QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1409
1
LTC3788
DESCRIPTION
Demonstration circuit DC1409 is DC/DC boost
converter featuring the LTC3788 constant fre-
quency current mode boost controller. The
DC1409A operates over 5V to 24V input and pro-
vides 8A to 10A of output current at 12V output.
Also, the DC1409A provides a second 24V output
capable of delivering 3A to 5A. The 300kHz con-
stant frequency operation results in small and effi-
cient circuit. The converter provides high output
voltage accuracy (typically ±3%) over wide load
range with no minimum load requirement.
The demonstration circuit can be easily modified
to generate different output voltages. Also, the two
outputs can be connected together to generate
single output with two phase operation. Please
consult LTC factory for details.
The DC1409 has small circuit footprint. It is a high
performance and cost effective solution for Tele-
com, Automotive and Power Over Ethernet appli-
cations.
Design files for this circuit board are available.
Call the LTC factory.
PowerPath is a trademark of Linear Technology Corporation
Table 1.
Performance Summary
PARAMETER
CONDITION
VALUE
Minimum Input Voltage DC1409A-A
IOUT1 = 0A to 3A,
IOUT2 = 0A to 8A
5V
Maximum Input Voltage
IOUT1 = 0A to 5A
IOUT2 = 0A to 10A
24V
VOUT1
VOUT2
VIN = 5V to 24V, IOUT1 = 3A
VIN = 5V to 12V, IOUT2 = 8A
24V ±3%
12V ±3% (see text)
Typical Output Ripple VOUT1
VOUT2
VIN = 6V, IOUT = 3A
VIN = 12V, IOUT = 8A
200mVP–P
200mVP–P
Nominal Switching Frequency
350kHz
QUICK START PROCEDURE
Demonstration circuit DC1409 is easy to set up to
evaluate the performance of the LTC3788. For
proper measurement equipment setup refer to
Figure 1 and follow the procedure below:
NOTE:
When measuring the input or output voltage
ripple, care must be taken to minimize the length
of oscilloscope probe ground lead. Measure the
input or output voltage ripple by connecting the
