SG3525 Просмотр технического описания (PDF) - ON Semiconductor
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SG3525 Datasheet PDF : 10 Pages
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SG3525A
VCC
Q5
Q7
Q4
Vref
Q8
Q6
13
VC
Q9
Q10
5.0k
11, 14
Q11 Output
2.0k
Q1
Q2
Q3
Q6 Omitted
in SG3527A
5.0k
10k
10k
Clock F/F
PWM
Figure 9. Output Circuit
(1/2 Circuit Shown)
+Vsupply
Q1
To Output Filter
R1
R2
13
VC
11
A
SG3525A 14
B
GND
12
+Vsupply
R1
C1
13
VC A 11
Q1
T1
R2
SG3525A
C2
14
B
Q2
GND
R3
12
For single−ended supplies, the driver outputs are grounded.
The VC terminal is switched to ground by the totem−pole
source transistors on alternate oscillator cycles.
Figure 10. Single−Ended Supply
In conventional push−pull bipolar designs, forward base drive is
controlled by R1−R3. Rapid turn−off times for the power devices
are achieved with speed−up capacitors C1 and C2.
Figure 11. Push−Pull Configuration
+Vsupply
R1
13 11 Q1
T1
VC A
SG3525A
Q2
14
GND B
12
+Vsupply
T1
13
11
VC A
SG3525A
14
GND B
12
Q1
R1
Q2
R2
C1
T2
C2
The low source impedance of the output drivers provides
rapid charging of power FET input capacitance while
minimizing external components.
Figure 12. Driving Power FETS
Low power transformers can be driven directly by the SG3525A.
Automatic reset occurs during deadtime, when both ends of the
primary winding are switched to ground.
Figure 13. Driving Transformers in a
Half−Bridge Configuration
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