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Linear Technology DC1555A Demo Manual

Ltc4365: high voltage uv, ov and reverse supply protection controller
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DESCRIPTION
Demonstration circuit DC1555A 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 shutdown 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
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
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
DEMO MANUAL DC1555A
UV, OV and Reverse Supply
mode 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 DC1555A 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 fi les 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
OUT
IN
OUT
GATE
V
= V
= 12V to 34V, I
IN
OUT
= V
= V
= 12V
GATE
IN
OUT
Fast Shutdown, GATE = 20V, V
UV Falling, ΔV
GATE(ON)
OV Rising, ΔV
GATE(ON)
CV
= 2.2nF
FGATE
UV: 1V 0.48V or OV: 0.52V to ΔV
UV: 1V 0.48V or OV: 0.52V to FAULT = Low
SHDN Falling to ΔV
GATE
LTC4365: High Voltage
Protection Controller
MIN
–40
1.8
= –1μA
3
= –1μA
7.4
GATE
–12
= V
= 12V
31
IN
OUT
= V
= 12V
50
IN
OUT
= 0V
492.5
= 0V
492.5
= 0V
GATE
= 0V
0.4
TYP
MAX
UNITS
60
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
180
μA
500
507.5
mV
500
507.5
mV
2
4
μs
μA
1
2
μs
0.75
1.2
V
dc1555af
1

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Summary of Contents for Linear Technology DC1555A

  • Page 1 LTC4365 in a low-current shutdown state. The FAULT pin is asserted when the Controller is in shutdown 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 GND (connect positive rail to V and negative the procedure below. rail to GND). Note that the circuit on the DC1555A 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 DC1555A QUICK START PROCEDURE – POWER 0V TO 20V SUPPLY dc1555a F01a Figure 1a. Reverse Voltage Measurement POWER 0V TO 30V SUPPLY – LOAD dc1555a F01b Figure 1b. Undervoltage/Overvoltage Measurement dc1555af...
  • Page 4 DEMO MANUAL DC1555A 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.