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參數(shù)資料
| 型號： | CA3524F |
| 廠商： | HARRIS SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulating Pulse Width Modulator |
| 中文描述： | 0.1 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, CDIP16 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 206K |
| 代理商： | CA3524F |
14
CA1524, CA2524, CA3524
Digital Readout Scale
The CA1524 can be used as the driving source for an
electronic scale application. The circuit shown in Figures 24
and 25 uses half (Q2) of the CA1524 output in a low-voltage
switching regulator (2.2V) application to drive the LED’s
displaying the weight. The remaining output stage (Q1) is
used as a driver for the sampling plates PL1 and PL2. Since
the CA1524 contains a 5V internal regulator and a wide
operating range of 8V to 40V, a single 9V battery can power
the total system. The two plates, PL1 and PL2, are driven
with opposite phase signals (frequency held constant but
duty cycle may change) from the pulse-width modulator lC
(CA1524). The sensor, S, is located between the two plates.
Plates PL1, S and PL2 form an effective capacitance bridge-
type divider network. As plate S is moved according to the
object’s weight, a change in capacitance is noted between
PL1, S and PL2. This change is reflected as a voltage to the
ac amplifier (CA3160). At the null position the signals from
PL1 and PL2 as detected by S are equal in amplitude, but
opposite in phase. As S is driven by the scale mechanism
down toward PL2, the signal at S becomes greater. The
CA3160 ac amplifier provides a buffer for the small signal
change noted at S. The output of the CA3160 is converted to
a dc voltage by a peak-to-peak detector. A peak-to-peak
detector is needed, since the duty cycle of the sampled
waveform is subject to change. The detector output is filtered
further and displayed via the CA3161E and CA3162E digital
readout system, indicating the weight on the scale.
FIGURE 24. BASIC DIGITAL READOUT SCALE
FIGURE 25. SCHEMATIC DIAGRAM OF DIGITAL READOUT SCALE (CONT’D)
OSCILLATOR
≈
20KHz
(PART OF CA1524)
PL1
PL2
S
AC
AMP
CA3130
COUPLED TO
MECHANICAL
SCALE MECHANISM
PEAK TO PEAK
DETECTOR
LOW PASS
FILTER
DISPLAY DRIVE
(PART OF CA1524)
DIGITAL METER
AND DISPLAY
FULL SCALE
NO WEIGHT
DC
VOLTAGE
13
12
11
10
9
15
14
16
15
2
6
1
7
2
1
13
7
CA3161E
CA3162E
8
3
4
3
5
16
MSD
NSD
LSD
+5V
COMMON-
ANODE LED
DISPLAYS
(NOTE 1)
11
10
POWER 2N2907
OR EQUIVALENT
BCD
OUTPUTS
DIGIT
DRIVERS
8
12 14
9
0.1
μ
F
10K
0.27
μ
F
ZERO
ADJUSTMENT
50K
2.5V
A
B
C
HIGH
LOW
INPUTS:
GAIN
ADJUSTMENT
NOTE:
1. FAIRCHILD FND507 OR EQUIVALENT
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