DC2018A - Demo Manual

DEMO MANUAL DC2018A
LT8330
Low IQ Boost/SEPIC/Inverting
Converter with 1A, 60V Switch
DESCRIPTION
Demonstration circuit 2018A features the LT®8330, a low
IQ boost/SEPIC/inverting converter with a 1A, 60V switch.
The LT8330 allows higher input and output voltages than
comparable converters and also significantly reduces input
current at light loads and no load. The LT8330 regulates
either positive or negative outputs and has an internally
programmed switching frequency of 2MHz.
DC2018A consists of two circuits: one circuit is a boost
converter with an operating input voltage range from 10V
to 36V and an output voltage of 48V. With a 12V input,
the maximum output current for the boost is 135mA and
the efficiency is 89%. The second circuit is an inverting
converter which demonstrates a negative output. The
operating input voltage range of the inverting converter
is from 4V to 36V and the output voltage is –12V. With a
12V input, the maximum output current for the inverting
converter is 270mA and the efficiency is 87%.
For each DC2018A circuit, the output voltage is programmed by resistor divider feedback. The voltage divider
uses high resistance values that minimize current leakage,
and the feedback network also includes a 4.7pF feedforward capacitor. Each DC2018A circuit also uses a low
leakage rectifier diode to further minimize input current
at light loads and no load. The input supply for power to
the inductor can be separated from the LT8330 VIN pin to
allow operation from two input sources.
A resistor divider from the input to the EN/UVLO pin
programs the boost to turn off when the input falls below
9V and the inverting converter to turn off when the input
falls below 3.6V. The position of the EN/UVLO CONTROL
jumper either connects the EN/UVLO pin to the input supply
through a resistor divider, shorts EN/UVLO to ground, or
allows the EN/UVLO pin to be driven directly by a signal
applied to the EN/UVLO terminal. A 50V tantalum polymer
capacitor protects the input from ringing that may occur
when the input is hot-plugged using long leads.
Low input current at light loads, a high voltage rating and
negative output capability make the LT8330 attractive for
battery-powered and extended voltage range regulator
circuits. DC2018A features the LT8330ES6 in a small
6-lead TSOT-23 package. The LT8330 data sheet must
be read in conjunction with this demo manual to properly
use or modify DC2018A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2018A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY – BOOST CONVERTER
PARAMETERS FOR BOOST CONVERTER
CONDITIONS
Specifications are at TA = 25°C
MIN
TYP
MAX
10V
Minimum Input Voltage, VIN
36V
Maximum Input Voltage, VIN
Maximum Output Current, IOUT
VIN = 10V
VIN =12V
VIN = 24V
VIN = 36V
Input EN/UVLO Turn-On Voltage, VIN
R5 =1M 1%, R6 = 215k 1%, VIN Rising
Input EN/UVLO Turn-Off Voltage, VIN
R5 = 1M 1%, R6 = 215k 1%, VIN Falling
Output Voltage, VOUT
R1 = 1M 1%, R2 = 34.8k 1%
Efficiency
VIN =12V, IOUT = 135mA
89%
Switching Frequency
VIN =12V, IOUT = 135mA
2MHz
110mA
135mA
210mA
400mA
9.5V
9.0V
45.8V
49.4V
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DEMO MANUAL DC2018A
PERFORMANCE SUMMARY – INVERTING CONVERTER
PARAMETERS FOR INVERTING CONVERTER
CONDITIONS
MIN
Specifications are at TA = 25°C
TYP
MAX
4
Minimum Input Voltage, VIN
36V
Maximum Input Voltage, VIN
Maximum Output Current, IOUT
VIN = 4V
VIN = 12V
VIN = 24V
VIN = 36V
Input EN/UVLO Turn-On Voltage, VIN
R7 = 1M 1%, R8 = 806k 1%, VIN Rising
3.8V
Input EN/UVLO Turn-Off Voltage, VIN
R7 = 1M 1%, R8 = 806k 1%, VIN Falling
3.6V
170mA
270mA
280mA
280mA
Output Voltage, VOUT
R1 = 1M 1%, R2 = 71.5k 1%
Efficiency
VIN = 12V, IOUT = 270mA
–12.5V
87%
–11.5V
Switching Frequency
VIN = 12V, IOUT = 270mA
2MHz
QUICK START PROCEDURE
To evaluate the performance of the LT8330 using either the
boost or inverting circuits of DC2018A, refer to Figure 1
for the proper measurement equipment setup, the Performance Summary for the maximum output current versus
input voltage and then follow the procedure below.
NOTE: When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple
by touching the probe tip directly across the VIN or VOUT
terminals. See Figure 2 for proper scope probe technique.
1.Make sure the EN/UVLO CONTROL jumper JP1 or JP2
is in the ON position.
2.Connect the EN/UVLO terminal to GND with a clip-on
lead. Connect the power supply (with power off), load,
and meters as shown in Figure 1.
2
3.After all connections are made, turn on the input power
and verify that the input voltage is between 10V and 36V
for the boost or between 4V and 36V for the inverting
circuit.
4.Remove the clip-on lead from EN/UVLO. Verify that
the output voltage is 48V for the boost or –12V for the
inverting circuit.
NOTE: If the output voltage is low, temporarily disconnect the load to make sure that it is not set too high.
Once the proper output voltage is established, adjust
the input voltage and load within the operating ranges
and observe the output voltage regulation, ripple voltage, efficiency and other parameters.
dc2018af
DEMO MANUAL DC2018A
QUICK START PROCEDURE
EQUIPMENT
SETUP FOR
INVERTING
CIRCUIT
EQUIPMENT
SETUP FOR
BOOST
CIRCUIT
DC2018A F01
+
–
–
+
–
+
–
+
–
+
–
–
+
–
+
+
+
–
REMOVABLE
CONNECTION IS
OPTIONAL TO
ASSIST PROPER
STARTUP
48VDC
LOAD
400mA
+
–
+
0V TO 36V
INPUT
SUPPLY
1A
+
–
0V TO 36V
INPUT
SUPPLY
1A
REMOVABLE
CONNECTION IS
OPTIONAL TO
ASSIST PROPER
STARTUP
–
12VDC
LOAD
300mA
Figure 1: Proper Measurement Equipment Setup for DC2018A
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DEMO MANUAL DC2018A
QUICK START PROCEDURE
VIN OR VOUT
GND
100
100
90
90
EFFICIENCY (%)
EFFICIENCY (%)
Figure 2: Proper Scope Probe Technique
80
70
60
50
80
70
60
BOOST: VOUT = 48V
VIN = 12V
0
40
80
120
LOAD CURRENT (mA)
160
50
INVERTING: VOUT = –12V
VIN = 12V
0
60
120
180
240
LOAD CURRENT (mA)
DC2018A F03a
300
DC2018A F03b
Figure 3: VIN = 12V Boost and Inverting Converter Efficiencies
4
dc2018af
DEMO MANUAL DC2018A
QUICK START PROCEDURE
BOOST CONVERTER
VOUT
200mV/DIV
IOUT
50mA/DIV
DC2018A F04
100μs/DIV
Figure 4. Output Voltage Load Transient Response for Boost Converter, VIN = 12V, VOUT = 48V, IOUT = 50mA to 100mA to 50mA
INVERTING CONVERTER
VOUT
200mV/DIV
IOUT
100mA/DIV
DC2018A F05
100μs/DIV
Figure 5. Output Voltage Load Transient Response for Inverting Converter, VIN = 12V, VOUT = –12V, IOUT = 100mA to 200mA to 100mA
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DEMO MANUAL DC2018A
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components – Boost
1
2
C1, C2
CAP., X7R, 4.7μF, 50V, 10% 1206
MURATA, GRM31CR71H475KA12L
2
1
C3
CAP., X5R, 1.0μF, 6.3V, 10% 0402
TDK, C1005X5R0J105K
3
1
C8
CAP., X7R, 4.7pF, 50V, ±0.1pF 0603
MURATA, GRM1885C1H4R7BA01D
4
1
D1
60V, 1A, SCHOTTKY RECTIFIER, SOD323
NXP, PMEG6010CEJ
5
1
L1
INDUCTOR, 6.8μH
WURTH ELEKTRONIK, 74438335068
6
2
R1, R5
RES., CHIP, 1MΩ, 1/10W, 1% 0603
VISHAY, CRCW06031M00FKEA
7
1
R2
RES., CHIP, 34.8k, 1/10W, 1% 0603
VISHAY, CRCW060334K8FKEA
8
1
R6
RES., CHIP, 215k 1/10W, 1% 0603
VISHAY, CRCW0603215KFKEA
9
1
U1
IC., BOOST/INVERTING CONVERTER, TSOT-23
LINEAR TECH., LT8330ES6#PBF
Required Circuit Components – Inverting
1
2
C4, C6
CAP., X7R, 4.7μF, 50V, 10% 1206
MURATA, GRM31CR71H475KA12L
2
1
C7
CAP., X5R, 1.0μF, 6.3V, 10% 0402
TDK, C1005X5R0J105K
3
1
C5
CAP., X7R, 1.0μF, 100V, 10% 1206
MURATA, GRM31CR72A105KA01L
4
1
C9
CAP., X7R, 4.7pF, 50V, ±0.1pF 0603
MURATA, GRM1885C1H4R7BA01D
5
1
D2
60V, 1A, SCHOTTKY RECTIFIER, SOD323
NXP, PMEG6010CEJ
6
1
L2
INDUCTOR, COUPLED, 4.7μH, LPD5030
COILCRAFT, LPD5030-472MEC
7
2
R3, R7
RES., CHIP, 1MΩ, 1/10W, 1% 0603
VISHAY, CRCW06031M00FKEA
8
1
R4
RES., CHIP, 71.5k, 1/10W, 1% 0603
VISHAY, CRCW060371K5FKEA
9
1
R8
RES., CHIP, 806k 1/10W, 1% 0603
VISHAY, CRCW0603806KFKEA
10
1
U2
IC., BOOST/INVERTING CONVERTER, TSOT-23
LINEAR TECH., LT8330ES6#PBF
Optional Demo Circuit Components
1
2
C10, C11
CAP., TANT. POLYMER, 10μF, 50V, 7343
AVX., TCJD106M050R0120
2
2
C12, C13
CAP., X7R, 0.1μF, 50V, 10% 0603
MURATA, GRM188R71H104KA93D
1
10
E1-E10
TESTPOINT, TURRET, 0.094" PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
2
2
JP1, JP2
HEADER, 4-PIN 0.079 SINGLE ROW
SULLINS, NRPN041PAEN-RC
3
2
JP1, JP2
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
Hardware
6
dc2018af
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
E6
E5
E4
E3
E2
ON
GNDB
JP2
EN/UVLO OFF
CONTROL
EXT.
GNDA
4
3
2
4
3
2
1
R7
1M
1. ALL RESISTORS ARE 0603 1%.
NOTE: UNLESS OTHERWISE SPECIFIED
GND
EN/UVLO
VIN
4V - 36V
GND
EN/UVLO
JP1
EN/UVLO
CONTROL OFF
EXT.
ON
R5
1M
50V
7343
C10
+ 10uF
50V
7343
C11
+ 10uF
C4
4.7uF
50V
1206
C3
1uF
6.3V
0402
R8
806K
C7
1uF
6.3V
0402
U2
LT8330ES6
TP4
GND
TP2
R6
215K
5
4
5
C1
GND
4.7uF
TP3
50V
U1
1206
LT8330ES6
4
TP1
2
INTVCC
EN/UVLO
L2A
4.7uH
LPD5030
6
INTVCC
EN/UVLO
VIN
1
3
1206
C5
1uF
3
100V
FBX
1
D1
R2
34.8K
R1
1M
L2B
4.7uH
LPD5030
3
PMEG6010CEJ
D2
4
PMEG6010CEJ
FBX
L1
6.8uH
74438335068
SW
10V - 36V E1
1
SW
6
VIN
2
GND
1
GND
2
VIN
R4
71.5K
R3
1M
C8
4.7pF
0603
50V
C9
4.7pF
0603
50V
*
C2
4.7uF
50V
1206
*
E8
*
GND
BOOST
VOUT
48V
C6
4.7uF
50V
1206
E10
C13
0.1uF
50V
0603
GND
INVERTING
SEE PERFORMANCE SUMMARY
FOR MAX. IOUT VERSUS VIN
VOUT
-12V
*
E9
C12
0.1uF
50V
0603
E7
SEE PERFORMANCE SUMMARY
FOR MAX. IOUT VERSUS VIN
DEMO MANUAL DC2018A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC2018A
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
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engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
8
dc2018af
Linear Technology Corporation
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