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參數(shù)資料
| 型號(hào)： | 44608P40 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller |
| 中文描述： | 很少的外部元件的可靠靈活二七二三六七六七高電壓PWM控制器 |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 266K |
| 代理商： | 44608P40 |
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MC44608
http://onsemi.com
14
The secondary reconfiguration is activated by the
P
through the switch. The dV/dt appearing on the high voltage
winding (pins 14 of the transformer) at every TMOS switch
off, produces a current spike through the series RC network
R7, C17. According to the switch position this spike is either
absorbed by the ground (switch closed) or flows into the
thyristor gate (switch open) thus firing the MCR22–6. The
closed position of the switch corresponds to the Pulsed
Mode activation. In this secondary side SMPS status the
high voltage winding (12–14) is connected through D12 and
DZ1 to the 8V low voltage secondary rail. The voltages
applied to the secondary windings 12–14, 10–11 and 6–7
(Vaux) are thus divided by ratio N12–14 / N9–8 (number of
turns of the winding 12–14 over number of turns of the
winding 9–8). In this reconfigured status all the secondary
voltages are lowered except the 8V one. The regulation
during every pulsed or burst is performed by the zener diode
DZ3 which value has to be choosen higher than the normal
mode regulation level. This working mode creates a voltage
ripple on the 8V rail which generally must be post regulated
for the microProcessor supply.
Figure 18. SMPS Pulsed Mode
The Figure 18 shows the SMPS behavior while working
in the reconfigured mode. The top curve represents the VCC
voltage (pin 6 of the MC44608). The middle curve
represents the 8V rail. The regulation is taking place at
11.68V. On the bottom curve the pin 2 voltage is shown. This
voltage represents the current sense signal. The pin 2 voltage
is the result of the 200
A current source activated during the
start–up phase and also during the working phase which
flows through the R4 resistor. The used high resolution
mode of the oscilloscope does not allow to show the
effective ton current flowing in the sensing resistor R11.
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