LT1999-10 Datasheet, PDF (21/24 Pages) Linear Technology – High Voltage, Bidirectional Current Sense Amplifier Low Power Shutdown <10μA

Typical Applications
H-BRIDGE
5V
PWM INPUT
PWM IN
DIRECTION
BRAKE INPUT
24V
C4
1000µF
V_BRIDGE
OUTA
OUTB
LT1999-10/LT1999-20/
LT1999-50
5V
10µF
V_+IN
V_–IN
V⁺
1
LT1999-20
2 ^4k
V⁺
+
–
0.8k
SHDN
3
4k
0.8k
R_SENSE
0.025Ω
5V
V⁺
4
24V MOTOR
V⁺
2µA
8
80k
–
+
7
V⁺
160k
6
160k
5
1999 F09
V_SHDN
0.1µF
V_OUT
V_REF
0.1µF
GND
Figure 9. Armature Current Monitor for DC Motor Applications
V_OUT
2.5V
V_+IN
TIME (20µs/DIV)
1999 F10
Figure 10. LT1999 Output Waveforms for the Circuit of Figure 9
1999fb
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