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SG3526 Datasheet(PDF) 6 Page - ON Semiconductor

Part No. SG3526
Description  Pulse Width Modulation Control Circuit
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SG3526 Datasheet(HTML) 6 Page - ON Semiconductor

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SG3526
http://onsemi.com
6
Figure 8. VC Saturation Voltage as a
Function of Sink Current
Figure 9. Oscillator Period
Figure 10. Error Amplifier
Figure 11. Undervoltage Lockout
Figure 12. Pulse Processing Logic
The metering Flip−Flop is an asynchronous data latch
which suppresses high frequency oscillations by allowing
only one PWM pulse per oscillator cycle.
The memory Flip−Flop prevents double pulsing in a
push−pull configuration by remembering which output
produced the last pulse.
2.0
5.0
10
20
50
100
200
IC, SINK CURRENT (mA)
OSCILLATOR PERIOD (ms)
RD = 0 Ω
VCC
Q6
Q5
Vref
125
μA
Q3
Q4
50
μA
Q8
Q9
500
1.0k
Q2
1
+ Error
− Error
Q10
3 Compensation
Q12
Q11
Q7
50
μA
14
μA
Q1
1.0k
500
100
μA
14
μA
100
μA
100
μA
Vref
R1
1.2V
Bandgap
Reference
R2
+
To Reset
To Driver A
To Driver B
Metering
F/F
S
D
Q
Q
Q
R
S
Clock
PWM
PWM
Sync
Memory
F/F
2.5
2.0
1.5
1.0
0.5
0
200
100
50
20
10
5.0
2.0


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