DC823B-A Linear Technology, DC823B-A Datasheet
DC823B-A
Manufacturer Part Number
DC823B-A
Description
BOARD EVAL LTM4600
Manufacturer
Linear Technology
Series
µModuler
Specifications of DC823B-A
Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
Current - Output
10A
Voltage - Input
4.5 V ~ 20 V
Regulator Topology
Buck
Frequency - Switching
1.35MHz
Board Type
Fully Populated
Utilized Ic / Part
LTM4600
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
DESCRIPTION
Demonstration
LTM
mode step-down power module. The input voltage is
from 4.5V to 20V. The output voltage is programmable
from 0.6V to 5V, refer to step down ratio curve in the
LTM4600 data sheet. The rated load current is 10A,
while de-rating is necessary for different V
thermal conditions. Integrated input and output filters
Table 1. Performance Summary (T
QUICK START PROCEDURE
Demonstration circuit DC823B-A is easy to set up to evaluate the performance of the LTM4600EV. Refer to Figure 3
for proper measurement equipment setup and follow the procedure below:
1.
2.
3.
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
Maximum Continuous Output Current
Efficiency
Load Transient
Place jumpers in the following positions for a typical
1.5V
With power off, connect the input power supply, load,
optional 5V bias supply and meters as shown in Fig-
ure 3. Preset the load to 0A and Vin supply to be less
than 20V. The optional 5V bias supply must be off
while the main Vin is turned off.
Turn on the power at the input. The output voltage
should be 1.5V ± 2%.
®
V
OUT
4600EV, the high efficiency, high density switch
OUT
1.5V
Select
application :
OUT
circuit
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC823B-A
CCM
FCB
DC823B-A
A
= 25°C)
LINEAR TECHNOLOGY CONFIDENTIAL
RUN
ON
features
TEST CONDITION
Selectable with jumpers (open for 0.6Vo)
5-20V
V
V
IN
IN
IN
, V
PRELIMINARY COPY
= 12V, V
= 12V, V
IN
OUT
, 1.5V
, and
OUT
OUT
OUT
the
=1.5V, I
=1.5V
OUT
enable a simple PCB layout. Only bulk input and output
capacitors are needed.
Design files for this circuit board are available. Call
the LTC factory.
LTC, LTM are trademarks of Linear Technology Corporation
4.
5.
Once the proper output voltage is established, adjust
For optional load transient test, apply an adjustable
= 10A
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency
and other parameters. Output voltage ripple should be
measured at J6 with a BNC cable.
pulse signal between IOSTEP CLK and GND pins.
Pulse amplitude sets the current step. The pulse sig-
nal should have very small duty cycle (<15%) to limit
the thermal stress of the transient load circuit. The
output transient current can be monitored at BNC
connector J5 (10mV/A).
HIGH DENSITY POWER MODULE
VALUE
4.5V
20V
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
10 A
82%, See Figure 1
See Figure 2 and Table 1 for details
1
DC
LTM4600EV
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DC823B-A Summary of contents
Page 1
... Maximum Continuous Output Current Efficiency Load Transient QUICK START PROCEDURE Demonstration circuit DC823B-A is easy to set up to evaluate the performance of the LTM4600EV. Refer to Figure 3 for proper measurement equipment setup and follow the procedure below: Place jumpers in the following positions for a typical 1. 1.5V ...
Page 2
... Figure 1. Measured Supply Efficiencies with Different V Figure 2. Measured Load Transient Response (0-10A Step) LINEAR TECHNOLOGY CONFIDENTIAL PRELIMINARY COPY HIGH DENSITY POWER MODULE and V IN OUT 2 ...
Page 3
... Table 1. Output capacitors vs. load transient (0A-5A step) LINEAR TECHNOLOGY CONFIDENTIAL PRELIMINARY COPY HIGH DENSITY POWER MODULE 3 ...
Page 4
... Figure 3. Test Setup of DC823B-A (EXTVCC Vbias Supply is Optional) LINEAR TECHNOLOGY CONFIDENTIAL PRELIMINARY COPY HIGH DENSITY POWER MODULE 4 ...
Page 5
... LINEAR TECHNOLOGY CONFIDENTIAL PRELIMINARY COPY HIGH DENSITY POWER MODULE 5 ...
Page 6
... DC823B-A BOM: LINEAR TECHNOLOGY CONFIDENTIAL PRELIMINARY COPY HIGH DENSITY POWER MODULE 6 ...