SG3525 Просмотр технического описания (PDF) - ON Semiconductor
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SG3525 Datasheet PDF : 10 Pages
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SG3525A
200
100
50
20
* RD = 0 W
10
5.0
2.0
2.0
5.0 10
6
5 RD * 7
RT
CT
20 50 100 200 500 1000 2000 5000 10,000
CHARGE TIME (ms)
Figure 3. Oscillator Charge Time versus RT
500
400
300
200
100
0
0.2 0.5 1.0 2.0 5.0 10 20
DISCHARGE TIME (ms)
50 100 200
Figure 4. Oscillator Discharge Time versus RD
100
80
60
40
20
0
−20
1.0
1
−
2
+
9
CP
RZ
RZ = 20 k
10 100 1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 5. Error Amplifier Open Loop
Frequency Response
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0.01
VCC = +20 V
TJ = +25°C
Source Sat, (VC−VOH)
Sink Sat, (VOL)
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)
Figure 6. Output Saturation
Characteristics
Vref 16
Q1
Q5 Q8
7.4k
RT 6
CT
5
3
Sync
7
Discharge
Q2
12
GND
Q3
Q6
2.0k
5.0pF
400mA
Q4
23k
Q7
1.0k
Q9
2.0k 14k
Q10
Q11
Ramp
To PWM
25k
Blanking
Q14 To Output
1.0k
Q12
Q13
3.0k
250
4
OSC Output
Figure 7. Oscillator Schematic
15
VCC
Q3
Inverting
Input
Q1
1
Noninverting
Input
2
200mA
Q4
Q2
100mA
To PWM
Comparator
5.8V 30
9 Compensation
Figure 8. Error Amplifier Schematic
http://onsemi.com
6
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