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SG3525A データシート(PDF) 6 Page - ON Semiconductor

部品番号 SG3525A
部品情報  Pulse Width Modulator Control Circuit
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SG3525A データシート(HTML) 6 Page - ON Semiconductor

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SG3525A
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Figure 3. Oscillator Charge Time versus RT
Figure 4. Oscillator Discharge Time versus RD
Figure 5. Error Amplifier Open Loop
Frequency Response
Figure 6. Output Saturation
Characteristics
2.0
5.0 10
20
50
100 200 500 1000 2000 5000 10,000
CHARGE TIME (
ms)
6
57
RD *
CT
RT
* RD = 0 W
0.2
0.5
1.0
2.0
5.0
10
20
50
100 200
DISCHARGE TIME (
ms)
1.0
10
100
1.0 k
10 k
100 k
1.0 M
10 M
1
2
9
CP
RZ
f, FREQUENCY (Hz)
+
RZ = 20 k
Vref
RT
CT
Sync
Discharge
GND
16
6
5
3
7
12
Q2
Q1
Q6
Q9
2.0k
2.0k
14k
Q10
Q11
5.0pF
400
mA
23k
Q4
Q7
1.0k
Q12
Q13
3.0k
250
4
Blanking
To Output
Ramp
To PWM
Q14
25k
7.4k
Q5
Q8
Q3
OSC Output
1.0k
15
Q3
VCC
9
30
Compensation
1
2
Q4
Q1
Q2
Inverting
Input
5.8V
100
mA
To PWM
Comparator
200
mA
Noninverting
Input
Figure 7. Oscillator Schematic
0.01
0.02 0.03
0.05 0.07 0.1
0.2
0.3
0.5 0.7 1.0
IO, OUTPUT SOURCE OR SINK CURRENT (A)
Sink Sat, (VOL)
Source Sat, (VC−VOH)
VCC = +20 V
TJ = +25°C
Figure 8. Error Amplifier Schematic
200
100
50
20
10
5.0
2.0
500
400
300
200
100
0
100
80
60
40
20
0
−20
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0


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