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DS3920
Fast Current Mirror
  5
Maxim Integrated
Pin Configuration
Pin Description
Typical Operating Characteristics (continued)
(T
A
 = +25癈, unless otherwise noted.)
PIN
NAME
FUNCTION
1
DIODE
Protection Diode. External potential used
for voltage clamping of V
MIR
. If unused,
this pin can be left unconnected.
2
GND
Ground
3
MIR
Mirror Current Monitor Output, 5:1 Ratio
4
MIROUT
Current Mirror Voltage Output. Connect to
photodiode bias pin. Photodiode
provides reference current for the mirror.
5
N.C.
No Connection. Not internally
connected.
6
MIRIN
Current Voltage Bias
SOT23
TOP VIEW
GND
MIR
1
DIODE
2
3
MIROUT
6   MIRIN
5   N.C.
+
4
DS3920
SHORT-CIRCUIT RESPONSE
(V
MIRIN
 = 40V)
DS3920 toc12
20ms/div
CH1
0A
CH1: I
MIROUT
, 5mA/div
A: MIROUT SHORTS TO GND THROUGH 10&
B: CURRENT LIMIT ACTIVE
C: THERMAL SHUTDOWN
D: POST COOL-DOWN REENTRY
E: THERMAL SHUTDOWN
F: POST COOL-DOWN REENTRY
T
A
 = +40癈
A
B
C
D
E
F
SHORT-CIRCUIT RESPONSE
(V
MIRIN
 = 76V)
DS3920 toc13
20ms/div
CH1
0A
CH1: I
MIROUT
, 5mA/div
A: MIROUT SHORTS TO GND THROUGH 10&
B: CURRENT LIMIT ACTIVE
C: THERMAL SHUTDOWN
D: POST COOL-DOWN REENTRY
E: THERMAL SHUTDOWN
F: POST COOL-DOWN REENTRY
T
A
 = +40癈
A
B
C
D
E
F
VOLTAGE DROP vs. MIROUT CURRENT
I
MIROUT
 (mA)
10
1
0.1
0.01
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
0.001
100
V
MIRIN
 = 2.97V
T
A
 = -40癈
T
A
 = +25癈
T
A
 = +100癈
T
A
 = +85癈
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