Linear Technology DC1555B Demo Manual
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Linear Technology DC1555B Demo Manual

High voltage uv, ov and reverse supply protection controller
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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
SYMBOL
PARAMETER
V
Board Input Voltage Range
IN
V
Input Supply Undervoltage Lockout
IN(UVLO)
I
Input Supply Current
VIN
I
Reverse Input Supply Current
VIN(R)
ΔV
External N-Channel Gate Drive (GATE – V
GATE
I
External N-Channel Gate Pull-Up current
GATE(UP)
I
External N-Channel Fast Gate Pull-Down Current
GATE(FAST)
I
External N-Channel Gentle Gate Pull-Down Current Gentle Shutdown, GATE = 20V, V
GATE(SLOW)
V
UV Input Threshold Voltage
UV
V
OV Input Threshold Voltage
OV
t
External N-Channel Fast Gate Turn-Off Delay
GATE(FAST)
t
OV, UV Fault Propagation Delay
FAULT
V
SHDN Input Threshold
SHDN
Arrow.com.
Downloaded from
DEMO MANUAL DC1555B
UV, OV and Reverse Supply
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 back-
to-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.
(T
= 25°C)
A
CONDITIONS
V
Rising
IN
SHDN = 0V
SHDN = 2.5V
V
= –40V, V
= 0V
IN
OUT
)
V
= V
= 5V, I
= –1µA
OUT
IN
OUT
GATE
V
= V
= 12V to 34V, I
IN
OUT
GATE = V
= V
= 12V
IN
OUT
Fast Shutdown, GATE = 20V, V
UV Falling → ΔV
= 0V
GATE
OV Rising → ΔV
= 0V
GATE
C
= 2.2nF , UV or OV Fault
GATE
Overdrive = 50mV, V
IN
SHDN Falling to ΔV
GATE
LTC4365: High Voltage
Protection Controller
MIN
–30
1.8
3
= –1µA
7.4
GATE
–12
= V
= 12V
31
IN
OUT
= V
= 12V
50
IN
OUT
492.5
492.5
= V
= 12V
OUT
= 0V
0.4
TYP
MAX
UNITS
30
V
2.2
2.4
V
10
50
µA
25
150
µA
–1.2
–1.8
mA
3.6
4.2
V
8.4
9.8
V
–20
–30
µA
50
72
mA
90
150
µA
500
507.5
mV
500
507.5
mV
2
4
µs
1
2
µs
0.75
1.2
V
dc1555bfa
1

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Summary of Contents for Linear Technology DC1555B

  • Page 1 LTC4365 in a low-current shutdown state. The FAULT pin is asserted when the Controller is in shutdown mode 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.

  • Page 2: Operating Principles

    GND (connect positive rail to V and negative the procedure below. rail to GND). Note that the circuit on the DC1555B is optimized for 12V 9) Ramp supply up to 30V and verify green V LED, red operation; The Si4230 FET limits overvoltage and reverse...
  • Page 3 DEMO MANUAL DC1555B qUick stArt proceDUre – POWER 0V TO 30V SUPPLY dc1555b F01a Figure 1a. Reverse Voltage Measurement POWER 0V TO 30V SUPPLY – LOAD dc1555b F01b Figure 1b. Undervoltage/Overvoltage Measurement dc1555bfa Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from...

  • Page 4: Parts List

    DEMO MANUAL DC1555B pArts list ITEM QUANTITY REFERENCE DESCRIPTION MANUFACTURERS PART NUMBER Required Circuit Components CLD1, CLD2, CLD3 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...

  • Page 5: Schematic Diagram

    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.
  • Page 6 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.

This manual is also suitable for:

Ltc4365Ltc4365cts8

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