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  AD8xx-xx to AD9xx-xx 
Output Transistor Current in Short Circuit mode:
100
200
300
Time
t
2
t
1
Output Transistor Current in Short Circuit
 
 
Notes:
1.
The t
2
 Cap is used to delay the startup of the SCP circuitry, in order to avoid triggering the SCP
circuitry on normal startup transients: see t
2
 on the graph above. Typical value is 16V, 0.001糉, for
a 35約 delay.
 
2.
The t
1
 Cap is used to set the Off time of the SCP circuitry; see t
1
 on the graph above. Typical
value is 16V, 0.01糉, for a 15ms Off time.
 
3.
The voltage across R
SHORT
 is monitored by the IC; if this voltage exceeds 145mV (typical), the SCP
circuitry is activated. Typical value of R
SHORT
 is 0.47 Ohms, 1/16 watt. This will result in SCP
circuitry turning on at about 300mA of output current.
 
4.
R
BIAS1
 and R
BIAS2
 are used to bias the output transistor. Typical values for R
BIAS1
 and R
BIAS2
 are 16K
and 3K, respectively, to supply 1mA drive to the output transistor.
 
5.
R
LED
 is sized for whatever LED current is required by the user; maximum of 3 mA.
 
 
 
 
 
Magnetic Characteristics:
 
Typical Operate
Point
Minimum
Operate Point
Maximum
Operate Point
Minimum
Differential
1,2
Maximum
Differential
1,2
20
15
25
5
14
28
21
32.5
5
15
40
30
50
5
25
80
60
100
5
35
 
Note: All Values in Oersteds (Oe); 1 Oe = 1 Gauss in Air
 
 
 
 
  NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA
  (800) 467-7141 Web: www.nve.com
  Email: info@nve.com
  11/15/02
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