SG3527A Просмотр технического описания (PDF) - ON Semiconductor
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SG3527A Datasheet PDF : 8 Pages
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SG3525A SG3527A
Figure 1. Oscillator Charge Time versus RT
200
100
50
20
* RD = 0 Ω
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 (µs)
Figure 2. Oscillator Discharge Time versus RD
500
400
300
200
100
0
0.2 0.5 1.0 2.0 5.0 10 20
DISCHARGE TIME (µs)
50 100 200
100
80
60
40
20
0
–20
1.0
Figure 3. Error Amplifier Open Loop
Frequency Response
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 4. Output Saturation
Characteristics (SG3525A)
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 5. Oscillator Schematic (SG3525A)
Vref 16
Q1
Q5 Q8
7.4k
RT 6
CT
5
3
Sync
7
Discharge
Q2
12
Gnd
Q3
Q6
2.0k
5.0pF
400µA
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 6. Error Amplifier Schematic (SG3525A)
15
VCC
Q3
Inverting
Input
Q1
1
Noninverting
Input
2
200µA
Q4
Q2
100µA
To PWM
Comparator
5.8V 30
9 Compensation
MOTOROLA ANALOG IC DEVICE DATA
5
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