1
dc2392af
DEMO MANUAL DC2392A
Description
LTC7860
High Voltage Switching
Surge Stopper
Demonstration circuit 2392A is a high efficiency switching
surge stopper featuring the LT C
®
7860. The board operates
from an input range of 7V to 100V, and provides a 7V to
34V output at 0A to 10A. Its output is current limited. A
soft-start feature controls output voltage slew rate at start-
up, reducing current surge and voltage overshoot. The
demonstration board includes an optional reverse polarity
protection MOSFET and has options for an input filter and
diode to attenuate spikes. For a lower output voltage limit
of less than 12V, there is an optional feedback circuit.
The LTC7860 high efficiency surge stopper protects loads
from high voltage transients. High efficiency compared to
linear circuits permits higher currents and smaller solution
sizes. During an input overvoltage event, such as a load
dump in vehicles, the LTC7860 controls the gate of an
external MOSFET to act as a switching DC/DC regulator
(PROTECTIVE PWM mode). This operation regulates the
output voltage to a safe level, allowing the loads to oper-
ate through the input overvoltage event. During normal
operation (SWITCHON mode), the LTC7860 turns on the
external MOSFET continuously, passing the input voltage
through to the output. An internal comparator limits the 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
voltage across the current sense resistor and regulates the
maximum output current to protect against overcurrent
faults. An adjustable timer limits the time that the LTC7860
can spend in overvoltage or overcurrent regulation. When
the timer expires, the external MOSFET is turned off until
the LTC7860 restarts after a cool down period. By strictly
limiting the time in PROTECTIVE PWM mode when the
power loss is higher, the components and thermal design
can be optimized for normal operation and safely oper-
ate through high voltage input surges and/or overcurrent
faults. This demo board takes advantage of the LTC7860’s
VIN-centric PMOS architecture to float the control ground
allowing operation beyond the controller’s 60V rating.
This board is suitable for a wide range of automotive,
military, telecom, industrial, and other applications. The
LTC7860 is available in a small 12-pin thermally enhanced
MSOP package. For other output requirements, see the
LTC7860 data sheet or contact the LTC factory.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2392A
Specifications are at TA = 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range Normal Operation 7 32 V
500ms Ride-Through 7 100 V
DC Survival 0 100 V
VOUT Output Voltage 7 28 35 V
IOUT Output Current Range, continuous Free Air 0 10 A
ILIMIT Current Limit VIN = 28V 13 A
ILIMIT Current Limit VIN = 40V 10.5 A
VIN-VOUT Insertion Loss VIN = 28V, IOUT = 10A 400 mV
FSW Switching (Clock) Frequency 350 kHz
TPWM PROTECTIVE PWM Mode Time Limit VIN > 35V 0.85 1.06 1.24 s
VOUT P-P Output Ripple VIN = 40V, VOUT = 17.2V, IOUT = 5A (20MHz BW) 100 mVP–P
Approximate Size Component Area x Top Component Height 35 × 42 × 10 mm
2
dc2392af
DEMO MANUAL DC2392A
Quick start proceDure
Demonstration circuit 2392 is easy to set up to evaluate
the performance of the LTC7860. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
NOTE: When measuring the output voltage ripple, care must
be taken to avoid a long ground lead on the oscilloscope
probe. Measure the output voltage ripple by touching the
probe tip and ground ring directly across the last output
capacitor as shown in Figure 1.
1. Set an input power supply that is capable of 7V to
100V to 10V. Then turn off the supply.
2. With power off, connect the supply to the input termi-
nals +VIN and –VIN.
a. Input Voltages lower than 7V can keep the converter
from turning on due to the undervoltage lockout feature
of the LTC7860.
b. A voltmeter with a capability of measuring at least 100V
can be placed across the input terminals in order to
get an accurate input voltage measurement.
3. Turn on the power at the input.
NOTE: Make sure that the input voltage never exceeds
100V.
4. Check for the proper output voltage of 10V. Turn off
the power at the input.
5. Once the proper output voltage is established, connect
a variable load capable of sinking 10A at 34V to the
output terminals +VOUT and –VOUT. Set the current for
0A.
a. A Voltmeter with a capability of measuring at least 36V
can be placed across the output terminals in order to
get an accurate output voltage measurement.
6. Turn on the power at the input.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
7. Once the proper output voltage is again established,
adjust the load and/or input within the operating range
up to 33VIN and observe the output voltage and other
desired parameters.
8. Now apply an input between 35V and 100V and ob-
serve the output voltage and fault timer operation.
9. If desired, you may apply input transient profiles in
the range of 0VIN to 100VIN and observe the output
to illustrate operation of the circuit to prevent input
surges from reaching the output.
10. The output limit voltage can be set in accordance
with the feedback notes on the schematic. The first
line shows the complete formula. The second line is
simplified for the use of a 2:1 divider as shown on the
schematic.
3
dc2392af
DEMO MANUAL DC2392A
Quick start proceDure
Figure 1. Proper Measurement Equipment Setup
4
dc2392af
DEMO MANUAL DC2392A
Quick start proceDure
VIN
VOUT
TIME DC2392A F02
100V
0V
VIN
6
84
86
88
90
EFFICIENCY (%)
POWER DISSIPATION (W)
92
94
100
98
96
0
5
10
15
20
25
40
35
30
10 100
DC2392A F03
5AOUT
10AOUT
10AOUT-PD
Figure 2. Output Response Waveform with 28V to 100V
to 28V Input Surge, (10AOUT) (20V, 20V, 10ms/DIV)
Figure 3. Efficiency and Power Dissipation
5
dc2392af
DEMO MANUAL DC2392A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP., ALUM, 15µF, 100V 8X12 PANASONIC, 100SXV15M
2 4 CIN2, CIN3, CIN4, CIN5 CAP., X7R, 2.2µF, 100V, 10%, 1210 MURATA, GCJ32DR72A225KA01L
3 3 COUT1, COUT2, COUT3 CAP., X7S, 10µF, 50V, 10%, 1210 MURATA, GCM32EC71H106KA01L
4 1 COUT4 CAP., ALUM 150µF 50V 10x10 SUN ELECTRONIC INDUSTRIES CORP., 50CE150AX
5 1 C9 CAP., X7R, 1µF, 50V, 10%, 0805 MURATA, GCM21BR71H105KA01L
6 1 C10 CAP., X7R, 22µF, 10V, 10%, 1206 MURATA, GCM31CR71A226KE01L
7 1 C11 CAP., NPO, 100pF, 50V, 10%, 0603 AVX, 06035A101KAT2A
8 1 C12 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GCM188R71H104KA57D
9 1 C13 CAP., X7R, 0.47µF, 16V, 10%, 0603 MURATA, GCM188R71C474KA55L
10 1 C14 CAP., X7R, 0.1µF, 50V, 10%, 0805 MURATA, GCM21BR71H104KA37L
11 1 C15 CAP., COG, 47pF, 50V, 5%, 0603 MURATA, GCM1885C1H470JA16D
12 1 C17 CAP., COG, 3300pF, 50V, 5%, 0603 MURATA, GCM1885C1H332JA16D
13 1 C18 CAP, 1.5nF, X7R, 50V,10%,0603 AVX, 06035C152KAT2A
14 1 D1 ZENER DIODE, 500mW, SOD123 ON SEMI, SZMMSZ5242BT1G/T3G
15 1 D7 SCHOTTKY DIODE, 100V, 10A, DFN5-SO-8FL ON SEMI, NRVTS10100MFST1G
16 1 D8 SWITCH DIODE, SOD323 ON SEMI., SMMDL914T1G
17 1 L1 INDUCTOR, 10µH COILCRAFT, XAL1010-103ME
18 2 Q1, Q4 FET, P-CHAN.,100V, TO-263 VISHAY, SUM90P10-19L-E3
19 1 Q2 FET, P-CHAN., POWER, TO-252 ON SEMI, SFT1345-TL-H
20 1 Q3 DIODE, IGBT MOSFET 10A, SOT23-6 DIODES INC., ZXGD3005E6TA
21 1 Q6 FET, NPN, SOT23 ON SEMI, SMMBTA42LT1G
22 2 R3, R13 RES., 100k, 1/8W, 1%, 0805 VISHAY, CRCW0805100KFKEA
23 1 R5 RES., 35.7k, 1/10W, 1%, 0603 VISHAY, CRCW060335K7FKEA
24 2 R6, R8 RES., 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA
25 1 R7 RES., 6m, 3W, 1%, 1225 SUSUMU, KRL6432E-M-R006-F-T1
26 1 R9 RES., 1.0k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA
27 1 R16 RES., 10Ω, 1/10W, 5%, 0805 VISHAY, CRCW080510R0JNEA
28 2 R17, R19 RES., 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA
29 2 R24, R26 RES., 31.6k, 1/10W, 1%, 0603 VISHAY, CRCW060331K6FKEA
30 1 R25 RES., 205k, 1/16W, 1%, 0603 VISHAY, CRCW0603205KFKEA
31 1 U1 IC, LTC7860EMSE MSE12 LINEAR TECH.CORP. LTC7860EMSE#PBF
Additional Demo Board Circuit Components
1 0 C1 CAP., OPT 8×12 OPT
2 0 C2, C3, C4, C5, C6, C8 CAP., OPT 1210 OPT
3 0 C7, C16 CAP., OPT 0603 OPT
4 0 D2, D3, D5 ZENER DIODE, OPT SOD123 OPT
5 0 D4 DIODE, OPT, DFN5-SO-8FL OPT
60 D6 ZENER DIODE, OPT, SOD323 OPT
7 0 L2 INDUCTOR, 1µH OPT
8 0 L3 INDUCTOR, 0.6µH OPT
6
dc2392af
DEMO MANUAL DC2392A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
9 0 Q4 HEATSINK, OPT, 573100D00010G OPT
10 0 Q5 OPT, SOT363 OPT
11 0 R1, R2, R29 RES., OPT, 2512 OPT
12 3 R11, R14, R21 RES., 0Ω, 1/16W, 0603 VISHAY, CRCW06030000Z0EA
13 1 R4 RES., 1mΩ, 1%, 1W, 2512 PANASONIC, ERJ-M1WTF1M0U
14 0 R12 RES., OPT, 0805 OPT
15 0 R10, R15, R18, R20,
R22, R23, R27, R28
RES., OPT, 0603 OPT
Hardware: For Demo Board Only
1 6 E1, E2, E3, E4, E5, E6 TESTPOINT, TURRET, .094" MILL MAX, 2501-2-00-80-00-00-07-0
2 5 J1, J2, J3, J4, J5 CONN, BANANA JACK, KEYSTONE 575-4
3 4 MTGS AT 4 CORNERS STAND-OFF, SNAP ON NYLON 0.50" TALL KEYSTONE, 8833(SNAP ON)
7
dc2392af
DEMO MANUAL DC2392A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
100V
3W
16V 50V
50V
10A
XAL1010-103
100V
10Aout,
Limited at 34V
8x12
100V
10X10
50V
DC2392A
GND
GND
VIN1
VOUT
7V - 100V
100SXV15M
50CE150AX
50V
8X12
SW
VIN1
GND
GND
100V
1210
VOUT
CAUTION, SHOCK HAZARD: CONTACT WITH HIGH VOLTAGE
Feedback Notes
V-limit = ( R24 + R26 ) / R26 * ( 0.8V / R19 * R25 + Q6Vbe )
= 2 * ( 0.8 / 10K * 205K + 0.6 ) = 34.0Vnominal
CAN RESULT IN A DANGEROUS ELECTRIC SHOCK.
NOTE: UNLESS OTHERWISE SPECIFIED:
ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603 50V.
7.0V-32.0V
100V
100V, 500ms
NOMINAL INPUT
INPUT DC SURVIVAL
INPUT OPERATING RANGE
28V
SURGE RIDE-THROUGH
OUTPUT VOLTAGE LIMIT 34.0V
150uF 50V Suncon 50CE150AX (10x10mm)
15uF 100V Panasonic 100SXV15M (8x12mm)
2.2uF 100V Murata GCJ32DR72A225KA01L
10uF 50V Murata GCM32EC71H106KA01L
22uF 10V Murata GCM31CR71A226KE01L
10uH Coilcraft XAL1010-103ME
0.006 Susumu KRL6432E-M-R006-F-T1
CAP
FREQ
FREQ
VIN
VOUT
VIN
VIN-10V
VIN-10V
VIN-10V
VIN-10V
VIN-10V
VIN-10V
VIN-10V
VIN-10V
VFB
Q6C CAP
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
DBPRODUCTION2 09-29-15
__
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
DBPRODUCTION2 09-29-15
__
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
DBPRODUCTION2 09-29-15
__
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Tuesday, November 17, 2015
12
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DB
N/A
LTC7860EMSE
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Tuesday, November 17, 2015
12
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DB
N/A
LTC7860EMSE
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Tuesday, November 17, 2015
12
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DB
N/A
LTC7860EMSE
R17
10K
R13
100K
0805
R25
205K
R28
OPT
R12
OPT
0805
Q3
ZXGD3005E6TA
2
3
1
6
4
5
COUT3
U1
LTC7860EMSE
VFB
5
SS
4
SGND
3
FREQ
2
TMR
1
13
PGND
SENSE 10
CAP 9
RUN 8
VFBN 7
ITH
6
VIN 11
GATE 12
R18
OPT
R19
10K
R8
100
R5
35.7K
D2
OPT
C7
OPT
C17
3.3nF
J5
J1
C15
47pF
+
CIN1
15uF
COUT2
J4
C10 22uF
1206
C9
1uF
0805 E4
C11
100pF
R6
100
R10 OPT
E5
D8
SMMDL914
Q4
SUM90P10-19L
D1
SZMMSZ5242B
+
C1
OPT
C16
OPT
R3
100K
0805
Q6
SMMBTA42L
C12 0.1uF
D7
NRVTS10100MFST
CIN4
2.2uF
1210
D6
OPT
D5
OPT
+
COUT4
150uF
E3
COUT1
10uF
Q2
SFT1345
CIN5
2.2uF
1210
CIN3
2.2uF
1210
C18
1.5nF
R11 0
R24
31.6K
R14
0
L1
10uH
C13
0.47uF
J3
R16
10
0805
C8
OPT
1210
CIN2
2.2uF
1210
D3
OPT
R7
6m
1225
R26
31.6K
C14
0.1uF
0805
R21
0
E6
E1
R20
OPT
R9
1K
R15
OPT
8
dc2392af
DEMO MANUAL DC2392A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
OPTIONAL FEEDBACK CIRCUIT
FOR VOUT < 12V
7V - 100V
OPT
REV. POL. PROTECT
OPTIONAL
OPTIONAL INPUT FILTER
PROTECTED )
VIN2
( REVERSE POLARITY
OPT
VIN2
INPUT FILTER
OPTIONAL
VIN
VIN
VIN-10V
VFB
Q6C CAP
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Monday, November 16, 2015
22
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DB
N/A
LTC7860EMSE
DC2392A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Monday, November 16, 2015
22
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DB
N/A
LTC7860EMSE
DC2392A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Monday, November 16, 2015
22
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DB
N/A
LTC7860EMSE
DC2392A
R29
OPT
2512
C2
OPT
1210
C6
OPT
1210
100V
Q5
BC857BS
2
3
16
4
5
C4
OPT
1210
100V
J2
L3
0.6uH
R1
OPT
2512
R22
OPT
C3
OPT
1210
100V
E2
D4
OPT
R27
OPT
C5
OPT
1210
100V
R2
OPT
2512
L2
1uH
R4
1m
2512
R23
OPT
Q1
SUM90P10-19L
9
dc2392af
DEMO MANUAL DC2392A
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.
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
GND
CAUTION, SHOCK HAZARD: CONTACT WITH HIGH VOLTAGE
OPTIONAL REVERSE POLARITY PROTECTION
0805
3W
CAN RESULT IN A DANGEROUS ELECTRIC SHOCK.
DC2392 - Simplified
7V - 100Vin
VIN1
16V
100V
100SXV15M
7V - 100V
GND
10Aout
Limited at 34V
100V
VIN2
100V
50V
50V
10A
VOUT
8x12
50V
50V
0805
12V
0805
FLOATING
GROUND
(INPUT DC SURVIVAL = -100V to +100V)
7.0V-32.0V
100V
100V, 500ms
NOMINAL INPUT
INPUT DC SURVIVAL
INPUT OPERATING RANGE
28V
SURGE RIDE-THROUGH
OUTPUT VOLTAGE LIMIT
34.0V
Feedback Notes
V-limit = ( R24 + R26 ) / R26 * ( 0.8V / R19 * R25 + Q6Vbe )
= 2 * ( 0.8 / 10K * 205K + 0.6 ) = 34.0Vnominal
NOTE: UNLESS OTHERWISE SPECIFIED:
ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603 50V.
150uF 50V Suncon 50CE150AX (10x10mm)
15uF 100V Panasonic 100SXV15M (8x12mm)
2.2uF 100V Murata GCJ32DR72A225KA01L
10uF 50V Murata GCM32EC71H106KA01L
22uF 10V Murata GCM31CR71A226KE01L
10uH Coilcraft XAL1010-103ME
0.006 Susumu KRL6432E-M-R006-F-T1
+VIN
+VIN
CAP
CAP
+VOUT
+VOUT
VIN-10V
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO REV
DAVID B.PROTOTYPE2 09-29-15
__
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO REV
DAVID B.PROTOTYPE2 09-29-15
__
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO REV
DAVID B.PROTOTYPE2 09-29-15
__
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Tuesday, November 17, 2015
11
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DAVID B.
N/A
LTC7860EMSE
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Tuesday, November 17, 2015
11
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DAVID B.
N/A
LTC7860EMSE
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
2
Tuesday, November 17, 2015
11
HIGH VOLTAGE SWITCHING SURGE STOPPER
LT
DAVID B.
N/A
LTC7860EMSE
Q3
ZXGD3005E6TA
+
CIN1
15uF
R3
100K
R26
31.6K
D8
SMMDL914
C13
0.47uF
CIN2,3,4,5
4x2.2uF
1210
C17
3.3nF
R24
31.6K
C18 1.5nF
Q4
SUM90P10-19L
D7
NRVTS10100MFST
C9
1uF
0805
R16
10
U1
LTC7860EMSE
VFB
5
SS
4
SGND
3
FREQ
2
TMR
1
PGND
13
SENSE 10
CAP 9
RUN 8
VFBN 7
ITH
6
VIN 11
GATE 12
R9
1K
R8
100
R13
100K
R6
100
Q6
SMMBTA42L
C15 47pF
C12 0.1uF
R25
205K
COUT1,2,3
3x10uF
1210
R17
10K
C14
0.1uF
0805
+
COUT4
150uF
Q1
SUM90P10-19L
R19
10K
L1
10uH
R7
0.006
1225
J4
Q2
SFT1345
R5
35.7K
D1
SZMMSZ5242B
C11
100pF
C10 22uF
10V
10
dc2392af
DEMO MANUAL DC2392A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2015
LT 1215 • PRINTED IN USA
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,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
