Analog Devices Linear DC2492A Manual

Description
Demonstration circuit 2492A is a 135V protected, high
side switch featuring the
designed to switch a 5.5A output load from input voltages
from 8V to 135V. The wide input range and low shutdown
current (1µA typical) make it suitable for automotive,
industrial, medical instrument and telecom applications.
This board offers a low 50ns (typical) propagation delay,
fast switching times (<10ns) and 100% duty cycle opera-
tion.
The LTC7000-1 is a fast high voltage protected high side
N-channel MOSFET driver with high voltage pin spacing
(0.657mm). An internal charge pump fully enhances an
external N-channel MOSFET switch, allowing it to remain
on indefinitely. A powerful gate driver can drive large gate
capacitance MOSFETs with very short transition times,
ideal for both high frequency switching and static switch
applications. The LTC7000-1 operates over a 3.5V to 135V
input supply range. When an external current sense resis-
tor and internal comparator sense that the switch current
has exceeded a preset level, a fault flag is asserted and
the switch is turned off after a period of time set by an
external timing capacitor. After a cooldown period, the
LTC7000-1 can be configured to automatically retry or
remain off until the input is re-cycled.
performance summary
SYMBOL PARAMETER
V Input Voltage
IN
I Output Current
OUT
Insertion Drop
V Start-Up Voltage
IN
V V Undervoltage Lockout
CCUV CC
Overcurrent to V
OUT
Input to Output Propagation Delay
Output Rise Time
High Side NMOS Static Switch Driver
LTC 7000-1. The demo board is
®
Specifications are at T
CONDITIONS
V – V , 5.5A Load, Input to Output Terminals
IN OUT
100kΩ Load, V
INP
V Rising
CC
V Falling
CC
Hysteresis
Low Turn-On into a 10A Resistive Load
V = 135V, 50Ω Load, INP = 2.2V to V
IN
V = 135V, 50Ω Load, 10% to 90%
IN
DEMO MANUAL DC2492A
Fast High Voltage Protected
The demo board includes input capacitors and an output
diode to accommodate input and output supply induc-
tance when switching loads. The switch can be controlled
directly with external signal or using the on-board on/
off switch. A single-shot pulse generator is included for
evaluating switching times while limiting output power.
Optional auxiliary V
associated with high frequency switching. Positions for RC
delay network to control inrush current are also included.
The LTC7000-1 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
for demo circuit 2492A. Proper board layout is essential
for maximum thermal and electrical performance. See the
data sheet sections for details. The LTC7000-1 is available
in 16-lead MSOP package and three operating junction
temperature grades, extended and industrial from –40°C
to 125°C, high temp automotive version from –40°C to
150°C and a military grade from –55°C to 150°C.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2492A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
= 25°C
A
= 4V
= 13.5V
OUT
LTC7000-1
input accommodates gate power
CC
MIN TYP MAX
8.0 135
5.5
150
7.0 8.0
6.5 7.0 7.5
5.8 6.4 6.9
0.6
19
50
6.5
UNITS
V
A
mV
V
V
V
V
µs
ns
ns
dc2492af
1