53509 Series
TRIP PROFILE
700
Solid State Power Controllers
600
500
ALWAYS TRIP
% OF RATING
400
300
200
100
NEVER TRIP
0
0.01
0.1
1
TIME (SEC)
10
100
TRIP PROFILE
The Trip Profile is a combination of 2 separate functions; the I²t Circuit protection and the Short
Circuit protection. The I²t Circuit protection continuously monitors the Load Current and when the Load
Current exceeds a preset limit (110 to 120% of rating) the Time-Integral of the difference determines the
Trip time as indicated by the curved line on the chart (Typical Turn-off time is <1uS).
The Short Circuit protection continuously monitors the Load Current and when the Load Current
exceeds a preset limit (600% of Rating) it immediately shuts down the SSPC (Typical response time is <
50uS, Typical Turn-off time is <1uS).
Trip Profile External Trim
The Trip Profile is externally Programmable by connecting the proper resistance between Pins 12 and 13
(Trip Set - and Trip Set +). The following formula dictates the Profile setting:
Rext = ( 7 * Xprog / (1 – Xprog)) – 3
Where Xprog is the ratio of the desired trip point to the device rating. (0.3 < Xprog < 1)
Rext is in KOhms. Table 1 provides typical solutions for Rext.
Micropac Industries
cannot assume any responsibility for any circuits shown or represent that they are free from patent infringement.
Micropac
reserves the right to make changes at any time in order to improve design and to supply the best product possible.
MICROPAC INDUSTRIES, INC. MICROCIRCUITS PRODUCTS DIVISION
•
905 E. Walnut St., Garland, TX 75040
•
(972) 272-3571
•
Fax (972) 494-2281
www.micropac.com
E-MAIL:
microsales@micropac.com
11/30/06 Rev B
Pg. 3 of 5
MII [ Micropac Industries ]
