DC1555B - Demo Manual

DEMO MANUAL DC1555B
LTC4365: High Voltage
UV, OV and Reverse Supply
Protection Controller
Description
Demonstration circuit DC1555B is intended to demonstrate
the performance of the LTC4365 High Voltage Undervoltage
(UV), Overvoltage (OV) and Reverse Supply Protection
Controller.
The LTC4365 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 MOSFETs to keep
the output in a safe range. The OV and UV protection levels
are adjusted by resistive dividers at the OV and UV pins.
Asserting the SHDN pin disables the MOSFETs and places
the LTC4365 in a low-current shutdown state. The FAULT
pin is asserted when the Controller is in shutdown mode
PERFORMANCE SUMMARY
or when the input voltage is outside of the UV or OV level.
The LTC4365 can withstand DC voltages between –40V
and 60V and has a valid operating range of 2.5V to 34V.
The DC1555B includes the LTC4365 Controller, two backto-back connected power MOSFETs, three jumpers and
three LEDs to indicate the input and output voltages and
the FAULT pin signal.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
(TA = 25°C)
SYMBOL
PARAMETER
CONDITIONS
VIN
Board Input Voltage Range
VIN(UVLO)
Input Supply Undervoltage Lockout
VIN Rising
IVIN
Input Supply Current
SHDN = 0V
SHDN = 2.5V
IVIN(R)
Reverse Input Supply Current
VIN = –40V, VOUT = 0V
ΔVGATE
External N-Channel Gate Drive (GATE – VOUT)
VIN = VOUT = 5V, IGATE = –1µA
VIN = VOUT = 12V to 34V, IGATE = –1µA
IGATE(UP)
External N-Channel Gate Pull-Up current
IGATE(FAST)
External N-Channel Fast Gate Pull-Down Current
MIN
TYP
–30
30
UNITS
V
2.2
2.4
V
10
25
50
150
µA
µA
–1.2
–1.8
mA
3
7.4
3.6
8.4
4.2
9.8
V
V
GATE = VIN = VOUT = 12V
–12
–20
–30
µA
Fast Shutdown, GATE = 20V, VIN = VOUT = 12V
31
50
72
mA
50
90
150
µA
IGATE(SLOW) External N-Channel Gentle Gate Pull-Down Current Gentle Shutdown, GATE = 20V, VIN = VOUT = 12V
1.8
MAX
VUV
UV Input Threshold Voltage
UV Falling → ΔVGATE = 0V
492.5
500
507.5
mV
VOV
OV Input Threshold Voltage
OV Rising → ΔVGATE = 0V
492.5
500
507.5
mV
tGATE(FAST)
External N-Channel Fast Gate 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 to ΔVGATE = 0V
0.75
1.2
V
0.4
dc1555bfa
1
DEMO MANUAL DC1555B
Operating Principles
The LTC4365 monitors the input rail voltage and disconnects downstream circuits when the input voltage is too
low, too high or negative. The LTC4365 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 circuit automatically isolates the load from
negative input voltages.
During normal operation, a high voltage charge pump
enhances the gate of external N-channel power MOSFETs.
The LTC4365 consumes 10µA during shutdown and 125µA
while operating.
quick start procedure
Demonstration circuit 1555B is easy to set up to evaluate
the performance of the LTC4365. Refer to Figures 1a and
1b for proper measurement equipment setup and follow
the procedure below.
Note that the circuit on the DC1555B is optimized for 12V
operation; The Si4230 FET limits overvoltage and reverse
voltage to 30V and –30V, respectively. Refer to the LTC4365
data sheet for applications optimized for other voltages.
Reverse Voltage Tests (Figure 1a)
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 rail to GND and negative
rail to VIN).
4)Connect voltmeters at the input and output and ammeter
in series with supply.
5)Ramp supply down to –30V (referenced to GND).
6)Verify output voltage is between 0V and –0.5V, all LEDs
are off, and input current is <1.8mA. (FET leakage or
other board leakage paths can pull VOUT slightly negative, but it will be clamped by the internal protection
diode.)
7)Ramp supply back to 0V.
2
Undervoltage/Overvoltage Test (Figure 1b)
8)Reverse the polarity of power supply connection across
VIN to GND (connect positive rail to VIN and negative
rail to GND).
9)Ramp supply up to 30V and verify green VIN LED, red
FAULT LED, green VOUT LED, and VOUT according to
Table 1 within the various voltage ranges.
10)Ramp supply down from 30V down to 0V and verify
green VIN LED, red FAULT LED, green VOUT LED, and
VOUT according to Table 1.
11)Repeat steps 9 and 10 with 8A load connected across
VOUT and GND.
Table 1
VIN
VOUT
VIN LED
VOUT LED
FAULT LED
0V to 5.77V
= 0V
Off/Dim/On
Off
On
6.56V to 13.51V
= VIN
On
On
Off
15.47V to 30V
= 0V
On
Off
On
Jumper Test
12)Remove load and set supply to 9V.
13)Move jumpers and verify LEDs according to Table 2.
Table 2
JP1
JP2/JP3
VIN LED
VOUT LED
EN
CONNECT LED
On
On
DIS
CONNECT LED
On
Off
EN
Open
Off
Off
dc1555bfa
DEMO MANUAL DC1555B
quick start procedure
–
POWER
SUPPLY
0V TO 30V
+
dc1555b F01a
Figure 1a. Reverse Voltage Measurement
+
POWER
SUPPLY
R
0V TO 30V
–
LOAD
dc1555b F01b
Figure 1b. Undervoltage/Overvoltage Measurement
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DEMO MANUAL DC1555B
parts list
ITEM
QUANTITY
REFERENCE
DESCRIPTION
MANUFACTURERS PART NUMBER
Required Circuit Components
Current Limiting, Diode, SOD-80
Central Semi. Corporation, CCLM2000
C1 (OPT)
Capacitor, X5R, 4.7µF, 50V, 20%, 1210
Taiyo Yuden, UMK325BJ475MM-T
C2 (OPT)
Capacitor, Alum, 47µF, 35V, 10%, OSCON-CE-6.3
Sanyo, 35CE47AX
0
C3 (OPT)
Capacitor, X5R, 10µF, 25V, 10%, 1210
Taiyo Yuden, TMK325BJ106KM
2
D1, D2
LED, GRN
Panasonic, LN1351CTR
6
1
D3
LED, RED
Panasonic, LN1251CTR
7
1
D4
Diode, 75V/200mW, SOD-523
Diodes Inc., 1N4148WT
8
0
D5 (OPT)
Zener Diode, 15V, SOD-523
Diodes Inc., BZT52C15T #PbF
9
0
D6 (OPT)
Zener Diode, 20V, POWERDI-123
Diodes Inc., DFLT20A #PbF
10
0
D7 (OPT)
Zener Diode, 40V, POWERDI-123
Diodes Inc., DFLT40A #PbF
11
4
E1, E2, E6, E7
Turret, Testpoint 0.094"
Mill Max 2501-2-00-80-00-00-07-0
12
4
E3, E4, E5, E8
Turret, Testpoint 0.063"
Mill Max 2308-2-00-80-00-00-07-0
13
3
JP1, JP2, JP3
Headers, Sgl. Row, 3 Pins, 2mm Ctrs.
Samtec, TMM-103-02-L-S
14
1
Q1
Dual N-Channel, 30V, SO-8
Vishay, SI4230DY-T1-GE3
15
0
Q2 (OPT)
Dual N-Channel, Low Current, SOT-563
Diodes Inc., 2N7002V-7
16
1
R1 (Bal to #1608A)
Resistor, Chip, 1M, 0.06W, 1%, 0603
Vishay, CRCW06031M00FKEA
17
1
R2
Resistor, Chip, 54.9k, 0.06W, 1%, 0603
Vishay, CRCW060354K9FKEA
18
1
R3
Resistor, Chip, 36.5k, 0.06W, 1%, 0603
Vishay, CRCW060336K5FKEA
19
1
R4
Resistor, Chip, 510k, 0.06W, 5%, 0603
Vishay, CRCW0603510KJNEA
20
1
U1
IC, Over/Under/RevV/RevI Protection, SC8
Linear Technology Corporation, LTC4365CTS8
21
3
XJP1, XJP2, XJP3
Shunt, 2mm Ctrs.
Samtec, 2SN-BK-G
22
4
Stand-Off, Nylon, 0.25" Tall
Keystone, 8831(Snap On)
4
1
3
CLD1, CLD2, CLD3
2
0
3
0
4
5
dc1555bfa
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.
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B
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SHDN
FAULT
VOUT
GATE

GND
OV
UV
VIN




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
CUSTOMER NOTICE
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
3
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SCALE = NONE
Vlad O.
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TITLE: SCHEMATIC
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REVISION HISTORY

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
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

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A
B
C
D
DEMO MANUAL DC1555B
Schematic Diagram
dc1555bfa
5
DEMO MANUAL DC1555B
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
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Mailing Address:
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Copyright © 2004, Linear Technology Corporation
6
dc1555bfa
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