DRV401-EP Datasheet, PDF (24/33 Pages) Texas Instruments – SENSOR SIGNAL CONDITIONING IC FOR CLOSED-LOOP MAGNETIC CURRENT SENSOR

DRV401-EP
SBVS104 – JANUARY 2008............................................................................................................................................................................................... www.ti.com
BASIC CONNECTION EXAMPLE
The circuit shown in Figure 8 offers an axample of a fully-connected current sensor system.
I_P
Probe
Core
Probe Coil
S1
S2
IS2
Current Sensor Module
R₃
R₄ C₄
C₃
+5V
Primary Winding
Main Core
Compensation Coil
K₁
K₂
I_COMP
R₂
R₁
+5V
D₁
D₂
IS1 IS2
PWM PWM
GAIN
(PWM is in
phase with IS1.)
CCdiag
+5V V_DD1
Probe Coil
C₂
Driver and
V_SW
Comparator
GND1
Integrator
H−Bridge
Driver
I_COMP1 I_COMP2 IA_IN2
IA_IN1
V_SW
Bandgap
Reference
Amp
+5V
V=4
R₆
OVER−RANGE
R₅
V_OUT
REF_IN
2.5V
REF_OUT
DEMAG
Logic: Timing, Error Detection, and Demagnetize
DRV401
R₇
+5V
ERROR
10MHz
Oscillator Reset
Power Valid
+5V
V_DD2
C₄
GND2
Figure 8. Basic Connection Circuit
24
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