MIC5020_05 Datasheet, PDF (4/8 Pages) Micrel Semiconductor – Current-Sensing Low-Side MOSFET Driver

MIC5020
Typical Characteristics
Supply Current vs.
Supply Voltage
3.5
V_IN = 5V
3.0
2.5
2.0
1.5
1.0
V_IN = 0V
0.5
5 10 15 20 25 30 35 40 45 50
V_SUPPLY (V)
Input Current vs.
Input Voltage
100
V_SUPPLY = 12V
80
60
40
20
0
0 5 10 15 20 25
V_IN (V)
Sense Threshold vs.
Temperature
80
70
60
50
40
30
20
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
Micrel, Inc.
Turn-On Time vs.
Supply Voltage
900
V_{G ATE} = 4V
800
C_L = 1500pF
V_IN = 0 to 5V Sq. Wave
700
600
500
INCLUDES PROPAGATION DELAY
400
5 10 15 20 25 30 35 40 45 50
V_SUPPLY (V)
1200
1000
Turn-On Time vs.
Gate Capacitance
V_{G ATE} = 4V
800
600
400
INCLUDES PROPAGATION DELAY
200
1x10²
1x10³
1x10⁴
C_GATE (pF)
1x10⁵
Turn-Off Time vs.
Supply Voltage
1200
1100
1000
900
V_{G ATE} = 4V
C_L = 1500pF
V_IN = 0 to 5V
Sq. Wave
800
700
5
INCLUDES PROPAGATION DALAY
10 15 20 25 30
V_SUPPLY (V)
Overcurrent Shutdown
Retry Duty Cycle
25.0
20.0
t_ON = 5µs
V_SUPPLY = 12V
15.0
10.0
5.0
0.0
0.1 1
10 100 1000 10000
C_T (pF)
TTL (H)
Input
0V
Gate ^{15V (max.)}
0V
Sense +,– _50mV
Differential _0V
Off
Fault
On
Timing Diagram 1. Normal Operation
5µs
20µs
TTL (H)
Input
0V
Gate
15V (max.)
0V
Sense +,– _50mV
Differential _0V
Off
Fault
On
Timing Diagram 2. Fault Condition, C_T = Open
MIC5020
5µs
TTL (H)
Input
0V
Gate
15V (max.)
0V
Sense +,– 50mV
Differential _0V
Off
Fault
On
Timing Diagram 3. Fault Condition, C_T = Grounded
4
July 2005