Datasheet

DS3920
Fast Current Mirror
5Maxim Integrated
Pin Configuration Pin Description
Typical Operating Characteristics (continued)
(T
A
= +25°C, 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
1DIODE
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 10Ω
B: CURRENT LIMIT ACTIVE
C: THERMAL SHUTDOWN
D: POST COOL-DOWN REENTRY
E: THERMAL SHUTDOWN
F: POST COOL-DOWN REENTRY
T
A
= +40°C
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 10Ω
B: CURRENT LIMIT ACTIVE
C: THERMAL SHUTDOWN
D: POST COOL-DOWN REENTRY
E: THERMAL SHUTDOWN
F: POST COOL-DOWN REENTRY
T
A
= +40°C
A
B
C
D
E
F
VOLTAGE DROP vs. MIROUT CURRENT
DS3920 toc14
I
MIROUT
(mA)
V
MIRIN
- V
MIROUT
(V)
1010.10.01
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°C
T
A
= +25°C
T
A
= +100°C
T
A
= +85°C