Q67000-A5069 Просмотр технического описания (PDF) - Siemens AG
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Q67000-A5069 Datasheet PDF : 22 Pages
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SPH 4692
The serial circuit and primary winding of the flyback transformer are connected in series to the input
voltage. During the switch-on period of the transistor, energy is stored in the transformer. During the
switch-off period the energy is fed to the load via the secondary winding. By varying the switch-on
time of the power transistor, the IC controls each portion of energy transferred to the secondary side
such that the output voltage remains nearly independent of load variations. The required control
information is taken from the input voltage during the switch-on period of the transistor and from a
regulation winding during the switch-off period. A new cycle will start if the transformer has
transferred the stored energy completely into the load.
In the different load ranges the switched-mode power supply (SMPS) behaves as follows:
No-load Operation
The power supply is operating in the burst mode at typical 20 to 40 kHz. The output voltage can be
a little bit higher or lower than the nominal value depending of the design of the transformer and the
resistor of the control voltage divider.
Nominal Operation
The switching frequency is reduced with increasing load and decreasing AC-voltage.
The output voltage is only dependent on the load.
Overload Point
Maximal output power is available at this point of the output characteristic.
Overload
The energy transferred per operation cycle is limited at the top. Therefore the output voltages
declines by secondary overloading.
Pin Configuration Control IC
Pin 1
Pin 2
Pin 3
Pin 4
Pin 15
Pin 16
Pin 17
Pin 18
Regulating voltage
Primary current simulation
Primary voltage detector
Ground
Push-pull output
Supply voltage
Soft-start
Zero detector
Pin Configuration Power MOSFET
Pin 5, 12
Pin 6-11
Pin 13
Pin 14
N.C.
MOSFET-Drain
MOSFET-Source
MOSFET-Gate
Semiconductor Group
2
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