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DESCRIPTION
Demonstration circuit 2407A is a dual channel 42V, 4A
synchronous step-down Silent Switcher
escent current featuring the LT8650S. The LT8650S is the
second-generation Silent Switcher that minimizes EMI
and reduces PCB layout sensitivity. The demonstration
circuit has two outputs: 5V and 3.3V. Each output can
source up to 4A continuous current at the same time.
Figure 1 shows the conducted EMI measurements from
150kHz to 30MHz. Figure 2 shows the radiated EMI mea-
surements from 30MHz to 1GHz. All measurements were
tested per CISPR 25 specifications. The circuit passes the
tests with wide margins.
The SYNC pin on the demo board is grounded by default
for low ripple Burst Mode
to an external clock, move JP2 to FCM W/O SSM OR
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
Input Supply Range
IN
V
Output1 Voltage
OUT1
I
Maximum Output1 Current
OUT1
V
Output2 Voltage
OUT2
I
Maximum Output2 Current
OUT2
f
Switching Frequency
SW
EFE
Efficiency at DC
Arrow.com.
Downloaded from
Dual Channel 42V, 4A Synchronous Step-Down
Silent Switcher with 6.2µA Quiescent Current
with 6.2μA qui-
®
operation. To synchronous
®
CONDITIONS
I
= 4A, I
OUT1
SYNC position and apply the external clock to the SYNC
turret. Moving JP2 to FCM W/SSM enables spread spec-
trum mode.
The demonstration circuit 2407A runs at 2MHz to mini-
mize solution size. The efficiency is 92%. The IC tempera-
ture rise is less than 50°C when both channels run at full
load, 4A each, at 2MHz.
The LT8650S data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 2407A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2407A
L, LT, LTC, LTM, Linear Technology, the Linear logo, Silent Switcher, and Burs Mode are
registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners.
Specifications are at T
= 25°C
A
= 4A, Input Voltage = 12V
OUT2
DEMO MANUAL
DC2407A
MIN
TYP
MAX
5.4
42
4.8
5
5.2
4
3.168
3.3
3.432
4
1.85
2
2.15
92
LT8650S
UNITS
V
V
A
V
A
MHz
%
dc2407af
1
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Table of Contents
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Related Manuals for Linear Technology LT8650S
Summary of Contents for Linear Technology LT8650S
- Page 1 ® to an external clock, move JP2 to FCM W/O SSM OR L, LT, LTC, LTM, Linear Technology, the Linear logo, Silent Switcher, and Burs Mode are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.
-
Page 2: Typical Performance Characteristics
DEMO MANUAL DC2407A TYPICAL PERFORMANCE CHARACTERISTICS –10 –20 SPREAD SPECTRUM MODE –30 FIXED FREQUENCY MODE –40 FREQUENCY (MHz) DC2407A DEMO BOARD DC2407 F01 (WITH EMI FILTER INSTALLED) 12V INPUT TO 5V OUTPUT1 AT 4A AND 3.3V OUTPUT2 AT 4A, f = 2MHz Figure 1. -
Page 3: Quick Start Procedure
Demonstration circuit 2407A is easy to set up to evaluate 2. With power off, connect the loads to V and GND OUT1 the performance of the LT8650S. Refer to Figure 3 and and V and GND. OUT2 Figure 4 for proper measurement equipment setup and 3. -
Page 4: Parts List
DEMO MANUAL DC2407A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C4 CAP ., 10μF, X5R, 50V, 10%, 1206 MURATA, GRM31CR61H106KA12L C9, C10 CAP ., 4.7pF, C0G, 50V, ±0.25pF, 0603 MURATA, GRM1885C1H4R7CA01D C11, C14 CAP ., 4.7μF, X5R, 25V, 10%, 0603 MURATA, GRM188R61E475KE11D C12, C13, C33, C38 CAP ., 47μF, X6S, 10V, 10%, 1206... -
Page 5: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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