MC3405 查看數據表（PDF） - Motorola => Freescale
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MC3405 Datasheet PDF : 12 Pages
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MC3405
COMPARATOR SECTION
Figure 7. Normalized Input Offset Voltage
1.40
200
Figure 8. Input Bias Current
1.20
VCC = +15 V
VEE = Gnd
1.00
0.80
0.60
Slope Can Be Either Polarity.
0.40
–60 –40 –20 0 20 40 60 80 100 120 140
TA, AMBIENT TEMPERATURE (°C)
Figure 9. Normalized Input Offset Current
2.20
1.80
1.40
VCC = +15 V
VEE = Gnd
1.00
0.60
Slope Can Be Either Polarity.
0.20
–60 –40 –20 0 20 40 60 80 100 120 140
TA, AMBIENT TEMPERATURE (°C)
160
TA = –55°C
120
TA = +25°C
80
TA = +125°C
VEE = Gnd
40
2.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0
0
6.0 10 14
18
22
26 30
VCC, POSITIVE SUPPLY VOLTAGE (V)
Figure 10. Output Sink Current versus
Output Voltage
TA = +25°C
TA = –55°C
TA = +125°C
VCC = +15 V
VEE = Gnd
200
400
600
800
1000
VOL, OUTPUT VOLTAGE (mV)
Figure 11. Pulse Width Modulator Schematic and Waveforms
1.0 M
VCC
VC
VCC
5.0 k
10 k
2
+
3 Comp 1
–
5.0 k
1
4
+
7
6 Comp 2
–
5 11
VEE
10
+
Amp 2
–
9C
5.0 k
8
vt
300 k
R1
150 k 12
R2
+
Amp 1
14
VSW
–
13
Rf
5.0 k
Vout
VSW
(a) Oscillator Square Wave Output
VCC
VEE
Time
vt
(b) Triangle Wave and Control Voltage
VTH
VC
VTL
Time
Vout
(c) Output Pulses
VCC
VEE
VTH =
1
2
VS(1 + R2/R1) + VEE
VTL =
1
2
VS(1 – R2/R1) + VEE
Oscillator Frequency
f=
R1
4RfCR2
VS = VCC – VEE
VEE
Time
Pulse Width =
1
f
Vc – VTL
VTH – VTL
when: VTL < VC < VTH
Duty Cycle in % =
Vc – VTL
VTH – VTL
(100)
6
MOTOROLA ANALOG IC DEVICE DATA
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