DC1320A - Demo Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1320A
HIGH POWER DENSITY STEP-DOWN CONVERTER
LTCC3608/9EWKG
DESCRIPTION
Demonstration circuit 1320A is a high power
density step-down DC/DC converter featuring
LTC3608EWKG/LTC3609EWKG high current,
high input voltage monolithic DC/DC step-down
converter. The input voltage of the demo board
is from 5V to 20V for DC1320A-A with
LTC3608EWKG and 5V to 28V for DC1320A-B
with LTC3609EWKG. The output voltage is
jumper-selectable
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The converter provides the main output with
high efficiency, high power density and fast
transient based on constant on-time valley current mode control.
Table 1.
The converter can be configured for discontinuous or forced continuous operation at light
load. The converter switching frequency is
compensated for variations in Vin and Vout.
The LTC3608/9EWKG is in a compact 7mm X
8mm QFN package.
Design files for this circuit board are available. Call the LTC factory.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Performance Summary (TA = 25°C)
PARAMETER
CONDITION
Input Voltage
Typical
VALUE
5V-20V for DC1320A-A
5V-28V for DC1320A-B
Output Voltage VOUT
IOUT = 0A to 8A
1.5V/1.8V/2.5V/3.3V ± 2%
VIN = 5V-20V (DC1320A-A)
8A
VIN = 5V-28V (DC1320A-B)
8A
Vin=5V-28V , Vout=1.5V/1.8V/2.5V/3.3V, Iout=0-8A
500kHz-700kHz
VIN = 5V, VOUT1 = 1.8V, IOUT1 = 8A
89% Typical
VIN = 12V, VOUT1 = 1.8V, IOUT1 = 8A
87.5% Typical
VIN = 20V, VOUT1 = 1.8V, IOUT1 = 8A
85.5% Typical
VIN = 5V, VOUT2 = 1.8V, IOUT2 = 8A
87.5% Typical
VIN = 12V, VOUT1 = 1.8V, IOUT1 = 8A
83.2% Typical
VIN = 24V, VOUT1 = 1.8V, IOUT1 = 8A
82.2% Typical
Maximum Output Current
Nominal switching frequency
DC1320A-A
Full Load Efficiency
DC1320A-B
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1320A
HIGH POWER DENSITY STEP-DOWN CONVERTER
QUICK START PROCEDURE
Demonstration circuit 1320 is easy to set up
to evaluate the performance of the
LTC3608/9EWKG. Refer to Figure 1 for
proper measurement equipment setup and
follow the procedure below:
ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the Vin or
Vout and GND terminals. See Figure 2 for
proper scope probe technique.
NOTE: When measuring the input or output vol-
tage ripple, care must be taken to avoid a long
NOTE: If there is no output, temporarily dis1. With power off, connect the input power
supply to VIN and GND. Connect the load
between VOUT1, VOUT2 and GND. Preset
the load current at 0A (minimum). Refer to
Figure 1 for correct test set up. The
RUN/SS1 and RUN/SS2 jumpers should be
at “on” position.
2. Turn on the input power.
NOTE: Make sure that the input voltage does
not exceed 20V for A-A and 28V for A-B.
3. Check for the proper output voltages:
Vout=1.8V, +/-2%
connect the load to make sure that the load
is not set too high.
4. Once the proper output voltages are estab-
lished, adjust the loads within the operating
range and observe the output voltage regulation, ripple voltage, efficiency and other
parameters.
5. The output voltage can be programmed to
other voltages 1.5V/2.5V/3.3V by selecting
jumper. The output voltage deviations
should be within +/- 2% of nominal voltages.
6. Typical efficiency curves are shown in Figure 3, Figure 4 and Figure 5.
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1320A
HIGH POWER DENSITY STEP-DOWN CONVERTER
Figure 1. Proper Measurement Equipment Setup
GND
VIN
Figure 2. Measuring Input or Output Ripple
3
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1320A
HIGH POWER DENSITY STEP-DOWN CONVERTER
Figure 3. Typical Supply Efficiency vs Load Current of DC1320A-A at Vin=5V
Figure 4. Typical Supply Efficiency vs Load Current of DC1320A-A at Vin=12V
Figure 5. Typical Supply Efficiency vs Load Current of DC1320A-A at Vin=20V
4
RPG
INTVCC
CIN1
+
[1]
R26
RTH
100pF
CMDHS-3
SDM10K45
VOUT
6A MAX
9V - 32V
-B
CIN1
100uF, 50V
150uF, 35V
JP8
3
2
1
INTVCC
FCB
8A MAX
D1
CCM
DCM
[1]
VOUT
10uF, 50V
10uF, 35V
CIN2, CIN3
0.1uF
C8
[1]
R23
18
17
16
13
12
11
SW 8
1,2,3,4,5,6,7,48,
49,50,51,53, 52
CBst 0.22uF
1500pF 12K
Cth
OPT
OPT
PVIN
CIN7
CIN6
D1
Cthp
VIN
10K
R27
0.1uF
CSS
5V - 20V
[1]
JP7
3
2
1M
R24
OPT
OPT
INTVCC
CIN5
CIN4
-A
INTVCC
OFF
ON
1
CIN3
[1]
RUN/SS
CIN2
[1]
ASSY
E4
E3
100K
E2
J2
J1
E1
[1]
[1]
SGND
PGOOD
VIN-
GND
VIN
VIN+
U1
U1 [1]
LTC3608
R30
162K
1%
LTC3609EWKGHV
LTC3608EWKG
ITH
VRNG
PGOOD
VON
RUN/SS
BOOST
SW
PVIN
F CB
19
ION
22
PGN D
40
35.7K
OPT
R26
SVIN
34,35,36,
37,38,39,
L1
VFB
23
29
30
31
32
28
25
24
21
9
4.7 W 1.5uH
L1 [1]
OPT
C12
10
60.4K 1%
(Opt)
R21
13.7K
1%
3.3V
C6
19.1K
1%
JP5
JP4
2.5V
30.1K
1%
R20
R19
1.5V
1.8V
R16
40.2K
1%
JP2
JP3
R29
SVIN
R28
C10 OPT
4.7uF
10V
OPT
COUT4
C9
0.47uF
50V
1
R25
VOUT
VIN
VISAHY
IHLP2525CZ-01
C7
INTVCC
33,41,42,43,
44,45,46,55,
47
SW
R31
OPT
VOUT SELECT
3.3 W 1.0uH
R23
SVIN
INTVCC
INTVCC
NC
NC
NC
NC
NC
SW
EXTVCC
SGN D
27
10,14,15,
20,26,54,
VIN
OPT
COUT3
VOUT
COUT6
22uF
6.3V
COUT2
100uF
6.3V
OPT
C11
COUT1
100uF
6.3V
J6
VOUT
E9
E8
J3
J4
E7
EXTVCC
VO-
GND
VOUT
[1]
VO+
J5
IOSTEP
10m V/A
E10
IOSTEP_CLK
R1
10K
C2
1uF
10V
DYNAMIC LOAD CIRCUIT
0.010
1%
R2
1
C13
Q1
1uF
SUD50N03-09P-E3 10V
COUT5
22uF
6.3V
3
2
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1320A
HIGH POWER DENSITY STEP-DOWN CONVERTER
5
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