DC2417A - Demo Manual

DEMO MANUAL DC2417A
LTC4367
100V Overvoltage, Undervoltage and
Reverse Supply Protection Controller
DESCRIPTION
Demonstration circuit 2417A is intended to demonstrate
the performance of the LTC4367 100V overvoltage (OV),
undervoltage (UV), and reverse supply protection controller.
This controller protects circuits from input voltages
that may be too high, too low or negative. It operates
by controlling the gates of two back-to-back connected
N-channel MOSFETs to keep the output in a safe range.
The UV and OV setpoints are configured by the resistive
divider on the UV and OV inputs. Asserting the SHDN pin
disables the MOSFETs and places the LTC4367 in a low
current shutdown state. The FAULT pin asserts when the
controller is in the shutdown mode or when the input
voltage is outside of the UV/OV window. The LTC4367
PERFORMANCE SUMMARY
can withstand DC voltages between –40V and 100V and
has an operating range of 2.5V to 60V.
The DC2417A includes the LTC4367, two back-to-back
connected power MOSFETs, three jumpers and three
LEDs to indicate the input and output voltages and the
FAULT pin signal.
The DC2417A is assembled in two options: DC2417A-A,
which is populated with LTC4367, and DC2417A-B, which
uses LTC4367-1.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2417A
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.
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
MIN
VIN
Input Voltage Range
Operating Range
Protection Range
2.5
–40
VIN(UVLO)
Input Supply Undervoltage Lockout
VIN Rising
1.8
IVIN
Input Supply Current;On
Off
IVIN(R)
TYP
MAX
UNITS
60
100
V
V
2.2
2.4
V
SHDN = 2.5V
SHDN = 0V, VIN = VOUT
30
5
90
20
µA
µA
Reverse Input Supply Current
VIN = –40V, VOUT = 0V
–1.5
–2
mA
∆VGATE
Gate Drive (GATE – VOUT)
VIN = VOUT = 5.0V, IGATE = 0μA, –1μA
VIN = VOUT = 12V to 34V, IGATE = –1µA
7.2
10
8.7
11
10.8
12.2
V
V
IGATE(UP)
Gate Pull-Up Current
GATE = 15V, VIN = VOUT = 12V
–20
–35
–50
µA
IGATE(FAST)
Gate Fast Pull-Down Current
GATE = 20V, VIN = VOUT = 12V
30
60
90
mA
IGATE(SLOW)
Gate Slow Pull-Down Current
GATE = 20V, VIN = VOUT = 12V
50
90
160
µA
VUV
UV Input Threshold Voltage
UV Falling
492.5
500
507.5
mV
VOV
OV Input Threshold Voltage
OV Rising
492.5
500
507.5
mV
tGATE(FAST)
Gate Fast Turn-Off Delay
CGATE = 2.2nF, UV or OV Fault
2
4
µs
tFAULT
OV, UV Fault Propagation Delay
Overdrive = 50mV, VIN = VOUT = 12V
1
2
µs
VSHDN
SHDN Input Threshold
SHDN Falling
0.75
1.2
V
VUV_BOARD
Board UV Range
5.75
5.97
6.17
V
VOV_BOARD
Board OV Range
14.44
14.95
15.47
V
0,4
dc2417af
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DEMO MANUAL DC2417A
OPERATING PRINCIPLES
The LTC4367 monitors the input voltage and disconnects
downstream circuits when the input voltage is too low, too
high or negative. The LTC4367 provides accurate overvoltage and undervoltage comparators to ensure that power
is applied to the system only if the input supply is within
the allowable voltage window. Reverse supply protection
circuits automatically isolate the load from negative input
voltages.
During normal operation, a high voltage charge pump enhances the gate of the external N-channel power MOSFETs.
The LTC4367 consumes 5μA during shutdown and 70μA
while operating.
QUICK START PROCEDURE
DC2417A is easy to set up to evaluate the performance of
the LTC4367. Refer to Figure 1 for proper measurement
equipment setup and follow the procedure below.
Reverse Voltage Tests
1 Set JP1 to EN.
2 Set JP2 and JP3 to CONNECT LED.
3 Connect a power supply across VIN and GND in negative configuration (connect positive terminal to GND
and negative terminal to VIN).
4 Connect voltmeters at the input and output and an
ammeter in series with the supply.
5 Ramp VIN down to –30V (referenced to GND).
10Ramp supply up to 60V and verify that the green VIN
LED and the red FAULT LED light up, but the green
VOUT LED, does not light up.
11Ramp supply down from 60V to 0V and verify the green
VIN LED, red FAULT LED, green VOUT LED, and VOUT
voltage according to Table 1 below.
12Repeat steps 10 and 11 with a 3 A resistive load connected between VOUT and GND.
Table 1
VIN
VOUT
VIN LED
VOUT LED
FAULT LED
0V to 5.97V
0V
Off/Dim/On
Off
On
5.97V to 14.95V
VIN
On
On
Off
14.95V to 60V
0V
On
Off
On
6 Verify output voltage is 0V and all LEDs are off.
13Remove load and set supply to 9V.
7 Set JP2 and JP3 to OPEN position and measure the
input current. It should be ≤2.4mA.
14Move jumpers and verify LEDs according to Table 2
below.
8 Ramp VIN back to 0V and set JP2 and JP3 to CONNECT
LED position.
Table 2
JP1
JP2/JP3
VIN LED
VOUT LED
On
On
Undervoltage/Overvoltage Test
EN
CONNECT LED
DIS
CONNECT LED
On
Off
9 Correct the polarity of the power supply connection
across VIN to GND (connect positive terminal to VIN
and negative terminal to GND).
EN
OPEN
Off
Off
dc2417af
2
DEMO MANUAL DC2417A
QUICK START PROCEDURE
–
POWER
SUPPLY
0V TO 40V
+
Figure 1a. Reverse Voltage Test
dc2417af
3
DEMO MANUAL DC2417A
QUICK START PROCEDURE
+
POWER
SUPPLY
R
0V TO 100V
–
LOAD
Figure 1b. Undervoltage/Overvoltage Test
dc2417af
4
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.
A
B
C
D
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


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



5



4
4

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
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











SHDN
FAULT
VOUT
GATE

SOD-523














GND
OV
UV
VIN


CUSTOMER NOTICE











3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

APPROVALS




SCALE = NONE
Vlad O.
2
2







TECHNOLOGY
U1


1

SHEET
1
OF
1


IC NO.
REV.

2



 www.linear.com


DC2417A-A
DC2417A-B
MODIFY DATE: 

SIZE
(OPT)

BOARD ASSEMBLY
+






Oct 07, 2015
DATE
May 28, 2015
APPROVED

1
DESCRIPTION
1st Prototype
REVISION HISTORY
TITLE: SCHEMATIC
Q3
(OPT)
DPAK
REV
ECO
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.


Q2
(OPT)
DPAK
3
A
B
C
D
DEMO MANUAL DC2417A
SCHEMATIC DIAGRAM
dc2417af
5
DEMO MANUAL DC2417A
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.).
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customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
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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
dc2417af
6
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