Analog Devices Linear Technology DC2708A Demo Manual

DESCRIPTION
Demonstration circuit 2708A is a 135V, high side switch
featuring the LTC
to switch a 5A output load from 0V up to 135V. This
board offers a low 50ns (typical) propagation delay, fast
switching times (<10ns) and 100% duty cycle operation.
The LTC7001 is a fast high voltage high side N-channel
MOSFET driver. 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 LTC7001 operates over a 0V to
135V input supply range.
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
by providing an external signal on INPUT turret. The V
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Voltage
IN
I Output Current
OUT
Insertion Drop
V Main Supply
CC
V V Undervoltage Lockout
CCUV CC
Input to Output Propagation Delay
Output Rise Time
Arrow.com.
Downloaded from
High Side NMOS Static Switch Driver
7001. The demo board is designed
®
CONDITIONS
V – V
IN OUT
V Rising
CC
V Falling
CC
Hysteresis
V = 135V, 50Ω Load, INP = 2.2V to V
IN
V = 135V, 50Ω Load, 10% to 90%
IN
input must be powered with an external power supply to
provide power to the controller. Positions for RC delay
network to control inrush current are also included.
The LTC7001 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 2708A. Proper board layout is essential
for maximum thermal and electrical performance. See the
data sheet sections for details. The LTC7001 is available
in 10-lead MSOP package and three operating junction
temperature grades, extended and industrial from –40°C
to 125°C, a high temp automotive version from –40°C to
150°C and a military grade version from –55°C to 150°C.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2708A
CC
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.
Specifications are at T = 25°C
A
, 5A Load, Input to Output Terminals
= 13.5V
OUT
DEMO MANUAL
DC2708A
LTC7001
Fast High Voltage
MIN TYP MAX
0 135
5
115
7 12
6.5 7.0 7.5
5.8 6.4 6.9
0.6
50
6.5
UNITS
V
A
mV
V
V
V
V
ns
ns
dc2708af
1