R12 = 324kΩ
V = 0.3V, V
EN/UVLO OUT
V = 1.3V, V
EN/UVLO OUT
Figure 1. . Test Procedure Setup Drawing for DC3103A
= 1A, f = 2MHz
OUT SW
= 12V
= 12V, Not Switching
5. Turn the input power supply on and adjust the voltage
between 7V and 36V for full output power capability
and accurate 12V output regulation. Below 7V, output
power capability is reduced.
6. Release the EN/UVLO-to-GND connection.
7. Observe the load running at the programmed output
voltage.
8. To enable spread spectrum frequency modulation, set
JP1 to SSFM ON.
MIN TYP MAX
3 36
7 36
2.0
2.0 2.5
12
89
2.2 2.5 2.8
3.0
4.0
0.9 2
2.6 4
UNITS
V
V
MHz
MHz
V
%
A
V
V
µA
mA
Rev. 0