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SG3527A Datasheet(PDF) 5 Page - ON Semiconductor

Part # SG3527A
Description  PULSE WIDTH MODULATOR CONTROL CIRCUITS
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SG3527A Datasheet(HTML) 5 Page - ON Semiconductor

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SG3525A SG3527A
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Oscillator Charge Time versus RT
Figure 2. Oscillator Discharge Time versus RD
Figure 3. Error Amplifier Open Loop
Frequency Response
Figure 4. Output Saturation
Characteristics (SG3525A)
2.0
5.0 10
20
50
100 200 500 1000 2000 5000 10,000
CHARGE TIME (
µs)
6
57
RD *
CT
RT
* RD = 0 Ω
0.2
0.5
1.0
2.0
5.0
10
20
50
100 200
DISCHARGE TIME (
µs)
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
µA
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
µA
To PWM
Comparator
200
µA
Noninverting
Input
Figure 5. Oscillator Schematic (SG3525A)
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 6. Error Amplifier Schematic (SG3525A)
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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