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參數(shù)資料
| 型號(hào)： | NCV1124 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Dual Variable-Reluctance Sensor Interface IC(雙可變磁阻傳感器接口電路) |
| 中文描述： | 雙可變磁阻傳感器接口IC（雙可變磁阻傳感器接口電路） |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 172K |
| 代理商： | NCV1124 |
NCV1124
http://onsemi.com
6
APPLICATION INFORMATION
Referring to Figure 2, the following will be a design
example given these system requirements:
RRS
1.5 k
(
12 k
is considered open)
VRS(MAX)
120 Vpk
VRS(MIN)
250 mVpk
FVRS
10 kHz @ VRS(MIN)
40 Vpkpk
1. Determine tradeoff between R1 value and power
rating. (use 1/2 watt package)
PD
120
2
R1
2
1 2 W
Set R1 = 15 k. (The clamp current will then be 120/15 k
= 8.0 mA, which is less than the 12 mA limit.)
2. Determine R
Adj
Set R
Adj
as close to R1 + R
RS
as possible.
Therefore, R
Adj
= 17 k.
3. Determine V
RS(+TRP)
using equation (7).
VRS(+TRP)
11 A
17 k
11 A(15 k
1.5 k)
160 m
VRS(+TRP)
(easily meets 250 mV minimum)
166 mV typical
4. Calculate worst case V
RS(+TRP)
Examination of equation (7) and the spec reveals the worst
case trip voltage will occur when:
V
HYS
= 180 mV
IN
Adj
= 16 A
INP1 = 15 A
R1 = 14.25 k (5% low)
R
Adj
= 17.85 k (5% High)
VRS(+)MAX
16 A(17.85 k)
15 A(14.25 k
229 mV
1.5 k)
180 mV
which is still less than the 250 mV minimum amplitude of
the input.
5. Calculate C1 for low pass filtering
Since the sensor guarantees 40 V
pkpk
@ 10 kHz, a low
pass filter using R1 and C1 can be used to eliminate high
frequency noise without affecting system performance.
Gain Reduction
0.29 V
20 V
0.0145
36.7 dB
Therefore, a cutoff frequency, f
C
, of 145 Hz could be
used.
C1
1
2 fCR1
0.07 F
Set C1 = 0.047 F.
6. Calculate the minimum R
RS
that will be indicated as
an open circuit. (DIAG = 5.0 V)
Rearranging equation (7) gives
RRS
VHYS
VRS(+TRP)
[INP1
KI
RAdj]
INP1
R1
But, V
RS
= 0 during this test, so it drops out.
Using the following as worst case Low and High:
Worst Case Low (R
RS
)
23.6 A = 15 A
×
1.57
16.15 k
Worst Case High (R
RS
)
10.7 A = 7.0 A
×
1.53
17.85 k
IN
Adj
R
Adj
V
HYS
INP1
135 mV
185 mV
16 A
6.0 A
R1
15.75 k
14.25 k
K
I
1.57
1.53
RRS
135 mV
23.6 A
16 A
16.15 k
15.75 k
16.5 k
Therefore,
RRS(MIN)
16.5 k (meets 12 k system spec)
and,
RRS(MAX)
185 mV
10.7 A
6.0 A
17.85 k
14.25 k
48.4 k
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