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DRV401-EP Datasheet, PDF (4/33 Pages) Texas Instruments – SENSOR SIGNAL CONDITIONING IC FOR CLOSED-LOOP MAGNETIC CURRENT SENSOR
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DRV401-EP
SBVS104 – JANUARY 2008............................................................................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Boldface limits apply over the specified temperature range: TJ = –55°C to +125°C.
At TA = +25°C and VDD1 = VDD2 = +5 V with external 100 kHz filter BW, and zero output current ICOMP, unless otherwise noted.
PARAMETER
CONDITIONS
DRV401
MIN
TYP
UNITS
MAX
FREQUENCY RESPONSE
BW–3dB
SR
Bandwidth (5)
Slew rate(5)
CMVR = –1 V to = +4 V
2
MHz
6.5
V/µs
Settling time, large-signal(5)
Settling time(5)
dV ± 2 V to 1%,
No external filter
dV ± 0.4 V to 0.01%
0.9
µs
14
µs
INPUT RESISTANCE
Differential
16.5
20
23.5 kΩ
Common-mode
41
50
59 kΩ
External reference input
41
50
59 kΩ
NOISE
en
Output voltage noise density, f = 1 kHz,
RTO (5)
Compensation loop disabled
170
nV/√Hz
COMPENSATION LOOP
DC STABILITY
Offset error(6)
Probe f = 250 kHz,
RLOAD = 20 Ω
Deviation from 50% PWM,
Pin gain = L
0.03
%
PSRR
Offset error drift(5)
Gain, pin gain = L(5)
Power-supply rejection ratio
Deviation from 50% PWM,
Pin gain = L
7.5
ppm/°C
|VICOMP1| – |VICOMP2|
Probe loop f = 250 kHz
–200
25
200 ppm/V
500
ppm/V
FREQUENCY RESPONSE
Open-loop gain, two modes, 7.8 kHz
Pin gain H/L
24/32
dB
PROBE COIL LOOP
RHIGH
RLOW
Input voltage clamp range
Internal resistor, IS1 or IS2 to VDD1(5)
Internal resistor, IS1 or IS2 to GND1(5)
Resistance mismatch between IS1 and
IS2 (5)
Total input resistance(7)
Comparator threshold current(7)
Minimum probe loop half-cycle(5)
Field probe current < 50 mA
ppm of RHIGH + RLOW
–0.7
47
60
–0.7 to VDD
59
75
300
134
22
28
250
280
V
71 Ω
90 Ω
1500 ppm
200 Ω
34 mA
310 ns
Probe loop minimum frequency
250
kHz
No oscillation detect (error) suppression
35
µs
COMPENSATION COIL DRIVER, H-BRIDGE
Peak current(5)
Voltage swing
Output common-mode voltage
Wire break detect, threshold current(8)
VOLTAGE REFERENCE
Voltage (5)
Drift (5)
VICOMP1 – VICOMP2 = 4.0VPP
20 Ω load
ICOMP1 and ICOMP2 railed
No load
No load
4.2
2.495
250
VDD2/2
33
2.5
±5
mA
VPP
V
57 mA
2.505 V
ppm/°C
(5) See Typical Characteristics curves.
(6) For VAC sensors, 0.2% of PWM offset approximately corresponds to 10 mA primary current offset per winding.
(7) Total input resistance and comparator threshold current are inversely related. See Figure 2a.
(8) See Compensation Driver section in Applications Information.
4
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